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Budget M42 turbo build

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    #61
    Originally posted by Emre View Post
    When I was running my M42 on the track, the transmission gave me constant trouble. It was a major weak point of that drivetrain and is the main reason why I finally gave up on it and swapped in an i6 engine & drivetrain.

    I miss the lightness of the M42 engine, but the rest of the drivetrain (including rear diff) just didn't seem to hold up to serious track use.
    yeah I've been getting this impression as well. I know the e36 M42 uses a slightly different verson of the getrag 240, and perhaps some of the M50 cars did as well? I can't find any concrete evidence aside from word-of-mouth that the e36 ones are any sturdier, or if they will even mate up, though.

    My diff will probably be swapped out for a medium case 3.73 or maybe a 4.10, but I kinda want some lower highway revs. The small case LSD I have seems to be doing really well, though; it's even pretty quiet with poly mounts and such.

    Project M42 Turbo

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      #62
      42lb injectors are in and running, the charcoal canister has been deleted, the IAC has its own air filter now (somehow this fixed a ton of idle issues) and the crank vent is now vented through a cheapo filter while I try to find a catch can...

      Project M42 Turbo

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        #63
        Sweet. Wish I could run an ICV... I really need to upgrade to MS2.

        Mine idles steady after a couple of mins of warmup, but if I turn on the AC, it dies. Soooooo I have to balance my throttle when I want to use the AC on idle. :(
        "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
        97 328is Sold
        01 323ci Sold
        92 325i Sold
        83 528e Totaled
        98 328i Sold
        93 325i Sold

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          #64
          Just running a map? that sounds awesome!!!! Yeah the barn door creates quite a bit of lag. I think it is a pretty big restriction with the supercharger plus i have to run a really small air filter because of space. I will be doing this for sure in the future. no rush on the write-up, but dont forget everything by the time you do it!

          By the way the e36 tranny has different ratios. They are much shorter and closer spaced. I got a killer deal on a rebuilt 3.46 with 40% lock up (its amazing) and with the e36 tranny my first gear is longer but the rest of the gears are shorter than the stock setup. I think eventually i will get a 6 speed

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            #65
            Schnitzer-before I put the funky second air filter on, mine took a second or two to compensate. now I can hardly even see the RPM change when I switch it on B)

            e304me-haha I'll try not to forget; I've got most of it written down though. I suppose if I can find an e36 trans, I may go that route, then. I want a longer (and medium case) diff anyway... I also considered a 6-speed from a 330i or something, but I can't find one for cheap :(

            Project M42 Turbo

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              #66
              Scored a 140k mile getrag 240 from an e30 318is for $100 with a guarantee :)

              Project M42 Turbo

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                #67
                Well, I now have the trans and flywheel and need to buy a clutch kit, the 323i TOB, and have the flywheel lightened. I think I have found some starter bits as well. And a little year-and-a-half long project was just finished: getting the Zender spoiler painted! I'll get pics up soon, cuz it's way too dark to take some now.

                Project M42 Turbo

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                  #68
                  I used the 325i TO bearing that came with my 325i single mass clutch kit. Works fine, save your coin ;)

                  Keep up the good work.
                  - Chris
                  Project M42 - 255 @ 19 psi

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                    #69
                    I used the 325i TO bearing that came with my 325i single mass clutch kit. Works fine, save your coin ;)

                    Keep up the good work.
                    - Chris
                    Project M42 - 255 @ 19 psi

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                      #70
                      haha too late; I was actually able to get the sachs clutch without the TO bearing and substitute in the 323i one at the same cost. It's nice working for a shop haha. So this weekend I will be installing a new 325i clutch, lightended single mass, M20 starter, new TOB, new pilot bearing, new clutch arm, pivots, etc, newish getrag 240, and a new CSB. Should be fun :).

                      BTW projected date for starting the turbo install is june 12-13, which is conveniently my birthday weekend haha

                      Project M42 Turbo

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                        #71
                        Originally posted by gearheadE30 View Post
                        BTW projected date for starting the turbo install is june 12-13, which is conveniently my birthday weekend haha
                        Cool, The week after is when I finish exams, will be getting cracking on mine again after that point!
                        - Chris
                        Project M42 - 255 @ 19 psi

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                          #72
                          Awesome! I just got the trans pulled out of my car, and everything involved there is getting a complete overhaul. M20 flywheel lightened to 16lbs, new clutch and PP, M20 starter, all new seals, pilot bearing, TOB, CSB, guibo, clutch release fork. Its gonna be nice :).

                          As for the turbo, I just purchased some more -10 AN fittings so I can fabricate an oil drain. After trying to figure out how the hell you mesure NPT fittings, I think I finally figured it out, and am getting senders, bugs, distribution blocks, and the like to install a 300 degree oil pressure gauge and an 80 psi oil pressure gauge. Hopefully they will be able to fit in the face of teh forward center console so I can keep my storage area and vents and everything else, but I don't know if there will be enough space between that and the heater core. Otherwise, they may end up horizontal in the rear center console. Impossible to see, I know, but much more practical on a street car. The boost gauge will be in one of the vents, though, so I can keep an eye on boost creep and such in the tuning stage. Otherwise, all I need now is IC brackets, a few silicone intake bits, and relocation of the coils (to the underhood battery tray) and the washer reservoir (e36 tank mounted over the ABS pump). Its getting close.... :)

                          Project M42 Turbo

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                            #73
                            That clutch is not going to hold up for long with boost. :(

                            Even at 7psi I experienced slipping with the stock clutch. Had to go with a stage 2 kit from Spec. Not sure if the 325i one will hold up better but we'll see.
                            "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
                            97 328is Sold
                            01 323ci Sold
                            92 325i Sold
                            83 528e Totaled
                            98 328i Sold
                            93 325i Sold

                            Comment


                              #74
                              Well, hopefully it will...228 mm vs 215mm makes a pretty big difference because of the diameter of the friction material. At a glance, the 325i PP looks a bit wider, but I'll measure it later to confirm.

                              Weight differences:
                              M42 FW-28.8 lbs
                              M42 clutch assembly-38.5 lbs

                              M20 FW-lightened to 16 lbs
                              M20 assembly-30.4 lbs.

                              The difference is reasonably large, and all said and done, it only cost me $400 worth of parts, machining included. There also appears to be a lot less mass on the outer edge of the M20 FW than the M42 dual mass, so that's probly going to make a bit of a difference as well. It should all be installed by sunday if all goes well

                              EDIT: the friction material on both pressure plates is 3.5cm wide
                              Last edited by gearheadE30; 05-28-2010, 01:59 PM.

                              Project M42 Turbo

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                                #75
                                Pics of some of the progress, in no particular order:








                                Project M42 Turbo

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