Micke,Micke wrote:Maurizio. To choose which diff to use you should know the rpm limit you want to use. Tire size of course. And then the power you have to determine the speed. I'd say if you don't want to rev high a TS box should be fairly OK on the ring.
The problem at the moment is that I don't have enough power for uphill (Kesselchen towards Steilstrecke). It is 4th for 90% and >5000 rpm and when I up-shift to 5th the car has no more acceleration even drops down in rpm . On the fast bits off the track I never run into the limiter in 5 th (I chicken out or am not fast enough )
And there are some corners now I could go back to 2nd gear but normally I don't, I only use 3,4,and 5 th.
I use 195/50-15 now, before I used 185/55/14 which was a bit better.
I even did a scientific approach, I calculated drag vs engine torque and looked what is left at the outside of the wheel to accelerate, see attached file.
And the 1.8 diff looks nice.
But still in doubt, low on budget, so 1.8 diff with no lsd ....will it work good enough?
Is a lsd needed on the ring, I'm not sure.
Looks like it helps a lot at the twisty bits where my 75 is made for and I have the most fun.
But on the long term:
- If I make the car lighter (there is a lot which still can be done).
- Get better in my driving and pick up some more speed.
- Find the old sock with coins and invest in more power.
==> will the 1.8 diff become to short???
Or a realistic approach...by then I still can put in a ts diff.