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Last Update: May 5/21
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Due to the vast size of this site, it's sometimes hard to find what you want so here are some tips and links for aircraft specific things:
Search tip- Use the CONTROL F command to help locate certain words on that page.
For more information on EFI for specific engine types, click on the links below:
Lycoming 4 Cylinder
Lycoming 6 Cylinder
Continental 4 Cylinder
Continental 6 Cylinder
System Options Explained
On Nov. 29, 2019 we delivered our 2000th aviation EFI ECU. We believe this is more programmable ECUs than all other brands combined in the Experimental market.
We currently offer 3 basic electronic products for Experimental aviation:
1. CPI. This is a low cost, lightweight, user programmable ignition-only product intended to replace magnetos and other legacy EIs on Lycoming, Continental, Rotax and Jabiru engines. More info here: CPI
2. CPI-2. This is a user programmable ignition-only product with smaller, panel mount display and remote mounted controller intended to replace magnetos and other legacy EIs on Lycoming, Continental, Rotax and Jabiru engines. It's an evolution of the original CPI with more features added like automatic backup battery switchover, OV protection, display dimming etc. More info here: CPI-2
3. EM-5. This is a user programmable electronic fuel injection controller or EFI plus integrated electronic ignition. Kits are available for popular aircraft engines to replace legacy carbs/ mechanical fuel injection systems and magnetos. Available in many different configurations in either single or dual redundant ECU setups. See the photo below for a typical example of the EM-5.
Basic components of dual EM-5 4F EFI aviation system for Lycoming 4 cylinder engines. No wiring shown here.
As of late 2019, we are supplying the new Design1 programmers as standard on all EM-5 aviation kits to replace the original 3 1/8 round programmers. Designed to fit above the center stack and integrate better with modern glass panels, these measure 6.25 inches wide and 1.47 inches high. LOP and programmer select functions are now integrated on the keypad as well and the fault warning LED. All EM-5 ECUs can drive these new programmers with a V30 software re-flash to the ECU(s).
Rear of programmer. One serial cable connection for each ECU board. Programmer can access either ECU board.
New programmer integrates well with modern glass panel layouts.
We also offer CNC'd products for Lycoming Experimental engines. At this time, we have lightweight flywheels, lightweight valve covers, 14 to 18mm spark plug adapters, no-leak induction flange kits and dual fuel pump modules shown further down this page.
For SDS Aero CNC'd Components
No-Leak Intake Flange Kits
For aviation documentation and manuals:
No-Leak Intake Flange Kits
EFI in the Experimental aircraft world is becoming the new "normal" today. While some people cling to 100 year old technology such as carbs, mechanical injection and magnetos, the fact is our aircraft EFI/EI can do the job better, with less pilot monitoring and less maintenance. Reduced fuel flow for the same TAS is proven on several different engine types now and there is no chance of carb ice with EFI. Mechanical controls simply cannot match the optimized control that EFI/EI offers under all flight conditions from hot start idle to low MAP/RPM at high altitude to the pylons at Reno pushing 900hp.
We have been supplying the experimental aviation market with engine management systems now for over 25 years. We offer aviation specific software and hardware for popular experimental engines and we fly what we sell. We're involved as a supplier to several kit manufactuers, engine builders and our always ongoing R&D programs.
We've provided aircraft EFI and EI systems and ECUs for BMW, 3, 4 and 6 cylinder Suzuki, Continental, Lycoming, Franklin, Jabiru, LOM, Rotax, Saturn, Subaru EJ22, EJ25, EG33, EA81, EA82, EZ30, EZ36, Rotorway, Toyota, Hirth, HKS, Honda Fit, Honda V6, Rover/ Buick, Chev/ GM, Verner, VW, Jaguar and Mazda engines. These have accumulated an estimated 750,000 flight hours on hundreds of aircraft and military UAVs all over the world in the last 2 decades. Land based systems have accumulated millions of hours of operation under widely varied and sometimes severe conditions, including the famous Baja desert races with extreme heat, pounding G forces and punishing vibration levels. We've been flying an RV6A powered by a turbocharged Subaru EJ22 engine for product development purposes now for 18 years. We were the first to have a Gold Championship win at the Reno Air Races with EFI in 2010, 2018 and 2019. We have approval with the UK LAA on the Titan T51 (Suzuki and Honda V6 engines) and RAF 2000 gyrocopters and are working with customers in the UK on additional approvals for other experimental engine/airframe combinations. In April, 2017, we won the Best Design Award at the Mojave Experimental Fly-in.
SDS ECUs have a worldwide reputation for bulletproof reliability for 25 years. Our competitors in this field offer relatively unproven hardware/software, only have a handful if any systems flying and a tiny fraction of our flight hours and manufacturing experience. Some will claim many systems flying but ALL of those were with re-branded, SDS supplied ECUs, not their's. As of Nov. 2019, we've sold over 2000 ECUs and systems for aviation applications- both civilian and military. In all markets, we've sold over 10,000 SDS electronic ignition and fuel controllers. These controllers have been real world proven in temperature extremes from -36C to +52C and have been lab tested for continued operation even after high voltage discharges directly to the ECU case. Our conformal coated circuit boards resist humidity and moisture unlike many competing products.
