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M42 Turbo Build!

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    M42 Turbo Build!

    So I have read just about every M42 Turbo build thread I could find over the past few years, and finally get to build one! I am starting a thread to help keep me motivated and hopefully tap the knowledge of the community. I suppose I should start with the history of the car. I bought a 91 318is about 4ish years ago that was basically stock. It didn't last very long before it got lots of suspension parts, as well as a full respray.

    Pic of car right after respray:



    With the e34 that started the family obsession:



    Few years later, no real major changes or mechanical issues. Electric fan, chip, and some is skirts. Threw a roof rack on for awhile when I was remodeling a couple rooms in my house and was in work truck mode!



    I bought a M42 that had jumped timing to build on the stand so I could drive my car as long as I could without tearing it apart, since it has been (knock on wood) extremely reliable for an unknown miles 23 year old car that is driven hard.


    I happened to stumble across this beauty on craigslist however and made a somewhat impulse buy that has proven to be a ton of fun in Michigan winters:



    A 91 325ix (auto :() that will serve as the daily from now on. The 318 can now sit as long as it needs to once I am ready to swap the motor in!

    Now to the actual turbo fun!

    Stripped the motor apart and found lots of loose chunks that I am assuming were not designed to be there. As well as some nice dents on the pistons from the valves:





    Some of the things found inside:






    Sooo the plan now is to take the block to an engine builder to get bored.
    From there I believe I have an idea of what the gameplan is, but am open to suggestions and feedback! I would like to shoot for somewhere north of 300 HP, but would like to build the motor to be stronger than the HP it puts out since I would like to drive it for more than a few months. I plan to have an engine builder polish and balance the OEM Crank and Rods.

    Parts list:
    Stock Crank
    Stock Rods
    CP Forged Pistons (85mm)
    Turbo Cam
    SDS standalone (already purchased)
    ARP Hardware
    MLS Gasket
    Garret GT28 (15ish psi?)
    Tial Wastegate
    BOV
    Biggest Intercooler I can fit

    I am unsure about what exactly I am going to do for the head. I figured port and polish, but was unsure what stock components would be strong enough or flow well enough for my goals. I will do lots of research between now and when I am ready to make those decisions, as well hopefully get some input from the M42 Turbo Gurus. I am all about building it right with the correct strong parts, but don't want to waste any more money than I already am! Should be a long ride, but hearing that turbo spool and spanking some expensive cars in my little E30 will be worth it!

    Let the hate/love/comments/bankruptcy/general conversation start!
    Last edited by elcoy; 01-20-2015, 12:38 PM.
    The Lineup in order of appearance:
    91 535i
    91 318is 5 Lug/E46M3 Brakes
    91 325is w/ S52
    88 Vert Plastic Bumper Swap
    88 M3 ;D
    91 325ix 5 speed
    89 Vert Royalblau Metallic
    73 2002
    1986 325es --> is swap Rallycross Car!!
    1995 Chevy G30 Tow Rig... *I SOLD A CAR!!*
    1993 525i Granitsilber Metallic Touring

    Need a 91 M5 bad but wife would shoot me...twice

    *UPDATE: got a 93 M5 and still alive

    1972 Jeep Wagoneer
    1975 2002 five speed

    Check out:
    Elhartspeedshop.com


    sigpic

    #2
    I'll be following along. I'm collecting the pieces for a Megasquirt setup on my M42 with the end goal of turboing it in the 220-250whp range this year. :)
    91 318is - Gone
    16 VW GTI
    07 Aprilia Tuono

    Comment


      #3
      You have an E30 M3(according to your signature), why waste your time with the 318is? IX in the winter, M3 in the spring, summer and every other chance you get. That is what I would do.
      How to remove, install or convert to pop out windows
      http://www.r3vlimited.com/board/showthread.php?t=297611


      Could be better, could be worse.

