Originally posted by jeffreylin
1. Does anyone know if the rear diff setup differs from shaft to belt? I run 10k (stock setup) rear diff with a front one-way on my FW-05R and it works great. However, most of the other guys running MTX-3 and V1 runs 30k rear diff oil. I tried 30k and the car was undriveable (pushes offpower and fishtails on power).
2. How does the TCD gear set work on the V1? I tried it on the FW and the car again is undriveable. It oversteers going into the corner and loose while on power. It's even worse than the 30k rear.
jeffreylin, I used to run 30k, I switched back to 10K. But I'm running the spool in front so I needed a looser rear. It all depends on your driving style. I switched mine up and like the 10K better. Our track takes a while for traction to set in, so looser is better.
As far as TCD gears go, same think, I went back to the stock gears. They kind of paddle throught the lube more than the stock and this helps keep the rear diff stiffer which works wonders on larger tracks with fast turns. But I got the same handling characteristics from running heavier oil in a stock diff case.
I used to run the Kawahara Neg. Diff in my RR. I seemed to work OK, but I got faster lap times and held better lines with, again, the stock diff case. I think it's down fall was the heavy alum. diff. case. It carried too much weight around the turns, which made my rear end fish a little.
This is all through my own experience in the last 2.5 yr racing the RR and Evo. But in my opinion, save your money for tires.