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What gearbox+diff combo would produce this....

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    #1

    What gearbox+diff combo would produce this....

    So I just took a M50 swapped 325i for a test drive and was a little stumped as to what gearbox/diff setup the car is running...

    5th gear 110kmh (68mph) and its sitting on 3500rpm.......

    Diff back case says S3.73 but the owner has told me it has a 3.91 ratio in it....

    As far as I can see the only way this can be right is if the car has a 3.91 diff and a 1:1 5th gear which is stupidly close for something I would want to daily drive (my race car has an M20 with G260 + 4.1 LSD and i find that way to high revving to drive on the motorway...)
    90 318i M62B44 OBD1
    02 530i Touring (Airlift 3P)
    Tags: None
    #2
    All E3) transmissions had a 1:1 5th.
    2006 GMC Sierra 2500HD 4WD LBZ/Allison
    2002 BMW M3 Alpinweiß/Black
    1999 323i GTS2 Alpinweiß
    1995 M3 Dakargelb/Black     - S50B32/S6S420G/3.91
    1990 325is Brilliantrot/Tan
    1989 M3 Alpinweiß/Black

    Hers: 1996 Porsche 911 Turbo Black/Black
    Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd

    sigpic

    Comment

      #3
      Originally posted by nrubenstein View Post
      All E3) transmissions had a 1:1 5th.
      In whos dreams?
      Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.


      Originally posted by der affe
      first try a finger or 2, you need to have them suck on it first and get it nice and wet to help it slip in.

      if she goes for that, astroglide up your pole, have her lay on her stomach and slip it in slowly and bury it to your balls and leave it there until she relaxes. once she is used to it slam that ass like a screen door.

      Comment

        #4
        What RPM does your race car sit at doing 110? I have a calculator in excel somewhere, will dig it up
        Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.


        Originally posted by der affe
        first try a finger or 2, you need to have them suck on it first and get it nice and wet to help it slip in.

        if she goes for that, astroglide up your pole, have her lay on her stomach and slip it in slowly and bury it to your balls and leave it there until she relaxes. once she is used to it slam that ass like a screen door.

        Comment

          #5
          Cant really remember the racecar rpm, its been off the road having 2.7L stroker built since early this year but im guessing about 3300rpm ish
          90 318i M62B44 OBD1
          02 530i Touring (Airlift 3P)

          Comment

            #6
            Have a play with calc http://www.csgnetwork.com/rpmcalc.html

            Sounds lie 4.27 if it had the non existant 0.81 5th box

            Or 3.46 if it did have a 1:1 5th box
            Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.


            Originally posted by der affe
            first try a finger or 2, you need to have them suck on it first and get it nice and wet to help it slip in.

            if she goes for that, astroglide up your pole, have her lay on her stomach and slip it in slowly and bury it to your balls and leave it there until she relaxes. once she is used to it slam that ass like a screen door.

            Comment

              #7
              68mph
              25inch tire (car is running 205/55/16 tires)
              3.73:1 Final drive
              1:1 5th

              = 3408rpm

              68mph
              25inch tire (car is running 205/55/16 tires)
              3.91:1 Final drive
              1:1 5th

              = 3573rpm


              hmmm so maybe the guy is wrong and it does have a 3.73 diff, cause its definitely closer to 3400rpm @ 110 than it is 3600....

              Wonder how hard it would be to get a 3.25:1 LSD in AUS or if someone would wan to swap one for this 3.73....

              ::: The M50 car feels similar to my racecar when it had a 4.45:1 (that was fun... welded 4.45 hehehe)
              Last edited by wakdog; 07-24-2011, 05:41 AM.
              90 318i M62B44 OBD1
              02 530i Touring (Airlift 3P)

              Comment

                #8
                I worked on tyre size close to factory.
                Reason being BMW would use the original tyre size to calibrate the speedo.
                The larger OD tyres are only going to change actual speed, not alter the speedo to rpm equation unless you were using a GPS to measure speed?
                Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.


                Originally posted by der affe
                first try a finger or 2, you need to have them suck on it first and get it nice and wet to help it slip in.

                if she goes for that, astroglide up your pole, have her lay on her stomach and slip it in slowly and bury it to your balls and leave it there until she relaxes. once she is used to it slam that ass like a screen door.

                Comment

                  #9
                  I run NVm50>G260>4.10 LSD and I love it :D


                  90 325is alpine2 m50b25 becoming a dorifto car.

                  Comment

                    #10
                    All 5 speed manual gearboxes Paired OEM by BMW to 24v engines had 1:1 5th gear; basically the 4th of any e30 original 5 speed transmission.

                    3.47, 3.38, 3.25, 3.23, 3.15, 3.07, 2.93 are all popular ratios to run with a 1:1 non-overdrive 5th gear in an e30 with 24v swap



                    ***


                    3.73+ 1:1 5th gear 5mt is pretty insane, not a daily driver option if fuel costs are of concern.

                    6 speed manual with 3.73 is good though, e46M3 with getrag 6mt has a 3.62 final drive standard.
                    OBD1 M54/M52TU swap as a M50b25

                    Z4 non powered steering rack fits e30



                    Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                    Comment

                      #11
                      I don't get bad gas mileage with my setup I have above. Not the greatest and I beat on my e30. Maybe Luke 18-20.


                      90 325is alpine2 m50b25 becoming a dorifto car.

                      Comment

                        #12
                        non vanos M50 was paired OEM by BMW with a 4.10 in some e34's. its not terrible as the NV lacks torque on bottom end to pull the 3800lb sled around; this was great for my e34it.
                        OBD1 M54/M52TU swap as a M50b25

                        Z4 non powered steering rack fits e30



                        Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                        Comment

                          #13
                          big calculator/comparison tool here:

                          Speed Calculator - Georgia Fiero Club Official Website
                          http://gafiero.org/speedcalc.shtml
                          This is the official website for the Georgia Fiero Club. We specialize in helping other people with Fieros, organizing Fiero-related events, etc.
                          I don't always wreck cars, but when I do I wreck them into trees.

                          91' 318is S50 swap - The Black Widow

                          Comment

                            #14
                            I ended up buying the car, got it on the hoist and it is a 3.91 crown/pinion, so im going to just swap it out for a 3.15 I pulled from a scrap eta
                            90 318i M62B44 OBD1
                            02 530i Touring (Airlift 3P)

                            Comment

                              #15
                              What gearbox does it have, that was the missing link lol.

                              Pics? Where in aus?
                              Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.


                              Originally posted by der affe
                              first try a finger or 2, you need to have them suck on it first and get it nice and wet to help it slip in.

                              if she goes for that, astroglide up your pole, have her lay on her stomach and slip it in slowly and bury it to your balls and leave it there until she relaxes. once she is used to it slam that ass like a screen door.

                              Comment

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