I dont feel this is a good question aiming directly as a question for HPTuners since it is not a known tunable table, but I do have a question that hopefully a tuning guru or pcm hex expert can shed some light on. I mainly tune GM 3800 equipped cars stock to wildly modded and have read about and personnally experienced that if the maf signal is too low than the auto trans line pressure is also low and causes the trans to slip and even mis the shift and hit the rev limiter. I know this is not a table on HPT or any other tuner to my knowledge, but does anyone what know how exactly one is related to the other?? Is there a certain point of maf reading that from XXX and higher airflow it is just max commanded line pressure or is it a scaled line that gradually gives more line pressure with more airflow? For example, and my first experience on my own car, I made some changes to my intake setup and my car was running very lean and my trans was slipping so bad at WOT that I was hitting the rev limiter 400 rpm higher than my commanded shifts. Well some engine carnage followed and after investigating the problem I found my MAF readings very low because of the intake changes I had made. After retuning the car and altering my maf readings the trans shifted firm and right on the money like it always previously had. It seems like any lower than 30 lb/hr on the maf scale and the trans pressure is nowhere near where it should be and the trans slips at WOT. Rescaling things and getting the maf numbers up to around the 40 lb/hr range seems to make a very substantial difference. Again these are 3800 cars f-body and w-body and I dont know that this applies to the V8 cars but I would imagine it does. Does anyone have a good answer or has broken down some code in the pcm to actually find or look at a table such as this if one exists? With absolutely no other change to the car, or any other car for that matter, the maf readings directly effect line pressure and I would really be interested in the hows and whys if anyone can help. Thanks for all those who took the time to read this and can share some knowledge to clear up this gray area I stumbled upon.
Dave