If your car is a V8 auto AU and you have changed diff gears forget it the problem is in the
ECU and can not be fixed yet. Although if its a factory diff ratio you have changed to eg 3.45 find a xr8
ecu and you will get away with it a bit more cleanly.
Chiptorque and SCT are working on a way to tap into the torque reduction maps in the
ecu. Which is the cause of the problem.
An after market computer wont help you because as far as we are aware there isnt one that can control the elec autos in the au's. And the Auto portion of the au computer can request torque reduction as well.
I went from 3.45:1 to 3.9's and with no traction problems had absolutely no gain on the 60ft, or on the et. And it felt no different on road
Datalogging on the dyno shows the
ecu is pulling up to 19degrees timing out from the torque maps requesting torque reduction.
I run 97mph on the 1/4 with no traction loss in a AU 2 xr8 ute which is good for a low 14 but can only get a best of 14.89 (approx) (the guys with 2031/2030 cams in the same car with stock gears run a slightly slower mph)
A stall convertor wont get you past the bottom end problem either as it affects the whole rpm range. (Noddy's car still has the issue with a aftermarket stall)
Headsex can vouch for this problem (sct tester)
Noddy's T3 has also been datalogged (auto/stall/3.7's)
I've got slips from willowbank + chiptorque's data logging & AU2xlsv8 will vouch for all of my runs on the 1/4 as for the no traction loss.
---- if none of this apply's to your case just ignore me.