Turbo time for my S50 on a "budget"

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  • BMW_TUNER
    E30 Fanatic
    • Jul 2006
    • 1377

    #46
    Originally posted by vaughnbannister
    Getting the clutch balanced ?
    Sorry I meant to say that I got the clutch flywheel and new pressure plate today. I dropped the flywheel and pressure plate off to have it balances with the rotating assembly. I am figuring having it all spun is smart give the that I am taking a significant amount of weight out of the rotating assembly. My estimate is the new pistons are 297x6=1782 gram and the new rods are 489x6=2934. Factory piston weight empty is apparently 560x6=3360 and rods are 540x6=3240 so factory rotating assembly is 6600gram.
    1989 332IS -S-Fiddy Four-Some weight removed.
    5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

    Comment

    • 052JMK
      Member
      • Dec 2014
      • 61

      #47
      When you lighten your rotating assembly does that mean, you can exceed the 7,200 RPM limit without destroying your motor.. Obviously faster to rev and I assume you get slightly more power? Maybe?
      Current
      | '91 318is | M50b28 | Schrick | Racing Dynamic's |

      Late 2016
      | S50 Frankenstein Turbo Build |

      Past
      | '93 325is | '87 325is | '92 240sx | '92 GTI | '87 325e | '84 318i | '95 325is | '92 318is | '87 325i

      sigpic
      Yocale.com

      Comment

      • vaughnbannister
        Wrencher
        • Aug 2012
        • 206

        #48
        Originally posted by BMW_TUNER
        Sorry I meant to say that I got the clutch flywheel and new pressure plate today. I dropped the flywheel and pressure plate off to have it balances with the rotating assembly. I am figuring having it all spun is smart give the that I am taking a significant amount of weight out of the rotating assembly. My estimate is the new pistons are 297x6=1782 gram and the new rods are 489x6=2934. Factory piston weight empty is apparently 560x6=3360 and rods are 540x6=3240 so factory rotating assembly is 6600gram.

        My thought on that is if the crank is balanced and the clutch is balanced then putting them together it should theoretically be balanced.
        - S50 Swapped E30 1/1 Mineral White -
        @vaughnbannister on IG

        Comment

        • BMW_TUNER
          E30 Fanatic
          • Jul 2006
          • 1377

          #49
          Originally posted by vaughnbannister
          My thought on that is if the crank is balanced and the clutch is balanced then putting them together it should theoretically be balanced.
          I totally agree and usually I would not have given it a second thought but the balancing shop charges the same to balance as much or as little as I give them so I said "f" it and gave them everything. I figured its a new Stage 3 Grip force flywheel and pressure plate so its probably pointless, but if there is any tiny bit they can do to the pressure plate (which is apparently not uncommon) then it costs me nothing.

          The crank had to be spun again and rebalanced because I am pulling 4.2lbs out of my rotating assembly and the counterweights would be very far off as thats a 29% reduction in counter balanced weight. Less weight= faster rev and maybe a few more HP by the time they drill my crank into swiss cheese I will probably have 5 lbs taken out of the rotating mass. :devil:
          1989 332IS -S-Fiddy Four-Some weight removed.
          5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

          Comment

          • BMW_TUNER
            E30 Fanatic
            • Jul 2006
            • 1377

            #50
            Originally posted by 052JMK
            When you lighten your rotating assembly does that mean, you can exceed the 7,200 RPM limit without destroying your motor.. Obviously faster to rev and I assume you get slightly more power? Maybe?
            The word is that Valve float is the big problem beyond about 7400. I will try to spin it as far as it will go and still make power. I know my head will flow to support it its just a matter of if the valves will open and close.
            1989 332IS -S-Fiddy Four-Some weight removed.
            5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

            Comment

            • BMW_TUNER
              E30 Fanatic
              • Jul 2006
              • 1377

              #51
              Build Tease pic.

