Trouble with my tune
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Joined: Aug 2021
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Trouble with my tune I have an 04 GTO with a d1sc procharger, it has a 4.13 pulley kooks long tube headers, stage 2.5 243 heads 60#hr injectors and a walbro 265lh fuel pump
I have been trying to reduce fuel since Ive gotten the car as it tries to idle at 9.5 afr, and I cannot get it to change at all.
I have replaced the MAF, and MAP sensor, both down stream oxygen sensors, added a wideband, and am currently data logging it with the hptuner, I have tuned the MAF and checked for knock, and still cant get it to lean out for nothing. I know everyone is going to ask for my tune so that it can be reviewed so Ill attempt to get it on here tonight. Any help would be greatly appreciated.
I have been trying to reduce fuel since Ive gotten the car as it tries to idle at 9.5 afr, and I cannot get it to change at all.
I have replaced the MAF, and MAP sensor, both down stream oxygen sensors, added a wideband, and am currently data logging it with the hptuner, I have tuned the MAF and checked for knock, and still cant get it to lean out for nothing. I know everyone is going to ask for my tune so that it can be reviewed so Ill attempt to get it on here tonight. Any help would be greatly appreciated.
Looks like you have a lot of base cal prep work to do on this. Getting a 2 bar MAP, increasing MAF size so it doesn't saturate or running the 2 bar OS and potentially tightening up the exhaust to seal up leaks, among other things. Your bank 2 rear O2 also responds almost as if it's behind a catalyst - does it have catalysts? If so, that'll have an impact on how useful the wideband data is (it's not). Lots of questions...
Thread Starter
Registered User
Joined: Aug 2021
Posts: 3
Likes: 0
Looks like you have a lot of base cal prep work to do on this. Getting a 2 bar MAP, increasing MAF size so it doesn't saturate or running the 2 bar OS and potentially tightening up the exhaust to seal up leaks, among other things. Your bank 2 rear O2 also responds almost as if it's behind a catalyst - does it have catalysts? If so, that'll have an impact on how useful the wideband data is (it's not). Lots of questions...
