325i LSD Opinions:

[bimmer_E30]

Hey so my E30 came with a open diff, i was wondering what is the best bang for the buck with an M20B25....i've heard some say 4.10LSD and some other say 3.73LSD...what is the best combo for the 325i.

I do alot of highway driving. but i wouldn't mind to pick up some "off the line" acceleration.

Discuss.

[TomSuddard]

My 325is with 205/50/15 tires and a 3:73 diff is spinning around 3700 on the highway. I doubt you want a 4:10.

[mitch500]

you trying to sell your 3.73 open diff on kijiji for 200 loll.

[bimmer_E30]

No, sell it an roll on what lol?

[accident]

why havent you died yet?

[alpinee30m50]

4.27 or bust :P

[dnova89]

You should ask these guys, they know all about LSD.



If it's your DD, just stick with a 3.73. It all comes down to personal preference.

[ak-]

My 4.10lsd on the freeway.

[Edev]

why havent you died yet?

qft.

[10/10ths]

The 4.10 will make a very noticeable difference for sure, but for a daily driven highway car I would NOT do it unless engine wear is not an issue for you or you are ok with driving slower (which is what I do to and from events)

The 4.10 was good for me on tight autocross courses but other than that it's just not a good choice. I am going back to a 3.73 for a more useable 2nd gear during autocross runs.

[Kershaw]

i just went from a 4.10 lsd to a 3.73 open.

4.10 is a really tall gear. i'd actually prefer a mid 3 lsd. like a 3.46.

[bimmer_E30]

how about 3.25 LSD?

[bimmer_E30]

why havent you died yet?

that was a really good contribution to this thread.
Hope you feel better about your self, internet thug.

[Philo]

3.73 On the stock stuff. 3.25 wouldn't be bad if you were running undersized tires. 3.25 would be choice if you plan on stepping up to a ZF tranny.

[Wh33lhop]

i just went from a 4.10 lsd to a 3.73 open.

4.10 is a really tall gear. i'd actually prefer a mid 3 lsd. like a 3.46.

4.10 is short. Tall gears are numerically lower.

I've got a 3.73 and I think it's about right for an M20 with a G260, 4.10 is pretty short but you'll obviously sacrifice cruising rpm. I think a 3.46 or so is ideal for an M50. Stock M20 gearing is actually pretty short. That makes it fun, but not as great for long distance cruising.