M30 Turbo Differential Ratio

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  • nybimmers
    Member
    • Jan 2014
    • 62

    #1

    M30 Turbo Differential Ratio

    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
    Wrencher
    • Jan 2011
    • 279

    #2
    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.

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    • nybimmers
      Member
      • Jan 2014
      • 62

      #3
      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

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      • Good & Tight
        Forum Sponsor
        • Apr 2004
        • 2057

        #4
        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.
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        • nybimmers
          Member
          • Jan 2014
          • 62

          #5
          Originally posted by 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.


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

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