Quote:
Originally Posted by
scdyne
There are a few -limited- features that can be adjusted in the ECU to partly address this, but the bottom line is that it requires the reprogram of the TCU to take care of it. The problem is that no tuning software is available for the TCU for any year kappa at this time.
One thing that can help a little in the ECU is the rpm acceleration rate and possibly bumping up the neutral and park rev limit from 4000 to 5000.
If you notice under no load and a slow throttle up to rpm it will go all the way to 4000 and stop, but if you slam it you'll find it hit an almost random limiter anywhere from 2000 to 3000.
There is Map called Rev Limiter Accel Modifier that lowers the Rev Limiter values by the amount defined in the table corresponding to the acceleration rate of the engine RPM.
Moving that can help with rpm ramp rate, but the transmission will still take its time locking up the torque converter clutch, which makes the car feel like nothing is happening.
However this requires a tune and a less expensive solution would be to use the PRNDL selector as an almost manual stick and put it in I mode when you want quick shifts and aggressive response from the transmission. I shift the heck out of my automatic and feel that it offers 90% of the performance I expect, you just have to remember to slam it into I if you want to fast pass someone or pull out into traffic.
This is some very good info. Thanks! So there is no tuning anywhere for the Kappa auto
tranny? Is there anything coming down the pike? I'm not trying to build a drag car, but
it would be nice to stomp on the throttle from a dead stop and have it fire out of the hole.
It just needs to get some torque to the ground instantly. I would say if I could get the revs up with the brake on up to about 5000 or so
I could launch dam good.