C6 Tuning




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For the LS2 (Atleast on my GTO), all you needed to do was tune WOT and it'd be done. The Long Term Fuel Trims would not really transfer to WOT much, infact it wouldn't transfer at all unless your tune was pretty far off in normal driving.
With the LS3, you need to tune both part throttle and then WOT. The reason why is the LS3 loves to use the LTFTs everywhere. In stock form my LTFT at WOT was subtracting like 9% fuel
, and it would fluxuate too. So when I first tuned it for WOT it was perfectly fine, but once I enabled closed loop suddenly my AFR jumped from a 12.4 to a 13.2+. To combat this I went back, tuned normal driving first so at WOT the LTFTs would be as close to 0% as possible. Then I tuned WOT while filtering out any reading when the car wasn't at WOT.
I only tell you this because if a tuner overlooks the Part throttle tuning in the LS3, it could mean some serious damage to your engine, especially when the spark is bumped up pretty high.
Speaking of Cartek, they recently tuned an APS TT equipped C5 with a Cartek built forged 346ci and it made over 900rwhp.
The owner simply hopped in and drove it home after that.
For the LS2 (Atleast on my GTO), all you needed to do was tune WOT and it'd be done. The Long Term Fuel Trims would not really transfer to WOT much, infact it wouldn't transfer at all unless your tune was pretty far off in normal driving.
With the LS3, you need to tune both part throttle and then WOT. The reason why is the LS3 loves to use the LTFTs everywhere. In stock form my LTFT at WOT was subtracting like 9% fuel
, and it would fluxuate too. So when I first tuned it for WOT it was perfectly fine, but once I enabled closed loop suddenly my AFR jumped from a 12.4 to a 13.2+. To combat this I went back, tuned normal driving first so at WOT the LTFTs would be as close to 0% as possible. Then I tuned WOT while filtering out any reading when the car wasn't at WOT.
I only tell you this because if a tuner overlooks the Part throttle tuning in the LS3, it could mean some serious damage to your engine, especially when the spark is bumped up pretty high.
Not true, a tune properly done takes the same amount of time given both cars are similar in mods. A good tune will also have a full calibration done on your fueling tables, not a half *** attempt to dial in only some parts of it. I also personally prefer a street tune, but I won't go in to that. $750 is way to high either way. Also, I believe the new PCMs have fuel trims (-) at WOT but they are not actually doing anything (the code is broken and they end up no where, IIRC)
Last edited by WS6FirebirdTA00; Apr 2, 2008 at 03:13 PM.
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