This kit was designed and built with 3 major objectives:
• Increase performance, dependability, and driveability of the Corvair.
• Completely reversible
- GM Type Sensors and Parts
- User-adjustable with Laptop
- Off the shelf parts for easy repair
- TBIs that fit like the Carb originals
- Simple install and connections
Background: Fuel injection has always been costly for the Corvairs mainly because of the Port injection requires costly welding and the manufacture and use of low production parts. The Throttle body was chosen for the dependability and simplicity and uses mostly GM main-line production parts to keep the price low. The dual throttle body has been used before, but was fragmented and used a costly computer to run. EFI Temp input was always a problem for Corvairs and due to the wild temp fluctuations of the Air-Cooled engine. We build our own engine temp sensor that is unique to the Corvair engine for the ECM to control and trim the engine’s operation. We hope you find this one of the most well thought out, economical and dependable kits ever produced for the Corvair and should provide years of trouble-free service. This EFI system is a DIY system with many pre-made/adapted parts to aid you in the successful installation of your system, but it relies on your skill and knowledge or Corvairs and EFI. If you doubt your abilities, hire an installer or friend/club member to help you with this install.
Theory: Carbs and points on the Corvair and all engines of that era are a compromise. The Carbs give the best fuel mixture at only certain times due to the design. Distributors can’t compensate for Temp and use flying weights to control the timing… good, but again a compromise. Fuel Injection along with electronic timing applies the best fuel mixture and timing for that RPM, Load and Temp. Other sensors also trim the fuel and timing, but those are the basics. EFI will increase the life of your engine, reduce maintenance costs and provide years of trouble-free service.
What should I expect?: Ease of starting, good all-around performance and better fuel economy. This will not make your worn out engine a good engine. It does not fix burned valves, leaking heads, cracked pistons, etc…. its fuel injection. It maximizes the amount of fuel and spark for the best all-around performance and economy based on external factors that a traditional Carb and points can’t do. During initial cold starting the engine will run rich (emulating a choke) to aid in cold start and run.
What is the difference between the first and 2 Generation EFI. The first generation used an ECM and throttle bodies from junkyards/reman parts. The GM ECM was hacked to allow it to run the Corvair engine, but was hard to adjust by the end-user. It also used a throttle body that has a very large bore and was precisely tuned to avoid a delay at tip-in. The 2nd Generation uses an easy to configure ECM using free software and there are many forums explaining the different functions. We have reduced the number of connections, included more premade parts and less wiring for a quick install.
Just because you can does not mean you should: Fuel Injection will allow you to start the engine and drive very soon after starting, even in cold weather. Today’s engines have close tolerances which allow them to run cold without damage. The Corvair engine was never designed to nor meet designed clearances until after its warm. Yes… you can drive your vehicle immediately after cranking, but it is NOT advisable to do so until the engine has warmed and proper clearances have been obtained.
What do I need to purchase that does not come with the kit?
- Internal Fuel Pump (external not recommended, but will work) w/connection
- 5/16″ Fuel return line from Fuel Pressure Regulator (FPR) to tank filler neck
- High-pressure rubber hose between engine and car fuel line
- Misc Bolts/Screws to meet customer desire
- Laptop (Optional, but highly recommended)
Early Model (EM) vs Late Model (LM): 61-63 EM and low HP 64’s did not come with a Harmonic Balancer (HB). When a harmonic balancer is used, you must also switch the rear engine mount to a 64 model for the belt to have sufficient space for a fan belt change. The timing wheel/harmonic balancer combination will not fit on the FC unless modified
Brown EFI will work on all Corvair engines that use a bolt-on carburetor. The ignition system uses the distributor and coil configuration for all engines. Smart DIS is available on a special order basis only. The ECM is easily adjustable using a laptop and provided cable to match users’ performance objectives.