2nd Generation EFI is nearing completion and start of production around July/August 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. We are presently drive testing the Gen2 Injection with the modified Corvair distributor to ensure it meets performance and durability standards that we require and you deserve. Due to logistical issues it will be introduced at Maggie Valley, NC Corvair Show October 2018. This setup will use the standard Corvair Throttle linkage, even for the FC.
The ECM will be set to burn between 14.4 and 14.7 fuel/air ratio at cruise……what does that mean? For the “Tree Huggers” the Corvair will finally be environmentally friendly (or at least a lot more than GM ever designed). With a smaller bore than the Gen1 system, we are also able to produce less pollutants at idle while protecting the engine and producing good performance and reliability.
Using a easily programmable ECM, users may adjust their system for more power (richer) or even take it farther (leaner) for better fuel mileage with the help of a wide band O2 sensor. A laptop is highly recommended for install and setup for a variety of reasons to include remote support.
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-700 was selected for Gen1. With the introduction of smaller components, better aftermarket computers and available after-marktet parts have made this possible.
Units will be produced using low cost production measures along with parts that are currently in production. A fully electronic, ECM controlled Corvair converted distributor will be the standard ignition of the Gen2, but DIS is still available as an option. We may offer upgraded throttle bodies for those wanting to spend extra in the future, but our initial throttle bodies will be designed for function and looks vs cost. We can build high end machined billet aluminum Throttle bodies, but this is very expensive, so initially that will not be an option.
Stock units will come with an ECM that can be programmed for your particular engine. After receiving your kit, you will select your engine from the website, download to your laptop and upload to the ECM. Your ECM tuning code will have your name/information recorded inside to program as this tune should not be shared/posted on-line with others for propitiatory reasons. This ECM can also be modified 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 for user desired engine performance.
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.
Fuel System: The fuel system for the Gen2 will use a higher pressure regulator (59 psi) to produce better atomization at the injectors. 3 Ways to fuel the injectors are available and are based on level of difficulty and price. 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 quite and easy to maintain. 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 engines injectors and maintain the proper fuel pressure. The fuel pressure regulator is also a filter and are readily available through aftermarket means. We will continue to use “mostly GM” tried and true parts that are generally available at most auto parts stores and reasonable prices.
Injectors: Injectors will be standard low profile injectors, but we have selected a 4 hole type to better atomize the fuel. Standard 1 hole injectors may be used, but not recommended.
Ignition: Kits will be offered with a factory Corvair distributor that has been modified to use the Vortec ignition module and E- coil that are readily available at all auto parts stores (These are included in the kit). This distributor arrangement will have the factory look and will not interfere with air conditioning compressors and other factory devices. The semi-electronic “ready to run” distributor is also be compatible with 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. This type of distributor can NOT be used for the Turbocharged kit due to loss of timing retard. These “Ready to Run” distributors can be modified (removing the chip board from inside) and locking the drive to prevent advance. If you want yours modified, please let us know. GM DIS will be available by special order as it requires different wiring harness/wires, parts and programming.
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 users can get by without it by adjusting idle up, but “idle control” also provides high idle to aid in the start/warm up process.
Air Cleaners: The throttle bodies are close to the same design as the factory carbs, so your linkage and air cleaners will fit the way GM intended when designed. 140 kits will need to use a “lock out” on the linkage to allow all 4 throttle bodies to open evenly.
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” engine 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.
Cores: We will need your Carburetor and distributor cores to manufacture more kits in the future. This means you will NOT get your carb and distributor back, so please don’t send us junk as I have to throw it away, wastes your shipping and you don’t get a check for your core.