Racetech/SDS simply has more aviation experience with EFI on a wide variety of engine types than any other company and is the leading supplier of aftermarket EFI/EI ECUs/systems for experimental aircraft worldwide. Current R&D is now focused on aviation specific improvments for traditional air cooled aircraft engines such as Lycoming and Continental. We were the first company to manufacture dedicated, dual redundant EFI/EI ECUs, which are easily cockpit programmable, specifically designed for legacy, Experimental aircraft engines. Watch this page for the introduction of new features and products under current development.
Please be aware that there are numerous variations among engines of the same type. Some parts may not fit or may have to be modified in certain cases.
Please note that all SDS electronics operate on 12/14 volts. 28V systems must use a separate 12/14V system or a step down power supply to power the SDS and fuel pumps. We can supply these power supplies if required.
Turbo Subaru powered RV6A and RV7. Both equipped with SDS engine management systems. The yellow RV6A is our company test aircraft. 18 years and over 440 hours on it now. We take our customer safety seriously so we feel it's important to flight test SDS products ourselves before we release them for sale to you.
Video of these planes in formation
Reliability has always been our first design criteria. Along those lines, we've never used marginally rated electronic components so nothing is ever working close to temperature, voltage or current limits. This is one major reason why SDS ECUs have such a good reputation for reliability, even in harsh environments. We also keep wiring connections to a minimum. More connections and intermediate plugs simply add potential failure points. Wiring harnesses are not something which need to be removed frequently. Finally, we believe the systems must be easy to use and understand. We give you the features you need and ask for to make the engine run properly and efficiently without useless frills or complicated programming. Aircraft engines are essentially constant rpm and load devices, spending the majority of their lives at fixed power settings for long periods of time. Once a power setting is established, the injector on-time and ignition timing remains the same until power is changed. For this reason, we feel that 3D mapping offers no useful benefits, it merely complicates understanding and operating the system for most people.
We are proud to be long time Gearheads, being directly involved in aviation since the late '70s and Experimental building and flying since the late '90s. We like to see our customer projects fly because we've been down the same path and it's very satisfying to see your long hours come together into something you enjoy.
We pledge to give you the best service in this business with immediate email replies, straight facts, no BS, no evasive answers, no sales pitches, no trash talk. We'll give you the same level of service both before and after the sale. We want you to be happy with your purchase so you tell others. That's how we've been the leader in this field for over 25 years.
Andrew Findlay won the Sport Class Gold championship again in 2019. We are so proud of Andy and his team and honored that they picked SDS for their EFI and ignition control. Great guys to work with. This is our third Reno Sport Class win after the first ever EFI win back in 2010. Andy easily outdistanced the other competitors using mechanical fuel injection and other EFI brands. SDS continues to be the fastest EFI system in the world.
Racing allows us to push the limits and learn new things to improve our products. We supply many of the people racing planes at Reno and offer a racer discount program to those using SDS products at the races who display our logo. We generally have tech support available on the race weekend in September. SDS is the only EFI system to have 3 Sport Class Gold Championships.
1995: First SDS ECUs fly on Suzuki
1996: SDS flies on Continental O-200
1997: SDS flies on Lycoming O-320
1999: SDS runs on Jabiru engine
2003: SDS flies in our company RV6A demonstrator
2006: SDS introduces 3 1/8" aviation panel mount programmer
2007: SDS runs on Rotax 912 engine
2008: SDS supplies bolt on EFI kit for Rotax 912 engines
2008: Titan Aircraft selects SDS for their V6 powered T51 replicas
2010: SDS is first EFI system to win Sport Class Gold championship at Reno
2012: SDS UK LAA approval for Suzuki V6 Titan T51
2013: SDS supplies its 1000th aviation ECU
2013: SDS UK LAA approval for Subaru EJ/ RAF 2000 gyro
2014: Introduces aviation CNC'd parts line including dual fuel pump module
2015: Introduces redundant aviation ECU and dual access programmer
2015: Introduces CPI stand alone ignition system
2016: SDS UK LAA approval for Honda V6 Titan T51
2016: We introduce our own CNC'd 45 and 80MM billet throttle bodies
2016: SDS introduces world's first cockpit adjustable individual cylinder fuel trim option
2016: SDS includes ignition advance switch on EM-5 and CPI for LOP operation
2016: SDS introduces direct fuel flow output option, eliminating mechanical flow transducers
2016: We introduce direct, head mount injector bosses for PV and AV Lycoming engines
2016: We introduce baro compensation, LOP switch and new gauge mode select features
2017: Racetech/SDS wins the coveted Best Design Award at the Mojave Experimental Fly-in for the EM-5 and CPI. April 15th.
2017: We introduce bolt on EFI/EI kit for Continental O-200 engines
2017: We introduce adjustable brightness and contrast control for the panel mount programmer
2017: We introduce bolt on EFI/EI kit for Continental IO-550 engines
2018: SDS wins the Reno Sport Class Gold championship again
2019: We introduce CPI-2 ignition system
2019: SDS wins the Reno Sport Class Gold championship a 3rd time
2019: We produce new 40 and 60mm billet throttle bodies making our complete line billet
2019: We introduce the space saving Design1 aviation programmer with new features for EM-5/EM-6 ECUs
2021: We introduce FAB kits for Van's aircraft, using SDS EFI
Go-EZ Aerobatics- Kyle Fowler.
Kyle Fowler SDS Page
Maurice Castonguay's beautiful RV-9A
Marvin McGraw's immaculate RV14. Reserve Grand Champion kit homebuilt 2018 SNF. Dual EM-5 4F.
Andrew Findlay's Lancair. Dual EM-5 6F
Ray Watson's LS3 powered Moose
Murray Kester's very clean Spitfire replica. Jabiru 5100 powered.
Rusty Crawford is one of our highest time aviation SDS ECU customers (over 2000 hours).
Honda V6 powered Titan T51B replica built and owned by Ben Chester-Master in the UK. Dual SDS EM-5 6F ECUs
Dave Anders' record breaking RV4 now fitted with SDS EM-5 4D system
Jeff Ackland's LS V8 powered P85 is equipped with an SDS EM-5 8D engine management system.
Dan Kidd's LOM powered Glastar with CPI.
Steve Murray's IO-540 powered RV-10.
If you're considering an EFI or EI system for your engine, our recommendation is to evaluate all your choices in the market. There is no "best" system for everyone or every application.
We're constantly working on new ideas and new products and we test our parts extensively before releasing new items for sale.
Our Continental O-200 running with EM-5 controlling fuel and spark
Video here: https://www.youtube.com/watch?v=gmGnvOa9RsE
Starting and running up to 1800 rpm video: https://vimeo.com/221821595
WOT testing to 2400 rpm: https://vimeo.com/223383470
Short video of coil spark test:
SDS Aero Products T shirt. Logo design by Elle Nguyen, our model here. S, M, L, XL sizes available. Gray or white shirts available.
25th anniversary SDS caps
SDS Aero cap
Software version 30 is now available. This has added some code to drive the new aircraft Design1 programmers.
SMT Hall sensors with Tefzel cable for our aviation systems. Available in single or dual configurations.
Many aircraft engines have poorly designed intake manifolds with different runner lengths, different entry angles and small plenum volumes. This usually results in unequal airflow to each cylinder and therefore unequal air/fuel ratios in each cylinder. This leads to roughness and the inability to run far lean of peak, since one or more cylinders gets to the lean misfire point before the others. EGT spreads of over 200F are not uncommon. There's little you can do about it with a carb and the old fashioned way of correcting it on antiquated mechanical injection systems was with tailored nozzles but this can only work well at one rpm and power setting. Introduced in 2016, optional SDS V26-30 software allows users to trim the fuel amount +/- 20% in 1% increments to equalize all cylinders AFR and EGTs, from the cockpit, in less than 30 seconds, as shown in the photo below:
To change your AFRs in flight, check your engine monitor EGTs and call up these windows in your SDS programmer. Increment or decrement fuel trim with the +/- 1 buttons, scroll left or right to the next trim window with the < or > buttons. It's that simple and makes screwing around with changing nozzles a thing of the past. You can also trim fuel at any throttle angle, MAP or rpm so you are not stuck with an imbalance like you are with mechanical systems. LOP operation is now fully optimized for best power, smoothness and fuel economy and zero GAMI spread.
Flight testing allowed one user to get all cylinders to peak simultaneously and the engine would run smooth right to 200LOP. An 11% trim variation between leanest and richest cylinders was required.
Available for 4 and 6 cylinder engines. 6 cylinder systems require dual ECU boards for this function.
Not applicable to EM-1 to EM-4 ECUs. EM-3 through EM-4 ECUs can have an EM-5 board installed to get this capability. Older EM-5 ECUs can be upgraded to this capability for $300US starting. Simple wiring changes are required on older models to take advantage of the fuel trim software, matching ECU output pins to specific injectors.
SDS pioneered the one switch leaning and ignition advance feature back in 2016. This allows you to instantly go LOP and simultaneously advance ignition timing to optimize power and fuel economy running at lean mixtures with their slower flame speeds. Both settings are user programmable:
Fuel leaned 24%
Ignition advanced 4 degrees while LOP switch is activated. MAP protection negates this advance for safety above a user programmable point.
This has been available since 2016, SDS provides a digital fuel flow signal to input into your glass engine monitor. Eliminates mechanical flow transducers. All internal, no external boxes and accurate across the entire rpm and load range.
We can reflash earlier EM-5 ECUs to the latest version of software. Cost is $75US plus shipping. You must send your ECU in to us.
V26/30 contains options for 100 rpm increment programming (no charge to activate)and individual fuel trim control, $300 charge to activate.
V26.1/30 added to the new fuel trim capabilities, a fuel flow signal output option to emulate FlowScan/ Red Cube type fuel flow meters for glass engine monitors. This is a $100 option to activate and provide an additional pin and wire.
PC data logging can be added to your V25 to V30 equipped ECUs for $110 ($135 if you don't have the round data port hole in your ECU case). We need your ECU back to add hardware and we email the Windows software to you.
Return shipping charges apply in all cases.
Basic ECU Specs
Size- 8.5 X 4.0 X 1.0 inches/ 22 X 10 X 2.5cm
Weight- 15.8 ounces/ 450 grams (single)
Current draw at 14V- 0.04 amps (no programmer), 0.06 amps with programmer plugged in
Dimensions for dual ECU
These products do not conform to any recognized set of standards or certifications for aviation applications.
This ECU is not waterproof and will not function as designed if moisture invades the enclosure or power/ ground connections are interrupted. Failure of this unit may result in a complete loss of engine power.
Use of these products on amateur built/ experimental aircraft is at the discretion of the buyer who accepts full responsibility for any consequences resulting from its use. Since Racetech Inc. cannot control the installation, programming, application environment or use of its products, we accept no responsibility for damage, loss or personal injury resulting from the use of SDS products. By using SDS products, the user understands and accepts this.
If any user does not agree to this disclaimer, they may return the system/ parts in new condition for a full refund.
Chinese Counterfeit Parts
It's come to our attention that there are many poor quality fuel injection parts being made in China and passed off as genuine or "OE quality" parts. These include Walbro and Bosch fuel pumps, regulators, Bosch, Delphi and Denso injectors and MSD ignition components. Some of these may even have trademarked logos and PNs stamped/ printed on them and come in genuine looking packaging. These parts may not work as the stock ones do or in the case of fuel pumps, may fail in a few hours. Beware of where you buy these components!
Photo of aircraft 3 1/8 panel mount display head (backlit). With V17-29.2 software, has 4 gauge modes to display, manifold pressure, rpm, engine temperature, induction temperature, battery voltage, fuel flow, injector duty cycle, throttle position, acceleration enrichment, mixture knob position, ignition timing and O2 sensor voltage. Also displays error codes for sensor failures, check engine light feature and allows full programming of the system in flight.
Because people often want different parts or to delete some parts from kits, we cannot put every combination with pricing on our website. Please contact us so we can finalize what parts you want, wiring harness lengths, preferred terminations and shipping costs: E-mail:firstname.lastname@example.org System prices range from about $1200US for four cylinder fuel only control with no other hardware such as pumps and injectors, up to about $7800US for a 6 cylinder Lycoming system with dual ECUs, dual ignition, all hardware such as injectors, mounts, coils, plugs, adapters, wires, throttle bodies, data logging, fuel flow and fuel trim options.
To place your order, it's best to email or phone us to discuss your project as each system is custom made and tailored for each client. We'll get a list of all your details, discuss wiring lengths, colors, options etc. and then quote you. You then pay by Visa or Mastercard, wire transfer or E-transfer for Canadian customers.
To show our appreciation for the continuing support from our customers, we'll be offering free EM-6 ECU upgrades when they are available to all customers who purchased a COMPLETE aviation EM-5 system in 2018/2019/2020. For customers who have purchased a complete aviation kit (EM-5 ECUs only)prior to 2018, (including rebranded EFXX ones), we'll be offering new EM-6 ECUs at a special discounted price. The EM-6 will be the next generation SDS ECU, based on the continuing evolution of EM-1 through EM-5 ECUs going back to 1994. We hope to be done testing the 3rd quarter of 2021 with production release at the end of 2021. EM-6 (Design1) programmers have been released before the EM-6 ECUs for use on EM-5s and are available now. The programmers are not part of the free 2018-2020 upgrade but will be specially priced for those customers.
This is the new slim style programmer we call Design1, intended for glass panels with limited space to mount the round style. It's designed to mount above the center stack in the panel arch area. Size is 6.25W X 1.47H. You need about 4 inches behind the panel to mount and get the data cables turned. This incorporates the programer select and LOP function on the keypad to eliminate these external switches previously used on the EM-5 systems. Programmer is compatible with EM-5 ECUs which have been re-flashed with the latest software. The fault light on the keypad also replaces the external one previously used.
First production Design1 programmer
This is the panel cutout template for the Design1 programmer. Please note that the finished dimension shown here results in .025 clearance on all sides for hand cutting inaccuracies and powder coating thickness. For CNC cut panels, you can reduce the cutout size to 5.666 X 1.386 for a tighter fit. This will result in about .010 clearance around all sides. Remember that powder coating the panel reduces hole clearances.
While there are many automotive engined homebuilt aircraft flying with the OE computer controlling fuel and ignition successfully, many users may not be aware of some potential pitfalls of using these systems. Many OE computers can either shut off the injectors if certain things fail such as a water temperature sensor to protect the engine from a perceived or real overheating condition or go into a very low power limp home mode. Either of these scenerios mean that you are coming down in an aircraft. The designers of these automotive ECUs did not take aircraft use into account during the design phase obviously. Their considerations were likely as follows, in order of importance: 1. Reliability- keep the engine from destructing ( shut the injectors off if necessary), 2. Emissions, 3. Fuel economy, 4. Driveability, 5. Power. Fortunately modern EFI systems, sensors and ECUs are very reliable, generally speaking. Just be aware, that as on your Continental or Lycoming, anything CAN fail equally so on your automotive/EFI conversion, making you an unwilling glider pilot.
