Well I figured since I have HPTuners I'd give tuning a shot on the 03 SSS I just picked up. The truck is bone stock other than a Vararam CAI and a Magnaflow muffler. Starting off I just wanted to adjust tire size, remove the speed limiter and reduce the amount of both engine and transmission torque management. I went out and logged the truck on the stock tune before messing with anything and at WOT I was seeing upwards of 8* of KR which I thought was kind of crazy for a pretty much completely stock truck.
Went back to the house and saved the log and pulled the stock tune, saved a copy of it and started working on the torque management and speed limiter. I followed some simple instructions I found on the HPT forum to remove all torque management, but used my own values to reduce it by 75%. Then uploaded the new tune file and went out for another log. This time I saw no KR at all at WOT, the shift from 1-2 felt a bit sluggish but I know I'm going to have to either add a vette servo or some more tuning work to fix that issue. But overall, the truck felt like it pulled much stronger than before. I also noticed though that with the stock tune, the commanded AFR was 14.68, but with my modified tune the value for commanded AFR was gone in the scanner.
Now, I don't know if something that I modified in the engine torque management is the culprit for the missing AFR value or not, because other than clearing codes, shutting off rear O2s or loading in a custom tune, this is the first time I have ever messed with HPT on my own. For peace of mind until I got some insight from someone more knowledgeable, I loaded the factory tune back in the truck before going to bed last night and kept my foot out of it on the way to work this morning. I did have a few instances passing other cars on the highway at about 1/2-3/4 throttle that I saw about 2* of KR this morning however so Id like to try and figure that issue out along with making sure my values for torque management are acceptable for a stock trans.
Thanks in advance!