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E30 the biowaste - M20B28 itb race car

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    E30 the biowaste - M20B28 itb race car

    It's time to write something about my racing E30. I bought it just as a empty rolling 320is shell with a rollcage.

    After putting in some basic stuff like Corrado/RX7 brakes, rally coilovers, 4-speed dogbox, Quaife torsen diff and M20B28 it ran quite well.







    Dynoed this in my ex Bosch FLA 203 chassis dyno. 259hp DIN.

    These need to retire now.



    These need also more attention. The rose joints get loose every now and then.
    Last edited by hasa; 03-17-2019, 02:26 AM.

    #2
    So here are new plans for coming seasons:

    +Custom valved BC-Racing suspension, 5x120 conversion
    +MRT control arms



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      #3
      Nice numbers for a b28!

      Are those s50b30(2) throttles?


      Curious of the engine specifications.
      john@m20guru.com
      Links:
      Transaction feedback: Here, here and here. Thanks :D

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        #4
        ITB setup is combination of dBilas intake and Jenvey 45mm throttle bodies. It has slightly too large diameter compared to the engine output I think.

        Actually the first B28 suffered from oiling problem and spun a bearing.



        After that I built a new engine. Another 84mm crankshaft, new 130mm H-beam rods, forged pistons from IE ( originally targeted to a B25 with 10.5 compression ). Std 885 head + Schrick 304, bulky tubular headers. But now oil splash shield + scraper fitted !!!





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          #5
          Enjoyed the read ... keep it coming.

          I recently picked up a retired '88 M3 GTS2 car that I'm bring back to the street somewhat. Auto cross & some parking lot racing will be its limit + some spirited street driving. No TUV or MOT here in my State so ... run what ya brung on the streets!!

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            #6
            Raised shock towers?

            1991 325iS turbo

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              #7
              Looks like a fun car! Could you post some more pictures of the trailing arms when you have a chance?

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                #8
                Originally posted by alistairolsen View Post
                Looks like a fun car! Could you post some more pictures of the trailing arms when you have a chance?
                Yes I will. When I got the donor car, someone had started the trailing arm modification for 0 ( zero!!! ) sweep angle. I dont know why, it was not meant for drag racing but gravel rally instead.

                Anyway all I could do without major labor was to relocate the mounting points, resulting with 8 degree angle and rose joints in all 4 connecting points.

                It's really difficult to adjust and gets often loose, so I need to do new setup. I will post pictures then.

                Last edited by hasa; 03-17-2019, 12:22 AM.

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                  #9
                  Yesterday I changed a new bearing/hub. Seems that the original dust ring will not work with SKF hubs, so I removed it. Should not be bad for a race car.



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                    #10



                    Sent from my iPhone using Tapatalk

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                      #11
                      Proper race car bits. Love it!
                      I do things.

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                        #12
                        Something must be done!


                        Sent from my iPhone using Tapatalk

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                          #13




                          Done some websopping. M3 bodykit came from ACM, quality was big disappointment compared to the price.

                          But Ebaying a Z3 crossmember+arms compensated!


                          Sent from my iPhone using Tapatalk

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                            #14
                            Very interesting project, cool
                            :coolphoto:

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                              #15
                              This setup is going to retire now. Unpossible to adjust while in place. I will build something more simple from the Z-crossmember



                              These pins are excellent innovation!




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