2nd Gen EFI Systems

2nd Generation EFI is nearing completion and start of production around July 2018.  After years of producing the GM TBI system, most of the parts have almost been used up and we are nearing the end of 1st generation EFI.  We will still support 1st Gen TBI as we will continue to sell them until throttle bodies are no longer available.

You end up where you started:  The second generation EFI looks very similar to some of the prototype versions that we ran before the GM TBI was selected.  With the intoduction smaller components, better aftermarket computers and parts have made this possible.

Units will be produced using low cost production measures along with parts that are currently in production.  DIS will be the mainstay ignition system of the 2nd gen as the first, but the Emerson Distributor can be incorporated into the system with minor software and wiring changes.

Units will come with an ECM that is pre-programmed for size engine, but can be changed if needed due to special cams or other changes to the running of an engine.  Users will be able, with a laptop, change their own tunes and performance of the engine.

Do I need to upgrade from Gen1 to Gen2:  No, but I can see if you have a 140 there may be some advantage to having 4 TBIs sending fuel in air equally into the fuel log.  The Gen1 TBIs have a larger bore and may produce more power, but don’t have the Corvair look as the Gen2  The smaller bore may improve idle and “tip in”.  Other than having a more Corvair looking air cleaner system and linkage, the Gen1 models are proven to last “almost forever” and require little to no maintenance.  For a 3.0/3.1L engine, I could not see a better setup than the Gen1 TBI setup.

Fuel System:  The fuel system for the Gen2 will also change they recommended way we inject the Corvair.  External pumps configuration will use a low pressure pump (outside the tank) to “siphon and pump” fuel to the 2nd high pressure pump located behind the engine compartment.  This will allow external pumps to be used that are quit.  Internal pumps are always the best for durability and noise, but do present a challenge in case of failure or needed repair to other items.   Fuel pumps WILL NOT be included in any kits due to warranty and repair reasons.   A fuel pressure regulator and filter will be provided to protect the engine and maintain the proper fuel pressure.  The fuel injectors will be readily available through aftermarket means and we will continue to use “mostly GM” tried and true parts that are generally available at most auto parts stores.

Ignition:  Kits will be offered with standard DIS, but we are working on giving a choice of DIS or semi-electronic distributor in the Gen2 Kits.  This type of  distributor is a self contained electronic “ready to run” billet distributor, but timing will not be controlled by the ECM as with DIS.  These distributors are manufactured by Top Speed Performance (TSP) and sold by TSP, Seth Emerson, Amazon and others and I am still trying to negotiate a price that will keep the kits in the same general range as DIS.   This pretty much rules out distributors for the Turbocharged kit due to loss of timing retard.  What does this really mean?  The distributor will be “HEI” which will means tons of extra spark, but timing will be controlled by weights and vacuum (like stock), not ECM signals.  In the future, we plan to offer a Corvair distributor that has been converted to “Fully Electronic” that can provide timing control.


Idle Control:  These kits do not have integral idle control built into the TBI as the Gen1 kits, but an add-on item is available for PG/AC models and is being designed to be cost efficient.  Most manual transmission users can get by without it, but “idle control” also provides high idle during the warm up process.

Warm up:  One of the concerns about this design is that the vehicle can be driven immediately after starting, which sounds good on the outside, but the Corvair engine was never designed to drive until the engine has had sufficient time to warm and “fill” clearances.   Engine tins and flaps should be in place to ensure engine get to temperature a quickly as possible with the minimum amount of load to promote long engine life.

2 Throttle body:

4 Throttle Body: