99 FRC Tuners PLEASE Step in!!!
10-09-2006, 06:29 PM
#1
99 FRC Tuners PLEASE Step in!!! Ok so heres the deal...
My 99 is supercharged with 9psi of boost. I had it tuned with 42# injectors and the injectors were maxed out at 116% Duty Cycle. So I bought some 57# Injectors and have had a lot of trouble since then.
I finally got a decent tune on it with the new injectors and decided to go with some Long Tube headers from DRM. Again all hell has broke loose. 
I have tried everything from open loop SD, to going back to a stock tune with the IFR change. The car runs 17-18:1 lean for some strange reason. If you give it a bit of throttle real quick it will go to 15:1 but if you hold it, it goes lean off the charts again. It has a hard time idling and pops a lot. Does anyone have a clue as to what may be the problem? Thanks!
My 99 is supercharged with 9psi of boost. I had it tuned with 42# injectors and the injectors were maxed out at 116% Duty Cycle. So I bought some 57# Injectors and have had a lot of trouble since then.
I finally got a decent tune on it with the new injectors and decided to go with some Long Tube headers from DRM. Again all hell has broke loose. I have tried everything from open loop SD, to going back to a stock tune with the IFR change. The car runs 17-18:1 lean for some strange reason. If you give it a bit of throttle real quick it will go to 15:1 but if you hold it, it goes lean off the charts again. It has a hard time idling and pops a lot. Does anyone have a clue as to what may be the problem? Thanks! 
10-11-2006, 10:20 PM
#2
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Offhand, I'd say it's the tune. 
Seriously, there's allot of stuff it could be...from incorrect IFR table settings, VE issues, to plain old air leaks.
Provide a few more details, such as Fuel trim values at idle, O2 readings, MAP value, etc. and we may be able to help a bit more.
Seriously, there's allot of stuff it could be...from incorrect IFR table settings, VE issues, to plain old air leaks.
Provide a few more details, such as Fuel trim values at idle, O2 readings, MAP value, etc. and we may be able to help a bit more.