      Comment


        #4
        My father and I share a R3V account since we do pretty much all car things together. That's really more his car, and also is in need of some work since it had been sitting in a dirt floor barn for the last 6-7 years when we found it. It runs but needs some love! Also we may have a slight addiction....oops
        The Lineup in order of appearance:
        91 535i
        91 318is 5 Lug/E46M3 Brakes
        91 325is w/ S52
        88 Vert Plastic Bumper Swap
        88 M3 ;D
        91 325ix 5 speed
        89 Vert Royalblau Metallic
        73 2002
        1986 325es --> is swap Rallycross Car!!
        1995 Chevy G30 Tow Rig... *I SOLD A CAR!!*
        1993 525i Granitsilber Metallic Touring

        Need a 91 M5 bad but wife would shoot me...twice

        *UPDATE: got a 93 M5 and still alive

        1972 Jeep Wagoneer
        1975 2002 five speed

        Check out:
        Elhartspeedshop.com


        sigpic

        Comment


          #5
          Nice car! Where in MI are you?

          Comment


            #6
            Badass family! Interested to hear how this thing fairs against the s52 swap, since people always seem to debate whether to turbo their M42s or swap them for an s5x. Will definitely be watching this one.
            diamantschwarz 1991 318is

            Comment


              #7
              Grand Rapids area!
              The Lineup in order of appearance:
              91 535i
              91 318is 5 Lug/E46M3 Brakes
              91 325is w/ S52
              88 Vert Plastic Bumper Swap
              88 M3 ;D
              91 325ix 5 speed
              89 Vert Royalblau Metallic
              73 2002
              1986 325es --> is swap Rallycross Car!!
              1995 Chevy G30 Tow Rig... *I SOLD A CAR!!*
              1993 525i Granitsilber Metallic Touring

              Need a 91 M5 bad but wife would shoot me...twice

              *UPDATE: got a 93 M5 and still alive

              1972 Jeep Wagoneer
              1975 2002 five speed

              Check out:
              Elhartspeedshop.com


              sigpic

              Comment


                #8
                Sub'd. M42's are cool motors, can't imagine it turbo'd north of 300hp. Keep the updates rollin!
                1991 325i Calypso Coupe

                Like Grandfather, Like Father, Like Son
                BMW

                Comment


                  #9
                  Nice car! I like where this is headed.
                  '90 325i - 5 speed coupe
                  '05 330ci 6MT ZHP

                  Comment


                    #10
                    Your doing what I hope to do at some point in the next few years... Once I can get some money in the bank
                    98 M3/4/5

                    Comment


                      #11
                      I'm a fan of the M42. Interested to see where you take this.

                      Sub'd

                      Comment


                        #12
                        Cool, sub'd

                        Comment


                          #13
                          Sub'd!

                          Comment


                            #14
                            in

                            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


                              #15
                              Dropped the block and crank off at the engine shop to get magnafluxed for cracks, as well as the head to get ported and polished. Could be awhile as he is busy building massive drag motors. The M42 looks almost funny in his shop next to huge V8s! Sorry I forgot to take pictures but am going to drop the rods off next week sometime so I will have to sneak some 'before' pictures!
                              The Lineup in order of appearance:
                              91 535i
                              91 318is 5 Lug/E46M3 Brakes
                              91 325is w/ S52
                              88 Vert Plastic Bumper Swap
                              88 M3 ;D
                              91 325ix 5 speed
                              89 Vert Royalblau Metallic
                              73 2002
                              1986 325es --> is swap Rallycross Car!!
                              1995 Chevy G30 Tow Rig... *I SOLD A CAR!!*
                              1993 525i Granitsilber Metallic Touring

                              Need a 91 M5 bad but wife would shoot me...twice

                              *UPDATE: got a 93 M5 and still alive

                              1972 Jeep Wagoneer
                              1975 2002 five speed

                              Check out:
                              Elhartspeedshop.com


                              sigpic

                              Comment

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