Many people have spent countless hours trying to unravel programming code on OE ECUs for use on aviation applications, to undo unsuitable code or responses or security interlocks sometimes successfully, sometimes not. Others wonder what the ECU might do when certain sensors or inputs are modified or disconnected, especially many of the tied in chassis sensors on modern systems, not to mention security and digital key interfaces. What some people have attempted to do in dozens or hundreds of hours with often unknown consequences using OE ECUs can generally be done in minutes with SDS. You know exactly what the system will do without any hidden secrets or repercussions. All automotive OE ECUs were designed to use an O2 sensor for closed loop feedback of the air/ fuel ratios at part throttle. As such, they may not be very suitable for use with leaded avgas. SDS does not require an O2 sensor at all.
People using OE automotive systems often have to use the factory car wiring harness which obviously was not designed to fit their airplane. They try to strip out wires which are not needed, lengthen this, shorten that. Usually they just have a big, stiff, heavy, ugly mess on their hands. With SDS, we build a custom length, lightweight, reliable harness for your installation from Mil Spec Tefzel. We can leave connectors off for easier firewall passage and can even provide a harness with no pins on so you can custom tailor each cable yourself.
Typical auto OE wiring harness
SDS Tefzel wiring harnesses. We can terminate or leave connectors off for tailoring lengths and easier firewall passage.
Each cable marked for sensor
Proper strain relief and insulation is imperative for reliability.
We highly recommend that all EFI harness wires be run separately from other wires which carry high current/ voltage or any type of pulsing current signals. It has been shown that wires run parallel to each other in this fashion can lead to EMI and inductance coupling which may cause ECU running problems. Generally run the EFI wires through one side of the firewall and all other wires through the other side.
The big disadvantage of EFI compared to a carb or mechanical injection and magnetos is that electrical power is required for the pump, computer, ignition and injectors. The likelihood of both the alternator and battery failing simultaneously is practically zero with standard aircraft maintenance procedures. Generally, a good battery will allow you to keep essentials powered for 20-90 minutes after an alternator failure permitting diversion to another airport. We consider proper gauges and/or warning lights to indicate an alternator failure to be very important. We have an ammeter, voltmeter, low voltage warning light and buzzer now on our RV6A and also added a backup battery in Feb. 2005.
Virtually zero maintenance, lower fuel flows due to better mixture distribution, automatic mixture control, no carb heat, no more hot start issues, smoother running, no mag checks, no live mag issues, longer engine life due to proper mixture control and less bore washing are some of the major benefits of EFI.
1. We have far more experience than any other company in this field with an unmatched track record on many different engine types including the 2010, 2018 and 2019 Sport Reno Gold Championship winners. We've produced nearly 2000 ECUs and systems for aviation to date, starting back in 1995. We constantly evolve and improve, now on our 5th generation of ECU and working on the 6th generation now.
2. Our basic designs are also used in many automotive applications so we have a huge amount more hours (millions) and customer feedback to quantify reliability than aviation-only systems.
3. We fly what we sell and the aviation market is now our primary one.
4. Our systems are designed to keep the engine running at close to full power even with multiple sensor failures unlike many other systems which may shut the engine down or OEM automotive systems which will go into a limp mode, not allowing enough power to maintain flight.
5. We have the best tech and customer support in the industry.
6. We design and build most of the parts and write all software in-house so we know everything about it.
7. Systems are individually tailored for your engine with realistic base programs and custom length wiring harnesses (either terminated or unterminated for easier installation and firewall passage). You won't struggle making wiring or trying to start your engine like with many other systems which just come in a box. We can build wiring in Tefzel or PVC. With many different airframes out there, we don't believe in Cookie-Cutter, one-size-fits-all. You should get exactly what you want.
8. We don't use El Cheapo components like some other brands pretending to be aviation quality.
9. We offer many new features that other brands don't- fuel trim, dual access programmers for dual ECUs (no unplugging cables!), PC data logging, internal fuel flow output- no external boxes to connect, CNC machined and annodized components striving for low weight with high durability.
10. We listen to customer feedback and incorporate many of these ideas to improve our products on a constant basis. Some of our competitors are selling almost the same thing as they were 5-10 years ago.
11. We are conducting R&D on a constantly ongoing basis and innovating new features and new products to improve our product capabilities and depth of product line.
12. We offer you solid, technical information on our products, not shallow sales pitches, evasive answers or BS.
13. Better value for your money- more features, higher quality, lighter weight, customized for your project.
14. We use superior materials in high stress areas like the thread -in injector mounts while our competitor uses stainless steel with 1/2 the strength and fatigue resistance of our parts.
