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    queation about rear diff

    What E30 Diff . would be good too handle 260Hp +?
    im thinking about putting an 13B S4 Turbo II (Rotary) motor in my E30..
    Last edited by E30 318T; 10-26-2006, 12:27 PM.


    #2
    good queation.

    [IMG]https://cimg4.ibsrv.net/gimg/my350z.com-vbulletin/550x225/80-parkerbsig_5096690e71d912ec1addc4a84e99c374685fc03 8.jpg[/IMG

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      #3
      rotary in an e30. Sounds interesting, why though? IMO thats alot of work/money to have a less reliable motor. There are a lot of ways to get 260+ hp in an e30, i think swapping a turbo 13b is least logical. More props to you if you get it done- it would be unique.

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        #4
        Any of the diffs can handle 260hp. It just depends on what tranny you are planning on using to determine the propper gear ratio.

        -Erik

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          #5
          Best is the 4.10 second to the 3.73 for high output. If it is lower than that you will have issues.

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            #6
            My 3.73 had no trouble holding roughly that amount of HP.
            BimmerHeads
            Classic BMW Specialists
            Santa Clarita, CA

            www.BimmerHeads.com

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              #7
              Originally posted by MR 325 View Post
              My 3.73 had no trouble holding roughly that amount of HP.
              Would a 4.10 have been better since it would get to the point where the turbo kicks in faster?
              sigpic

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                #8
                truee i have a shop over here in NYC that is specialized in Rotary. the swap and labor is goin to be around $5000-$6000 since the motors+ tranny are at a decent price which is $1700-$2500 and it would only take up have of the engine bay VERus the M50,M30 motors... and thank you for answering my Diff question....

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                  #9
                  Originally posted by DarkWing6 View Post
                  Would a 4.10 have been better since it would get to the point where the turbo kicks in faster?
                  Usually people go with higher gearing actually. I was pretty happy with the stock diff though.
                  BimmerHeads
                  Classic BMW Specialists
                  Santa Clarita, CA

                  www.BimmerHeads.com

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                    #10
                    I really think the gearing you go with would depend on the turbo. With one like Matt's, you would want something like a 3.73 or 4.10 since it kicks in later, but with a smaller turbo that kicks in earlier you would want something with higher gearing. Does this sound right?
                    sigpic

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                      #11
                      im still learning about gear Ratios if i do, do the swap i will do it between spring and summer. and it will be run stock on a stock turbo until i want more power thats why i stated 260 + hp

                      n also stock rotary motors like the one tha im thinking has more potential than you think. a friend of my had a non turbo 13b in his car and stated from factory i think 200hp and it could take out 350z and those are 280hp (just an example) on drag or highway..and those are highway cars if you ever encountered one.

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                        #12
                        why not get a sr20det? a little less hp but easier and i bet cheaper to install...
                        sigpic

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                          #13
                          same price or cheaper and easier to modd for high hp...

                          Originally posted by PУCCKAЯ_e30 View Post
                          why not get a sr20det? a little less hp but easier and i bet cheaper to install...

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