5.3 Turbo 2 Bar Siemens 80 Tune Question
05-10-2012, 06:34 PM
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5.3 Turbo 2 Bar Siemens 80 Tune Question Hey Guys,
I just recently changed my injectors to siemens 80's, Base tune was done by a very reputable tuner that has fallen off the face of the earth. He said it would need some tweaking once it was running. (this was last august, i just got around to finishing the car) The car runs very well everywhere but at an idle. It is severely lean. The fuel trims eventually catch up and it is perfectly driveable other than when driving at a very light throttle is goes lean like it is entering DEFCO, but its not. I ran a log and corrected my VE table accordingly thinking I could fix it, but whatever changes I made in the VE didnt seem to help anything. When I kill the STFT and LTFT and force open loop it is so lean It will barely run. My setup is as follows. 2006 5.3 L33 2 Bar OS, 8.5-1. 80 Siemens, Single Front mount. 10 PSI.
I would appreciate it if anyone has any input as to what in the tune could be causing this. Its been years now since I have been brave enough to start hacking up a tune. I have attached my current tune and my very short log file, because it started pouring.
Thanks Again
I just recently changed my injectors to siemens 80's, Base tune was done by a very reputable tuner that has fallen off the face of the earth. He said it would need some tweaking once it was running. (this was last august, i just got around to finishing the car) The car runs very well everywhere but at an idle. It is severely lean. The fuel trims eventually catch up and it is perfectly driveable other than when driving at a very light throttle is goes lean like it is entering DEFCO, but its not. I ran a log and corrected my VE table accordingly thinking I could fix it, but whatever changes I made in the VE didnt seem to help anything. When I kill the STFT and LTFT and force open loop it is so lean It will barely run. My setup is as follows. 2006 5.3 L33 2 Bar OS, 8.5-1. 80 Siemens, Single Front mount. 10 PSI.
I would appreciate it if anyone has any input as to what in the tune could be causing this. Its been years now since I have been brave enough to start hacking up a tune. I have attached my current tune and my very short log file, because it started pouring.
Thanks Again
05-10-2012, 08:50 PM
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OK let's verify that first. The tune doesn't appear to be setup for 58psi base pressure on 80# injectors nor is it correct for a boost/vac reference setup. You can make a tune work, but it's best to start with as much good info as possible.
05-11-2012, 03:10 PM
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if you swapped injectors without adjusting anything in the tune, then you need new Injector Pulsewidth, injector offset, and injector flow rate tables. i might be forgetting one, but if the tune was good BEFORE you swapped injectors, then inputting the proper injector data should bring it back in line.
unless i'm missing something...
unless i'm missing something...
