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What diff gearing should i use?

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    What diff gearing should i use?

    I have a 2.93 open diff in my e30 m50 5 speed swap. Needless to say, this needs to change. I want good acceleration and i dont really care much about top end as long as its up above 130 or 140. So what gearing should i use?? Im definitely going lsd but im not sure if i should use a 3.73 or a 4.10. I dont wanna be shifting every 3 seconds but 4.10 might be fun for acceleration.

    any thoughts guys??


    86 Zinno es
    M50 inside

    #2
    well for starters you should post what tranny you are using. You prob want a 3.73 though.
    ///Alpinweiß II 24v 91' 318is, Alpinweiß III 99' 323i, 04' Yamaha R6 SE for sale, 00' VW GTi, 83' El Camino BURNED, 01' P71sold, 92' Miatasold

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      #3
      3.73 is probably your best choice no matter what trans you're running, the 4.10 is pretty much "just plain short".
      I'm Not Right in the Head | Random Rants and other Nonsense1st Order Logic Failure: Association fallacy, this type of fallacy can be expressed as (∃xS : φ(x)) → (∀xS : φ(x)), meaning "if there exists any x in the set S so that a property φ is true for x, then for all x in S the property φ must be true".

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        #4
        I went from 3.15 to 3.91 in my m50 project. Probs a tad to high so i would definantly go for the 3.73. With the jump in diff ratio i went with i also found i lost about 80-100kms total driving distance to a tank coz of the higher fuel consumption. Cheers, Ryan

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          #5
          im using the stock getrag 260 from the 84 eta. I was thinkin 3.73 also, i thought 4.10 would be pretty high. Yeah fuel isnt a huge issue for me so all well. But yeah thanks guys, i think this is the only forum i have been on thus far were i can get good answers for anything!! lol


          86 Zinno es
          M50 inside

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            #6
            By the math, at 7k in 5th gear, with 15" wheels and a 4.10 rear end, my theoretical top speed is 142 mph. Sure, there's plenty of stuff that'll blow by on the BIG tracks, but for just plain screwin around and having fun on smaller tracks, I like the tall gear. I'm also using a Getrag 240, which has closer ratios, but the 5th gear ratio is only .05 different than the 260. I love rowing gears, but depending on the craziness level of your build, I dunno if you're gonna need to be rowing all the time...

            I've also found 3.73 to be about a perfect gear for almost anything. 6 vehicles (Chevrolets from 1966-2003) in my family, none of them stock and all of them fairly quick, all have 3.73 diffs. These include musclecars, late-model Power Tour types, and trucks.
            sigpic

            Mike

            '91 325i track car. Mostly...

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              #7
              3.73 definitely.
              BimmerHeads
              Classic BMW Specialists
              Santa Clarita, CA

              www.BimmerHeads.com

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