M30 Turbo Differential Ratio

[nybimmers]

What's up guys. I'm trying to decide on what differential ratio to go with. I've been playing with the calculators online, just looking for some real world opinions. Car currently has a 3.73 and i feel it will be way too short. Who's running what?

[codrum]

I'm running a 3.73 LSD with an m20 turbo. It's short and snappy and makes for fun driving in the twisties up in the mountains which is about all I do with the e30. It depends on what kind of driving you plan on doing with it. If you'll mainly be cruising on the highway I'd look for something a little longer like a 3.25 or a 2.91.

[nybimmers]

I have a 2.93 i think i'm going to use, the 3.73 is too short with the m30 NA for me. Doing 70mph at around 3.2k rpms sucks lol

[Good & Tight]

2.93 over the 3.73 for sure. I have used both and the 2.93 makes the car faster, you stay in gear longer and let the torque do the work.

[nybimmers]

2.93 over the 3.73 for sure. I have used both and the 2.93 makes the car faster, you stay in gear longer and let the torque do the work.

Perfect! I just happen to have one sitting in my garage!