hi guys, i have a 2005 hsv clubsport r8.
It runs the ls2 in it and have done long tube headers, full stainless exhaust, OTR intake, has a large cam, valve springs, lifters, pushrods etc, factory ecu and fuel system. About 580hp.
The car had been running fine for 4 months since it came back from the dyno the first time but then one day i noticed it to be running pretty shit, so i put the laptop back on it and noticed the the stft were getting up in the 30s and and ltft were getting up to 20. i added more fuel into it but had to put mass amounts in to drop the fuel trims and then next time i drove it the fuel trims were right back up. every time i add more fuel into it nothing happens and continues to run lean.
Since this issue has started i have and the injectors checked and cleaned, new fuel filter, checked fuel pressure (60psi), new o2 sensors, checked for vaccum leak, charge battery and check voltage from alternator and check all earths i can find.
When the car came back from the dyno the first time the injector duty cycle was 88% at full throttle and now its 99% and running very lean, but the fuel trims are highest at around 3000rpm+ which is where the cam starts to turn on.
I really need help as i have spent weeks tryna figure this out.
Any ideas guys? thanks, mitch.