The Rtek7 ECU Upgrade v1.5 for S4 Turbo II cars does five things:
- Eliminates Fuel Cut ("FCD")
- Eliminates the Accelerated Warm-up System
- Lowers the RPM at which the secondary injectors come on to 3500 RPM
- Increases the primary injector capacity by 5%
- Retards timing ~1 degree per PSI above 9 PSI
Built in Fuel Cut Defenser (FCD):
The stock ECU will cut fuel to the rear rotor when boost hits the fuel cut threshold of about 8.6 psi. Although this was put into the stock ECU as a protection mechanism, it's a quite harsh mechanism and not required for mild improvements in boost.
The Rtek7 goes right to the source by removing the code responsible for Fuel Cut from the ECU altogether. This has the additional benefits over external FCDs in that it doesn't alter the boost signal to the in-dash gauge, there are no wires to splice, and no additional box to clutter the engine bay.
RUNNING TOO MUCH BOOST WITHOUT ENOUGH FUEL CAN DESTROY AN ENGINE. EVEN THOUGH THE FCD IS BUILT INTO THE ECU, IT IS THE CUSTOMER'S RESPONSIBILITY TO ADDRESS FUEL REQUIREMENTS SEPARATELY.
When you first start your RX7, the ECU will rev the engine to approximately 3000 RPM's - this is the Accelerated Warm-up System (AWS) in action. The purpose of the AWS is to warm up the precat. Of course, one of the worst things you can do to a cold engine is high revs. This mod removes the AWS code from the ECU allowing your car to idle normally when cold.
Lower secondary injection point to 3500:
Normally the secondary injectors start adding fuel at 3800 RPM. The problem is that the secondary injectors will not come on below this rpm regardless of the boost being run. This can lead to cars running lean below 3800rpm even if they have larger injectors, fuel pump etc. Lowering the RPM at which the secondary injectors come on allows them to add fuel before the primary injectors start to max out.
Increase primary injector duty cycle cap by ~5%:
Raising the cap allows a little bit more out of the primary injectors. This works in conjunction with the lower Secondary Injection RPM to smooth out air/fuel ratio and get rid of the lean spot.
Timing retard above 9psi:
The stock ECU has no additional timing control for above around 9-10psi. This mod extends the timing control to give a little more safety for those running 9+ psi. Timing is pulled about one degree per PSI.
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