I am running the 034efi with 30lbs accell injectors and stock primaries. I going to be running 12-15 psi, right now i only gone as high as 9 with a manual boost controller.


Problem
I have been test driving the car with the datalogger connected. I am looking at Short and Long term fuel trims and trying to adjust the 034efi injector scaler. Problem is as soon as i start to boost, really as soon as i read near atmospheric pressure i read highly negative long and short term trims (sometimes they will even go to -25 for both or close to it) but they will then both drop to 0% and remain there as long as i am in boost. This all happens below 75% throttle and in what should be closed loop

During all this time i have never seen dangerous EGTs or air/fuel readings. My have been playing with the injector scaler. I have had it set around 6 i have tried a little lower and a little higher.

I have the 034efi pushing fuel just below atmosperic pressure, so i am not really surprised to see the computer trying to cut fuel like it is but my concern is why is it going to 0% right after that?

Any help?
Am i going into open loop for some reason?

Originally posted by disturbingvenger
I am running the 034efi with 30lbs accell injectors and stock primaries. I going to be running 12-15 psi, right now i only gone as high as 9 with a manual boost controller. Problem I have been test driving the car with the datalogger connected. I am looking at Short and Long term fuel trims and trying to adjust the 034efi injector scaler. Problem is as soon as i start to boost, really as soon as i read near atmospheric pressure i read highly negative long and short term trims (sometimes they will even go to -25 for both or close to it) but they will then both drop to 0% and remain there as long as i am in boost. This all happens below 75% throttle and in what should be closed loop During all this time i have never seen dangerous EGTs or air/fuel readings. My have been playing with the injector scaler. I have had it set around 6 i have tried a little lower and a little higher. I have the 034efi pushing fuel just below atmosperic pressure, so i am not really surprised to see the computer trying to cut fuel like it is but my concern is why is it going to 0% right after that? Any help? Am i going into open loop for some reason?

Well I just got my setup done, using the same injects you are. I have a very basic tune done, and its still really rich, but my scaler is around 6.750. It starts to fuel around 92 kpa, and my cut rate is around 25. Decent transition into boost. I also have cut fuel in the first horizontal grid, the one between 105 and 137 kpa(approx 0-5 psi). Most of them are around .80 in that matrix grid. But to more answer your question, it goes to 0% because you are going into open loop, and your map is also seeing WOT voltages. If you can keep it in closed loop, you should still be able to view your STFT..