donkey

well here we go.....nissan gtr r33 power fc. problem is when driving car holding a constant speed, car starts surging, then the backfiring (changing gear first and second) puff black smoke, black carbon deposits over back of car.....obviously running rich, because fouling plugs. i live in queenstown (nz) so air pretty thin up here in summer, car runs sweet in winter (colder air, more denser) but when summer hits problem starts, car was dunno tuned in auckland (sea level), had a wrx, link computer that was also dyno in auckland then brought down here, same problem, dont really want to lean out mixture.......any ideas on my theory???.....cheers

hey, ive got bridgestone SO3 potenzza's on my r33 gtr, they are 285/30/18, my car tracks alot (when driving along the road the car will follow the road camber) which can be quite scarey when cornering, driving fast etc, the idiots at the tyre shop put some 255's on the front which fixed the tracking problem, but they put on 40 series tyre which has mucked up my tourqe split (it goes into 4 wheel drive briefly on take-off, even when driving slow) you can not buy a tyre with the same rolling diameter in a 255 (they are 6mm taller in the 30 series) from any tyre company.....and if anyone knows how to fix the tourqe split problem???? apparently bleeding it???? cheers