Originally Posted by
RacnJsn95
I'm no transmission expert, but I've always heard there is two things that will kill a transmission. Heat, and Slipping.
When stock at WOT, in my logs I can see the trans was slipping between shifts. Not much, and I assume it's probably done on purpose for "comfort" as most people won't rod these cars and probably dont want a hard shift. You can check for slip by logging the TIME OF LATEST SHIFT and comparing it to your commanded shift times in the tune. I don't know how ACCURATE the PID is, as it always seems to log in 0.025 second increments, but it can't be that far off. At the track with the stock trans tune, I was seeing about .100 to .150 of this "slip" in some gears, not all. I don't have my laptop on my, so I can't look to see how many rpms that equates to, but you get the idea. If your time of latest shift doesn't match up with your commanded shift times at WOT, odds are there is some slip, and you either need to increase the shift pressure, or decrease the shift time. I usually only change the shift times at WOT in .025 increments anyway. You'll find that you will quickly find the limits of how fast the trans can shift with the limited tables available, if you try to command the shift too fast, you will know, and you will crap your pants thinking the transmission just fell out the back of the car, but it's probably still there, back the shift time down to a safer number and slowly creep up on it. You will find that some gears can/will shift quicker than others, this seems normal. Each gear seems to have it's own limit, which is probably both a mechanical limit, but also still limited by the lack of available tables to adjust. You will also find that sometimes some gears will shift quicker than commanded. Not sure why, and not sure if it's bad, but it's obviously not slipping. Usually when this happens to me, it's only shifting 0.025 quicker than commanded, and only in certain gears. Even though the trans is computer controlled, it's still a mechanical device that can only do what it can do regardless of what the computer tells it.
Adjusting the tune won't make your hands work any quicker when trying to use the paddle shifters, but it will still shift quicker. I don't advise using the paddle shifters personally unless you're on a winding road or road course wanting to have some fun. The computer will always upshift faster than you think you can.