zf transmission, so what diff?

[evil_twin]

Alright, I have a zf transmission, so what diff should I be running? I searched and found what people get for getrags, but I know the gearing in the zf is different. Right now I'm running a 3.73 and it just feels like the gear is too high. Anybody know what would be the best choice? Thanks,

[e30s52]

I have 3.25lsd for my s52. Its the same ratio as the getrage with 4.10lsd rear end.

[jahnaboi]

What rpm are you at e30s52 with your 3.25 at 80 mph?

[e30s52]

I will check saturday I dont have the car with me right now.

[vr4boy]

i was at 3.2k rpm at 65mph w/ a 3.25lsd on my e30m3 s52 using a zf.
switched over to a 2.93lsd and pretty happy with it now.

FIXED:-)

[Danny]

32000 rpms?

Holy shit.

[Aptyp]

32k, that's like formula 1 shit and then some

3200 perhaps?

[Danny]

No.

Pretty sure he meant 32000.

[e30polak]

i was at 32k rpm at 65mph w/ a 3.25lsd on my e30m3 s52 using a zf.
switched over to a 2.93lsd and pretty happy with it now.

My tach is off, so it says 2900 at 65mph. I cruise 80 at 3400...I love vanos in fifth on the freeway! :woowoo:
I want a 6 spd with a 3.46 dammit!

[Jean]

ZF + 3.73 is going to be my starting point.

[Uber E30]

you're insane jean, hope this is just a track rat.

[Jean]

It is :) I need quick acceleration in the first 3 gears.

[gobuffs]

The Getrag and ZF ratios are nearly identical.

I have a 4.10 diff now (worked perfect at Road Atlanta, a 3.91 might have been better at Watkins Glen with more track time). I want to go to a 4.45 with a 6 speed.

[japspecvr6]

ZF + 3.73 is going to be my starting point.

I Hate this setup. Its the one I have now.

[e30polak]

ZF + 3.73 is going to be my starting point.

I hope you like to shift a lot. Those are some pretty short gears...1st will be extremely short.