              1989 332IS -S-Fiddy Four-Some weight removed.
              5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

              Comment

              • Razor1981
                Noobie
                • Jan 2016
                • 25

                #52
                Loving the build. Looking forward to seeing more. Keeps me motivated to stay positive with my bronzit.:coolphoto:

                Comment

                • BMW_TUNER
                  E30 Fanatic
                  • Jul 2006
                  • 1377

                  #53
                  Powder coating is coming in one piece at a time.

                  Since I likely will not be running my S50 engine cover this red one is winning right now.



                  But the black looks sexy too.



                  Especially with the cover.
                  1989 332IS -S-Fiddy Four-Some weight removed.
                  5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                  Comment

                  • BMW_TUNER
                    E30 Fanatic
                    • Jul 2006
                    • 1377

                    #54
                    So I am now thinking about trying to shoe horn one of these in the upper mounting position. http://www.treadstoneperformance.com...=product_68236
                    1989 332IS -S-Fiddy Four-Some weight removed.
                    5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                    Comment

                    • vaughnbannister
                      Wrencher
                      • Aug 2012
                      • 206

                      #55
                      I'll take the black one (;
                      I'm also interested to see what Intercooler you go with. I haven't even though that far. I think your ahead of me now[emoji848]
                      - S50 Swapped E30 1/1 Mineral White -
                      @vaughnbannister on IG

                      Comment

                      • BMW_TUNER
                        E30 Fanatic
                        • Jul 2006
                        • 1377

                        #56
                        I am struggling with what will fit and what I can get the most air flow to. I have been through the intercooler threads everywhere and I am still struggling to pick one.
                        1989 332IS -S-Fiddy Four-Some weight removed.
                        5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                        Comment

                        • Northern
                          R3V Elite
                          • Nov 2010
                          • 5040

                          #57
                          Originally posted by BMW_TUNER
                          I figured its a new Stage 3 Grip force flywheel and pressure plate so its probably pointless, but if there is any tiny bit they can do to the pressure plate (which is apparently not uncommon) then it costs me nothing.
                          I'm running the Gripforce/FX/F1 Racing Stage 3 clutch/flywheel. I had the fw/pp balanced before install, and they removed ~.4g to balance the assembly. Not sure if that's enough to affect anything, but I felt justified.

                          Originally posted by BMW_TUNER
                          The word is that Valve float is the big problem beyond about 7400. I will try to spin it as far as it will go and still make power. I know my head will flow to support it its just a matter of if the valves will open and close.
                          I don't think the crank harmonics of the S50 are nearly as bad as the S52. I don't think I've ever heard of issues with the S50, and you hear about issues with higher revving S52/M54's all the time. If you do end up being limited by valve float, there are some easy solutions to that. haha
                          Originally posted by priapism
                          My girl don't know shit, but she bakes a mean cupcake.
                          Originally posted by shameson
                          Usually it's best not to know how much money you have into your e30

                          Comment

                          • BMW_TUNER
                            E30 Fanatic
                            • Jul 2006
                            • 1377

                            #58
                            Talked to the machine shop. Sounds like all of the parts are coming back to me or assembly at the tend of this week. Time to Order plastigage and clean room wipes. Are there any recommendations out there for RTV on the front of the head gasket.
                            1989 332IS -S-Fiddy Four-Some weight removed.
                            5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                            Comment

                            • BMW_TUNER
                              E30 Fanatic
                              • Jul 2006
                              • 1377

                              #59
                              3 inch Intercooler in and under the headlights with no trimming.


                              1989 332IS -S-Fiddy Four-Some weight removed.
                              5 lug E36 M3 Brakes Coilovers and LTW's and No ABS.

                              Comment

                              • vaughnbannister
                                Wrencher
                                • Aug 2012
                                • 206

                                #60
                                Info on Intercooler? I might do the same set up [emoji848]
                                - S50 Swapped E30 1/1 Mineral White -
                                @vaughnbannister on IG

                                Comment

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