How do I find my LSD rear end ratio?

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  • AutoXinE30
    Wrencher
    • Aug 2007
    • 277
    #1

    How do I find my LSD rear end ratio?

    Yeah, I know about the tag thing... my tag is rusted and corroded to hell and can't be read...

    What do I look for now?
    Tags: None
    • asubimmer
      R3V OG
      • Jul 2004
      • 6482
      #2
      take it appart and count the ring and pinion...
      ///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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        • Wishno87
          R3V OG
          • Jul 2007
          • 6025
          #3
          Originally posted by asubimmer
          take it appart and count the ring and pinion...
          sounds like its going to be a long night;)
          Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

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            • AutoXinE30
              Wrencher
              • Aug 2007
              • 277
              #4
              yeah ouch... haha

              is there no way to judge it by rpm's in certian gears? or are they just that close together?

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                • jlevie
                  R3V OG
                  • Nov 2006
                  • 13530
                  #5
                  You can get the ratio by direct measurement. Jack up the rear of the car, place the transmission in neutral, and rotate the driveshaft counting turns of the it and the rear wheels. Your 325is would have come with a 3.73 diff and so 41 rotations of the driveshaft should result in 11 rotations of the wheels.
                  The car makes it possible, but the driver makes it happen.
                  Jim Levie, Huntsville, AL

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                    • SpecM
                      R3V Elite
                      • Oct 2005
                      • 4531
                      #6
                      -What's your rpm in 5th @ 60mph?
                      1989 cirrisblau-metallic 325i

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