Which diff ratio for M42?

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  • Cal
    Noobie
    • Sep 2010
    • 38

    #16
    I can't believe some of you are suggesting longer gears. These things are a slug with 4.1

    Comment

    • greanthumb
      E30 Mastermind
      • May 2010
      • 1992

      #17
      +1^^^^
      91 318is...DD:finger:/85 325es SOLD/91 318is RIP


      Originally posted by naplesE30
      Must stop clicking on Norwegian threads. Makes me wanna punch my car in da mouf.
      Originally posted by einstein57
      My tranny sounds like a blender full of walnuts. So I added sound deadner to the tunnel and put in a louder stereo. Am I doing it right?
      Castro Motorsport/E30 specialist
      North Hollywood, Ca. 818 310-2497

      Comment

      • SimplyDope
        E30 Fanatic
        • Mar 2010
        • 1335

        #18
        I didn't find the change to the 3.73 to be as dramatic as some of you are making it out to be. If you do any driving on the highway, it's a step-up from the 4.10 in my opinion.

        It has slightly less "snap" acceleration-wise, making it feel more like a normal car, but it's definitely not sluggish and I personally love not having to change gears so quickly. I honestly wouldn't be surprised if 0-60 times improved.

        Comment

        • KenC
          King of Kegstands
          • Oct 2003
          • 14396

          #19
          Who the hell cares about 0-60? News Flash: you're going to lose to that Accord next to you at the light.

          I just popped a 4.45LSD into mine a few weeks ago. I like it better than the 4.10. It's a little peppier. RPMs only went up 2-300 at freeway cruising speed.

          As mentioned before, these cars aren't gear limited.
          Originally posted by Gruelius
          and i do not know what bugg brakes are.

          Comment

          • Wh33lhop
            R3V OG
            • Feb 2009
            • 11705

            #20
            Originally posted by Cal
            I can't believe some of you are suggesting longer gears. These things are a slug with 4.1
            No, they're a slug with M42s. Different gears aren't going to change that. ;)
            paint sucks

            Comment

            • Dj Buttchug
              R3V OG
              • Jun 2010
              • 7633

              #21
              Originally posted by nando
              the top speed of an M42 powered car probably doesn't change or goes down with an excessively long rear diff ratio.

              E30s are almost *never* gear speed limited. I don't get why people think a 4.10 or higher makes the top speed lower. I also don't understand the desire to go 120mph in 3rd gear..
              uhh wut? how does it not change the top speed? you install a longer gear it will give a greater top speed, shorter gives lower top speed last time i checked...

              Originally posted by Supadave
              Are going to stick with the 2.93?
              for now yes. I am an exception to most because im boosted. more power changes things, especially when you want to have time to build boost instead of having to shift all the time.

              Originally posted by KenC
              Who the hell cares about 0-60? News Flash: you're going to lose to that Accord next to you at the light.

              I just popped a 4.45LSD into mine a few weeks ago. I like it better than the 4.10. It's a little peppier. RPMs only went up 2-300 at freeway cruising speed.

              As mentioned before, these cars aren't gear limited.
              srsly? race an accord at a light? cmon now

              Turbo M42 Build Thread :Here
              Ig:ryno_pzk
              I like the tuna here.
              Originally posted by lambo
              Buttchug. The official poster child of r3v.

              Comment

              • Wh33lhop
                R3V OG
                • Feb 2009
                • 11705

                #22
                Originally posted by Dj Buttchug
                uhh wut? how does it not change the top speed? you install a longer gear it will give a greater top speed, shorter gives lower top speed last time i checked...
                It does if you have enough power to wind out the top gear. Most M42s do not.
                paint sucks

                Comment

                • nando
                  Moderator
                  • Nov 2003
                  • 34827

                  #23
                  yeah, are you hitting the limiter in 5th gear? no? then you're not changing your top speed with a shorter diff. You might actually lower it with a taller one since the car will no longer have enough torque in 5th gear to push through the air at high speed.

                  and it WILL take longer to get there. aside from shifting times (you still have 5 gears so it doesn't change that), a shorter diff will accelerate faster than a taller one. it's basic math..
                  Build thread

                  Bimmerlabs

                  Comment

                  • M-technik-3
                    I waste 90% of my day here and all I got was this stupid title
                    • Oct 2003
                    • 18946

                    #24
                    Originally posted by e30huh
                    there's a 3.46 for M42 for sale on the local craigslist.

                    http://washingtondc.craigslist.org/n...058727263.html

                    E36 lsd....different than an E30.
                    https://www.facebook.com/BentOverRacing

                    Comment

                    • revhard7
                      Noobie
                      • Sep 2010
                      • 38

                      #25
                      i have a 4.27 on my m42, i think its the best compromise for street use and its responsive on the highway, longer gearing ratios would kill it..
                      Last edited by revhard7; 11-19-2010, 06:09 AM.

                      Comment

                      • gearheadE30
                        No R3VLimiter
                        • Jun 2007
                        • 3734

                        #26
                        honestly, with the stock motor, a 4.10 is about right. Any shorter and it would get to be a pain, and any longer and the poor thing would be even more of a gutless wonder in daily driving. It just isn't practical to wind the motor up to higher RPM to spin a taller diff in daily driving to get the same performance out of it. I'm going to a 3.73, but that is only because of the turbo, and I'm doing a lot more highway driving than I used to.

                        Project M42 Turbo

                        Comment

                        • gsxrcop
                          Advanced Member
                          • Apr 2008
                          • 161

                          #27
                          I'm a little confused, a boosted m42 can make more power than alot of swaps I have seen. Not all m42's are created equal :)

                          "No, they're a slug with M42s. Different gears aren't going to change that."

                          Comment

                          • Wh33lhop
                            R3V OG
                            • Feb 2009
                            • 11705

                            #28
                            Originally posted by gsxrcop
                            I'm a little confused, a boosted m42 can make more power than alot of swaps I have seen. Not all m42's are created equal :)
                            Right, but 99.9% of M42s are not boosted. You can turbo anything and make it quick.
                            paint sucks

                            Comment

                            • Schnitzer318is
                              R3VLimited
                              • Jan 2008
                              • 2057

                              #29
                              In my boosted car I went from the 4.10's to the 3.73's and HATED it. Took longer to build boost and "felt" slower. It might be a tad faster from 0-60 because of one less shift... but other times it is ALOT faster because of the decreased boost time.

                              That's been my experience anyway... ymmv.
                              "A good memory for quotes combined with a poor memory for attribution can lead to a false sense of originality."
                              -----------------------------------------
                              91 318is Turbo Sold
                              87 325 Daily driver Sold
                              06 4.8is X5
                              06 Mtec X3
                              05 4.4i X5 Sold
                              92 325ic Sold & Re-purchased
                              90 325i Sold
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                              01 323ci Sold
                              92 325i Sold
                              83 528e Totaled
                              98 328i Sold
                              93 325i Sold

                              Comment

                              • Dj Buttchug
                                R3V OG
                                • Jun 2010
                                • 7633

                                #30
                                maybe im confused as well... I dont know why but i love the 293. If you want it quick use lower gears. all your really doing is moving 100 whp in most m42s around some. Shit even when I was on a stock motor I ran a 293 from a 410 and loved it.

                                it all comes down to how you want to drive. Ive got multiple diffs so if im not feelin the longer 293 I swap to a 410.

                                After you swap diffs a few times you get good at it. I can do a diff swap in less than 20 min...

                                Turbo M42 Build Thread :Here
                                Ig:ryno_pzk
                                I like the tuna here.
                                Originally posted by lambo
                                Buttchug. The official poster child of r3v.

                                Comment

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