14. Let's face it, while all components are important, the ECU is the heart of an aviation EFI/EI system. One of the other vendors will try to tell you they have a lot of systems flying but the fact is that those were ALL using rebranded SDS ECUs, programmers and crank sensors that we supplied. They were simply middle men, building on the reputation SDS established in Experimental aviation over the last 2 decades.
More detail here on the SDS advantage: http://www.sdsefi.com/adv.htm
Q. What about redundancy?
A. On twin plug engines, it is posible to retain one mag and add a fuel nozzle into the plenum as a backup. For pilots who are not comfortable with this idea, we can offer dual ECUs. The dual ECU can also be used on automotive V8 and V12 engines in a split bank configuration, with one ECU running one bank of the engine each. We treat a V8 as 2, four cylinder engines sharing a common crank and a V12 as 2, six cylinder engines sharing a common crankshaft. Each ECU would have it's own sensor suite.
Dual board aviation ECU. Weight is 1.5 lbs.
Q. How about low voltage conditions after an alternator failure?
A. The EM-5 ECU will continue to operate down to 7.3 volts as shown in the photo below when most other electronics and avionics have given up the ghost at around 9 volts
Q. What fuel system mods might my aircraft require with SDS EFI?
A. Most aircraft will require return lines to the tanks and a Duplex fuel selector with both feed and return ports as those sold by Andair.
Q. Are the aviation units any different from the automotive ones?
A. SDS was originally conceived as an automotive system so much of the electronic hardware is identical. The advantage of this compared to units developed specifically for aviation is that we have accumulated several million hours of operation due to the greater numbers in automotive service where conditions are usually more severe. Hardware differences would be things like the aviation programmer, coil packs, dual ECU box, crank sensors/ mounts are different and we have a large variety of aviation specific hardware now for popular aviation engines. Software differences include MAP calibration in inches of Mercury absolute, revised acceleration enrichment code which also improves cold starting, special programmed defaults to help minimize the effects of sensor failures, individual fuel trim and fuel flow outputs for glass engine monitors. We sell far more ECUs for aviation now than automotive so have blended all the lessons learned into all ECUs. Our strategy has always been to keep the engine running at near full power even with multiple sensor failures-especially important in aviation. As of 2015, aviation systems are now aviation specific with configurable software settings and specific hardware.
Q. What use is the mixture knob on an automatic aviation system?
A. We recommend the mixture knob be panel mounted in all aircraft to allow the pilot to make a mixture adjustment in case of certain sensor failures. This gives you independent control of the mixture from the programmer. Some pilots prefer to manually lean with the knob once cruise power is set also.
Q. How do I start to tune SDS on my aircraft?
A. All systems have a base map entered if we know your injector flow rate and engine displacement. The engine should start and idle for you first time. The mixture knob allows instant mixture adjustment +/- 50% so you can get a smooth idle right away while the engine warms up. By using a wideband air/fuel ratio meter kit which can display the AFR directly in the SDS programmer screen, you can observe and correct the AFR at each rpm point with the aircraft tied down while slowly advancing the throttle. Main programming only takes about 10 minutes for most engines. Programming for cold start can take longer as you must have the engine cold at each engine temperature to be able to observe and correct the values. 8 channel data logging to a PC is an available option.
Video showcasing some of our aviation hardwarehttps://www.youtube.com/watch?v=riaA4K2rehE
Holley 40 micron pre and post pump fuel filters with replaceable elements. 2 sizes available (small is 3.5 X 1.5", large is 4.625 X 2"). We also stock top quality Aeroquip, Earls and Goodridge fittings and hoses.
Genuine Walbro pumps, made in USA
Detail for fuel line hookup on Borla fuel pressure regulator. Made in USA.
More info click here
Racetech dual pump module. Mounts twin genuine Walbro pumps. Anodized 6061T6 body resists oxidation and corrosion, 7075T6 fittings are double O-ring sealed (genuine Viton) for ultimate strength and reliability, straight flow path without restrictive banjo fittings. Mounts drilled for AN3 bolts- unthreaded, a variety of 1/4 NPT ports available for different fuel line connections and pressure measurement, stainless steel hardware. Price $600US with pumps for up to 300hp. $655US with pumps for up to 400hp. Weight as shown is 2 pounds 11.8 oz. Supplied with 4 1/4NPT plugs. No dealer discounts on these items. This is our original design and others have copied it now. Compare our pump module to our competitor's design which puts the fuel connections under mechanical stress when mounting.
Please note that we do not tighten or seal the side pipe plugs on the pump modules. All other parts tightened and ready to go. Screws are Locktited.
Service Parts for Racetech Fuel Pump Module
-3 crush washers for pump to hex adapters- Earls 177003ERL
Filter element for older pump modules- Earls 230107ERL
O-rings for small hex adapters- Viton V75 012
O-rings for large filter hex adapter on older models- Viton V75 019
Note we use only genuine, made in USA Walbro pumps, genuine made in USA Borla regulators and US made filters and AN hardware- no cheap Chinese copies/ ripoffs. Body designed, machined and anodized in Canada. We support jobs and industry in North America as much as possible.
