as above, running 13" x 80 profile, car tops out approx 125 mph in 5 gear, no faster in 6 gear, i dont mind sacrifing my top end to 110 to 115, has any one had experience on switching to the 3.77 , cheers
sorry should of said tyre size of 185 x 13 x 60 doh!,, not 80 ......
You should be able to rev out in 6th with a 3.54 ratio. Regardless of what ratio you run, this would indicate to me that you are for some reason down
on power with your installation. Has it been on a rolling road?
By all means drop the ratio if you want to limit your top speed, but I would keep it at where you are as it is an ideal ratio for reasonable cruising
revs and being geared correctly for long straights on circuits (if you do trackdays).
Regards
Paul
Hi are you sure of your current ratio
Most R1's run 3.62 successfully on 15's so why you should have a problem on 13's is odd?
my 5jj 7 tops out at 115mph in 6th 5 goes to just over 100 !!
im using 3.89 i would say as close to 3.6as poss would be perfect im on 15s
I have just done some calculations on the expected top speed of you car with a 3.54 diff and 185/60 R13 tyres
Works out to around 121mph at 11,750 revs. Max is 112mph in 5th.
So I think your speedo is way out or you have a different diff in there than you think!!
- Paul
quote:
Originally posted by progers
I have just done some calculations on the expected top speed of you car with a 3.54 diff and 185/60 R13 tyres
Works out to around 121mph at 11,750 revs. Max is 112mph in 5th.
So I think your speedo is way out or you have a different diff in there than you think!!
- Paul