E30 Zone

Hello all,

Sounds like my diff is on its way out so went to have a look at the tab on the diff and its totally rusted away so was wondering what LSdiff I would need to put in to replace the current.

Any ideas please? Thanks in anticipation. Cheers, Shaun

4.10 is standard

DHFiS wrote:4.10 is standard

Cheers bud.

mine is a 3.91 seems fine

Yep, 3.91 slipper, it's generally a medium case, so you can throw all the abuse you want at it & more

Thanks fellas.

so what difference would a 3.91 make to an is in terms of the speed ? acceleration and top end ? over the standard 4.10 ?

polsta wrote:so what difference would a 3.91 make to an is in terms of the speed ? acceleration and top end ? over the standard 4.10 ?

http://www.esatclear.ie/~bpurcell/318is ... fferential

DHFiS wrote:

polsta wrote:so what difference would a 3.91 make to an is in terms of the speed ? acceleration and top end ? over the standard 4.10 ?

http://www.esatclear.ie/~bpurcell/318is ... fferential

Superb! thanks DHFIS.

Theres a rev calculator you can use to give you a rev/ output speed reference for each gear

Not got the link but search google for 'john g burns' and 'gearing' or 'rev calculator'

You'll need your tire size & gearbox ratios to get figures but it's a useful for exact compaisons..

i8lufc wrote:

DHFiS wrote:

polsta wrote:so what difference would a 3.91 make to an is in terms of the speed ? acceleration and top end ? over the standard 4.10 ?

http://www.esatclear.ie/~bpurcell/318is ... fferential

Superb! thanks DHFIS.

+1 thanks

im not sure what diff i have, although i think my car can pull 60 flat out in 2nd not 53 !]

i really need to find out what my diff is exactly and confirm,all i can presume is that its a 4.10 standard but i dont know for sure

i had a 2ltr pinto on webbers that would hit 70 mph in second,bolted in a mk11 escort when i was your age ,good to see you chose old skool rwd rightness over the fields of crap out there

I've had my 318is chipped and its back up to around 144bhp, so I'm thinking now, I need a 3.91 lsd...

i8lufc wrote:I've had my 318is chipped and its back up to around 144bhp, so I'm thinking now, I need a 3.91 lsd...

makes sense i had mine dynod @ 152 bhp with a lightened flywheel,it made 125 mph and ran out of Diff .