E30 325i HELP with LSD differential

Post Thu Jan 29, 2015 6:25 am

Dear All Hi,

I have an E30 325i and I want a LSD differential as my car does not have a LSD.

Can you please advice me which is the best LSD that I have to find? Ratio?

I want a LSD to improve also acceleration but to be ok for cruising as I am traveling.

Thank you in advance

Andreas

Post Thu Jan 29, 2015 8:11 am

Post Thu Jan 29, 2015 8:38 am

buster wrote:3.91

Hi it will shorter the gears a bit and it will be better in acceleration????

Post Thu Jan 29, 2015 8:45 am

3.91 is what is fitted to facelift 325 with manual box. Pre face lift 3.64

Post Thu Jan 29, 2015 9:33 am

buster wrote:3.91 is what is fitted to facelift 325 with manual box. Pre face lift 3.64

3.91 vs 3.64 which is better? the 3.64 is much longer than the 3.91 correct??

Post Thu Jan 29, 2015 8:12 pm

GTE wrote:
buster wrote:3.91 is what is fitted to facelift 325 with manual box. Pre face lift 3.64
3.91 vs 3.64 which is better? the 3.64 is much longer than the 3.91 correct??

about 7% longer, its not a huge difference

Post Tue Feb 03, 2015 10:50 am

reggid wrote:
GTE wrote:
buster wrote:3.91 is what is fitted to facelift 325 with manual box. Pre face lift 3.64
3.91 vs 3.64 which is better? the 3.64 is much longer than the 3.91 correct??
about 7% longer, its not a huge difference

Thanks for your help!! Much appreciated!!

So now any one that has for sale a LSD 3.91 or 3.64?

Post Mon Mar 16, 2015 8:25 am

Hi there I have found a 4.10 LSD that is for sale!

Is the 4.10 too 'short' will affect top speed?? Someone told me that the top speed will be not more than 100mph???

Will be the highway cruising ok or at 120-130km the rpm will be 4500??

Please advice asap.

Any help will be much appreciated.

Thanks in advance

Post Mon Mar 16, 2015 9:04 am

A 4.10:1 will make any long distance run very tiresome as the engine will be revving higher with more noise. Even though there isn't a huge gap between a 3.91:1 and 4.10:1, I wouldn't go shorter than the 3.91:1.

Also the E30 4.10:1 LSDs are usually small case diffs which possibly won't last too long if pushed hard in a 325i.
An LSD won't improve acceleration, just your chances of getting sideways.

Post Mon Mar 16, 2015 10:00 am

jmc330i wrote:A 4.10:1 will make any long distance run very tiresome as the engine will be revving higher with more noise. Even though there isn't a huge gap between a 3.91:1 and 4.10:1, I wouldn't go shorter than the 3.91:1.

Also the E30 4.10:1 LSDs are usually small case diffs which possibly won't last too long if pushed hard in a 325i.
An LSD won't improve acceleration, just your chances of getting sideways.

Hi there in order to source a 3.91:1 differential from which BMW model shall I look from?

I know that will not improve allot the acceleration but it will improve a bit and I will have an LSD!! If I am going to pay I would like the best combination at least!!

Thanks

Post Mon Mar 16, 2015 10:03 am

Are you in the UK?

In the UK, the 3.91:1 LSD was standard on the 325i Sport, but could be specced from new on any 325i if the buyer wanted.

Post Mon Mar 16, 2015 10:07 am

jmc330i wrote:Are you in the UK?

In the UK, the 3.91:1 LSD was standard on the 325i Sport, but could be specced from new on any 325i if the buyer wanted.

No I am not in the UK but postage can be arranged!!

Do you know anyone that has such a diff for sale??

Post Mon Mar 16, 2015 10:10 am

A wanted ad on here would be a good place to start. Some of the regular traders might be able to help. Although, shipping a diff won't be cheap