im going to be running this diff with 17 inch wheels on 40 profile tyres. Is it going to be ok or way too high a ratio?
The car will mainly be for drifting/taking up the strip/the occasional trackday and will only be used on the road maybe once or twice a week so not worried about fuel consumption or revs at motorway speed too much.
Am i right hoping that it should accelerate very well but maybe top out at say, 130ish mph?
3.91 diff with M30B35
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leeparkes
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Im running a 3.73 with 15" 50 profile tyres and its good fun 
Go for it!
Go for it!
Cypriotgeeza wrote:I done both my mates in my old 318is
felt so proud,even tried it with a E30 325i and got put in my place..
Gear ratio calculator can be found on the left hand menu here http://www.unixnerd.demon.co.uk/bmw.html
M30B35 with 3.91 makes second into first but is damn good fun. I only moved from the 3.91 as I do motorway miles now and it wasn't that much fun with the revs... overtaking was fun though
You have to be careful when it's a bit damp as you can easily spin up the back wheels in third at 30mph + whenplanting your right foot
130mph is 5569rpm with peak power around 4800rpm
M30B35 with 3.91 makes second into first but is damn good fun. I only moved from the 3.91 as I do motorway miles now and it wasn't that much fun with the revs... overtaking was fun though
You have to be careful when it's a bit damp as you can easily spin up the back wheels in third at 30mph + whenplanting your right foot
130mph is 5569rpm with peak power around 4800rpm
BMW E30 344i track car 
BMW F31 335d xdrive
BMW F31 335d xdrive