It had an R33 motor in it, and after an oil pump problem, it was replaced with an R34 engine.
Pardon my ignorance, but what is the tps? As you can tell from my profile (and pic), I drive a Soarer. He hasn't got Internet access.
We are aware that it shouyld not have any torque going to the front wheels under the conditions that you describe. That is the problem. It's getting too much torque to the front wheels. When it is driven hard, the sterring wheel is just about being riped out of his hand.
Wheels are the same.
The surge and the torque split problem are one in the same.
A friend of mine has a Stagea (GTR wagon) and after putting a new (R34) engine in it, it has developed a surge (from driveline) at light throttle (cruise). At the same time, it is giving too much drive (according to the torque split gauge) to the front wheels. Seems like it thinks the rear whells are spinning.