We can supply many individual components and kits for EFI/ EI conversions. We believe each installation is custom and will tailor systems to your individual needs. Because of the variations in airframes and parts/ installation preferences we don't publish all kit prices here. It's better to contact us via email to work out what you want and need for your particular installation. We can quote you from there. E-mail:email@example.com
50 EM-5 ECUs awaiting final testing and shipment to a military aviation customer
How good is the spark on SDS ignitions some might ask? Here's a photo of an actual, badly oiled up plug removed from an SDS equipped engine. The ignition was still firing this one consistently with no misfire.
More info here: CPI
Lycoming 320/360 ignition kit includes Magneto cover(s), single or dual Hall sensor and mount, hardware, automotive plug adapters (1/2 reach) and plugs plus drilling block, drill and tap to mount magnets into OE flywheel, panel mount kit, MSD 8.5mm wire sets and wiring harness also included (not shown). Fits engines with 8 7/16 ID flywheel only. Starts at $1120US. Wiring harnesses can be custom tailored to your needs and any items not desired can be deleted from the kit. Note, you must drill and tap your own flywheel for the triggering magnets.
Rear coil mount for 4 cylinder Lycoming engines. Mounts to magneto studs.
We have more parts currently under development for the Lycoming kits for a wider range of fitment and coil mounting options. Watch this spot and the CPI Page for more information.
Design 1 programmer in beautiful panel built by Nick Nafsinger in Texas
Screen shot from Les Kearney's G3X, RV-10. Corrected TAS 174 knots on 10 gph LOP.
Clean set of plugs from Les' RV-10 at annual
Mar. 3/21 Coil Mount Inspection. 4 Cylinder Engines with Mag Cover Mounted Coils
We've seen a couple instances of the triangular support plate crack through the hole furthest from the cover plate (left most hole in photo below). We've supplied an improved plate since Oct. 2020 as pictured below. If you find your older plate cracked, contact us for the improved part. We've also seen a few instances (all on the same engine) of cracking of the plastic coil mounting bosses. As of Nov. 2020, we've been modifying the coils as below and using an AN960-416L to spread the load over the metal bushing and plastic coil boss. We recommend older systems have the protruding plastic ring filed down flush as shown and add the washers under the Allen bolt heads at your next inspection. Be sure to blue Locktite 243 the mounting bolt threads on re-assembly.
Revised coil support plate
Original unmodified coil
Jan. 3/20 Wire Routing Warning
We've seen a couple instances where temp sensor wiring has been tie wrapped to spark plug wires. This should NEVER be done and has led to ECUs being damaged. No EFI/ EI wires should ever be touching spark plug wires. Maintain at least 1 inch clearance.
Sept. 2/19 (revised April 17/20) Setting Magnet Position
We've eliminated the need to set Magnet Position with a timing light on Lycoming engines. For engine using the dual pickup, set Primary ECU Magnet Position to 97 and Backup to 88. For single pickup installations, set it to 92.
June 25/19 Service Bulletin Regarding Possible Hall Sensor Mounting Bolt Interference With Front Case Through-Bolts
Be sure the Hall sensor bolts don't hit the case bolts inside the threaded stainless steel standoffs. If they do, place another washer under the head of the Hall sensor bolts. Additional standard and light washers are provided with the assembly for this purpose and to establish proper sensor to flywheel clearance.
June 4/19 Service Bulletin Regarding New AEM Wideband AFR Meter Sensor Selection in Programmer
On EM-5 systems using the recommended 30-0310 AEM Wideband AFR kit, be sure to select the AEM (New) setting (O2 Sensor Type) so that the correct AFRs are displayed. The defaults prior to June 1 in the ECUs, were set to the AEM Old setting which will result in richer settings than actually displayed.
April 26/19 Service Bulletin Regarding 18 to 14mm Spark Plug Adapter Installation
Due to a number of broken brass plug adapters, we've changed the procedure for installing these as follows: 1. Thread the spark plug into the adapter 2. Torque the assembly into the cylinder head using the PLUG hex to 19 ft./lbs. 3. Torque the ADAPTER further to 25 ft./lbs. Use only a thin stripe of anti-seize compound on the plug and adapter. Do not coat the threads. Although we've done multiple yield tests on the adapters torqued into a fixture and they fail at 32-35 ft./lbs., a number of people were snapping them at the originally recommended torque of 22 ft./lbs.
Feb.8/18 Service Bulletin Regarding Over Voltage Warning and Protection When Using Lithium Batteries
Due to the widespread use of Lithium batteries in aircraft now and their different characteristics compared to lead/acid AGM batteries, we now recommend that SDS users install high/ low voltage warning systems at a minimum (preferably with aural alert) and it's highly recommended that users have automatic over voltage protection (crowbar) installed when using these batteries.
