PCM Diagnostics & Tuning - part throttle tune for friends car, need advice
05-09-2006, 11:09 AM
I have a friend of mine that wants me to tune his car for part throttle because his car is dumping too much fuel. He has a 2000 Trans Am A4 mods are ls6 bottom end, ls6 intake, slp lid and maf, headers, full exhaust, 4.56 gears, 3200 custom stall. He also has a nitrous cam but he just wants me to tune his car for idle and for part throttle for daily driving. What tables should I change on his car to tune his idle and part throttle without affecting full throttle? I have HP tuners with a wideband if that helps. He doesn't want me to mess with shift points since he says he shifts it manually.
05-09-2006, 11:26 AM
It should've been able to adjust on its own unless something is wrong.
I'd suspect the aftermarket MAF maybe causing the problem.
What happens if you swap to stock MAF? what about no MAF at all?
The normal fueling tables to tune for idle & PT would be the VE and the MAF tables.
Before you assume way too much fuel is going in, see what your WBO2 tells you.
05-09-2006, 11:49 AM
Yes he does have stock injectors and stock fuel pump as well. I don't know what would happen if we changed the maf. With the wide band which histograms will I have to go off of for ve and maf tables? Will I have to disable the maf in order to do those? He also wants me do delete codes for egr and rear o2's, which codes are they?
05-09-2006, 11:56 AM
It's much easier to switch to SD mode to get the VE table correct first.
I wouldn't do it any other way.
05-09-2006, 12:10 PM
No Cats = More Exhaust/Fuel Smell
05-09-2006, 08:22 PM
Your lower load in the 40 to 70 kpa ranges will need to be addressed in the VE table to fix your friends problem. As the gentleman above said make sure all of the vehicles sensors are functioning properly before adjusting any table in the ECU. Higher numbers equate to more fuel and lower numbers equate to less fuel. This is much easier to accomplish on a good load bearing chassis dyno. Know what your target values are in the cells you are adjusting and keep making changes until your actual A/F matches up with your target.
Good luck my friend
Chris Macellaro :)
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