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I have an R33 GTR ECU, which runs the car extremely rich - 10.2-10.5 afr at idle. I tried swapping out the ECU and used an R32 GTR ECU and the car started running extremely lean - 17.4-18 at idle. Confused as to why that would be. The car is stock, with stock injectors and MAFs. The only upgrade is the LS2 coils. TPS voltage checked out.
The car came with R33 GTR ECU installed with some piggy-back Jap **** called VACS (Variable Airflow Control System). I find it stupid, so decided to disconnect it, but as soon as I disconnect it, the stock ECU sends the afrs to under 11 at idle. what is really throwing me off is the two extremes between the two ECUs. I ave already fixed the O2 sensor ground issue on the R32 GTR ECU to make it run the R33, so that is not the problem.
If anyone has any ideas or suggestions, please help. I appreciate it.
The car came with R33 GTR ECU installed with some piggy-back Jap **** called VACS (Variable Airflow Control System). I find it stupid, so decided to disconnect it, but as soon as I disconnect it, the stock ECU sends the afrs to under 11 at idle. what is really throwing me off is the two extremes between the two ECUs. I ave already fixed the O2 sensor ground issue on the R32 GTR ECU to make it run the R33, so that is not the problem.
If anyone has any ideas or suggestions, please help. I appreciate it.