Oct. 20/15 Service Bulletin Regarding Thread Sealant on Fuel Fittings
RTV (silicone) must NEVER be used to seal threaded fuel fittings. We recommend Permatex High Performance Thread Sealant for use on pipe thread fittings. This must be applied SPARINGLY to ONLY THE MALE FITTINGS, NEVER THE FEMALE ONES. Once sealant is applied, screw the fitting in until tight. Never unscrew fittings without throughly cleaning all traces of sealant from inside the fittings and threads before re-assembling as this can dislodge sealant which can clog passages further downstream leading to possible fuel starvation. Never apply sealant to joints with flat crush washers or O-rings.
Jan. 15/15 Service Bulletin Regarding Vertical Power VP-X and SDS
It has come to our attention that the VP-X electronic switching/ circuit breaker box does not use average current draw over several seconds to trip breakers like conventional thermal breakers do. It may trip during normal operation due to peak current transients over only a few milliseconds. This can lead the pulsing current of the ignition coils and injectors to trigger the breaker far below nominal current levels. We believe this could cause a serious flight safety issue and engine stoppage. Be sure to set the breaker values on the VP-X far higher than the nominal current draw on these circuits. Be aware that average current draw can increases with rpm and load so ground running may not allow complete testing of this condition if static rpm is lower than flight rpm and engine shutdown could occur in flight. Breakers are to protect the wiring, not the device. We recommend each 4 cylinder coil pack have a rating of at least 15 amps assigned when using the VP-X, each 6 cylinder coil pack at least 20 amps, 4 cylinder injector power at 15 amps, 6 cylinder at 20 amps and 8 cylinder at 25 amps. These are only recommendations, use this information at your own risk and these values should be thoroughly tested prior to flight at WOT and maximum rpm the engine will see in flight.
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Subaru vs. Lycoming (the unabridged version of the April 2005 Kitplanes article.)
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Backup Battery Considerations
Auto Aircraft Engine Tuning Guide
Lycoming Engine Tuning Guide
EFI vs. Carb
Dual 6 cylinder EM-5 wiring schematic, warning system, integrated with Garmin G3X Updated Dec. 28/20
Dual fuel pump integration with Garmin G3X
For main aero CPI installation and tuning manual click here updated Jan. 12/21
For CPI aircraft supplement guide click here updated April 7/20
Lycoming 4 cylinder magnet mounting updated Oct. 23/19
Lycoming 4 cylinder magnet mounting diagram updated Oct. 26/17
Lycoming 6 cylinder magnet mounting updated Oct. 23/19
Lycoming Tuning Guide PDF updated May 22/20
EM-5 Aero Installation/ Tuning updated May 13/20
EM-5 Ignition Manual Lycoming updated April 7/20
EM-5 Ignition Manual Generic updated July 6/19
Aviation ECU DB pinouts updated Feb. 27/18
Dual 6 cylinder supplement/ wiring updated Aug. 12/20
Wiring/ Connector Tutorials
Fusing/ switching schematic for dual ECUs (4 cylinder)
Fusing/ switching schematic for dual ECUs (6 cylinder)
O-200 Installation manual updated June 12/18
IO-550 Installation manual updated Jan. 12/19
Component current draws and breaker recommendations updated Nov. 7/17
How to mount injector bosses on intake tubes
MSD spark plug wire assembly
CPI2 programmer panel drawing updated Mar. 15/18
CPI2 installation manual updated April 20/20
CPI2 hardware installation manual updated April 7/20
CPI2 pinout list updated Nov. 7/19
Using mag switch to control coil pack through a relay (schematic)
Some useful tuning information here aimed towards Subaru installations but generally applicable to other auto conversions: Aircraft Engine Tuning Guide
Drilling Lycoming flywheel for mounting magnets
Basic programmer function, gauge modes, RPM Fuel, MAP Fuel parameters
Basic programmer function Part 2
Building your MSD plug wire set
Hall sensor and magnet window
Installing O-rings on SDS Lycoming valve covers
Explaining aviation components
Video on our SDS billet valve covers
Tutorial for drilling Airflow Systems A/C Flywheel with serpentine belt
To see all the videos on our YouTube channel, click here: https://www.youtube.com/channel/UCiyBZlgDHg2GvQfelECCGoQ
MSD Plug Wire Part Numbers
The following bulk PNs fit all coil packs:
34049 8.5mm red Superconductor wire
34615 90 degree terminal (plug and coil)
34555 90 degree coil boot
34515 90 degree plug boot
34605 straight terminal
34565 Straight boot (fits coils and plugs)
Recommended MSD plug wire crimping tool PN 35051
Pin Crimping Tool
For crimping most of the Weatherpack pins supplied with your system, you can order https://www.amazon.com/gp/product/B002CCAEJ6/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1.
Please note: our magnet mounting system for Lycoming engines is not compatible with the Sky Dynamics lightweight flywheels.
Aero Sport Power is an authorized distributor for Racetech/SDS Lycoming products
Frankenkopter supplies SDS EFI and turbo kits for Rotorway Helicopters
For all your custom hose requirements
Racetech Inc. E-mail:firstname.lastname@example.org
CLICK ON LINKS BELOW:
#5-304 Noorduyn Park
Calgary, Alberta, Canada
Phone 403-671-4015, Fax 403-453-7687
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