1990 318is - Which Differential?

[i8lufc]

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

[DHFiS]

4.10 is standard

[i8lufc]

4.10 is standard

Cheers bud.

[k20trew]

mine is a 3.91 seems fine

[Barx325i]

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

[i8lufc]

Thanks fellas.

[polsta]

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 ?

[DHFiS]

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

[i8lufc]

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.

[Barx325i]

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..

[polsta]

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

[magpie]

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

[i8lufc]

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

[magpie]

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 .