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  • My Engine Rebuild

    Hi all, my M3 came with a 2.5L Metric Mechanics rebuilt motor that had issues (stemming back to the initial rebuild, you can imagine how disappointed I was to find that out). With @10k on the rebuild the motor had compression issues, the head was a mess, etc.

    So I decided to make things right and am in the process of having a local performance BMW shop do the work (sent the head to VSR to be worked on). Also adding a lightweight flywheel, new exhaust, short shift kit. Everything being done by the book and has had the best hands on it and best parts in it. Expecting a noticeable improvement in power/performance. Here's a few pics...






  • #2
    Also a ton of info and vids at the shop's IG page: https://www.instagram.com/stories/hi...6939404540186/

    Pretty enjoyable viewing

    Comment


    • #3
      I’m usually too lazy to go over to Instagram but I’m glad I did, good viewing! Looks like your motor is in capable hands.
      1989 Lachs
      1988 Lachs - sold
      1988 DS - sold
      Car blog
      Bay Area M3 FB group

      Comment


      • #4
        It all looks great, I'm sure you will love the result.

        Over all my years of involvement with these cars, I have never heard anything good about Metric Mechanic....so it's not just you.

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        • #5
          Metric Mechanics rebuild...ugh. Surprised it lasted 10k miles. Sounds like you're getting it sorted now. Up and UP

          E30M3 is a Legend

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          • #6
            3 s14's all dyno'd on the same dyno the same day

            First one was all original with zero mods, it put down 167 Hp

            Second S14 was Build by Ben Thongsai, 2.3 with mild port match done by me and I installed 284/276 cams, otherwise stock and it made 207 Hp

            Third was a 2.5 built by Metric Mechanic, It made 187 Hp

            Pretty disappointing Hp number for a 12k 2.5 S14

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            • #7
              Originally posted by bmwdayz View Post
              3 s14's all dyno'd on the same dyno the same day

              First one was all original with zero mods, it put down 167 Hp

              Second S14 was Build by Ben Thongsai, 2.3 with mild port match done by me and I installed 284/276 cams, otherwise stock and it made 207 Hp

              Third was a 2.5 built by Metric Mechanic, It made 187 Hp

              Pretty disappointing Hp number for a 12k 2.5 S14
              what chips were in each car? if the engine(s) are not 'tuned', to each individual build, most importantly the ignition map (where all the power is made with an AFM) who knows what they are.

              what did their area under the curves look like?

              all the power in an S14 is in the head and cams. of course the ported one with cams did better. what cams were in the 2.5? Did it have the exhaust cam as well that they liked to use?

              T

              Comment


              • bmwdayz
                bmwdayz commented
                Editing a comment
                My 2.3 had a iigo chip and the head wasn't ported. Only port matched to the throttle bodies which is very minimal. The 2.5 had a custom burned chip with the evo afm and injectors. The metric mechanic engine was there 250hp 2.5 they advertise on the website. So whatever that 250hp build is supposed to come with is what it should of had.

            • #8
              Ah crap, my car has a 2.5 MM Rallye build too but it runs great with over 12k miles. Guess I should do a compression test before running @ COTA in June…

              Comment


              • bmwdayz
                bmwdayz commented
                Editing a comment
                Even though the MM engine made less Hp it still ran ok.

            • #9
              With the added power this motor will have I've considering changing the diff to a 3.46 LSD, any help sourcing that?

              Comment


              • #10
                Decided on a 3.74 LSD, also having a new ECU put in and new higher volume injectors. Will be dyno'd soon and I'll post the result. Also redid the interior to match the EVO direction the rest of the car has

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                • #11
                  You are going to need a new name - maybe superfastricky, or reallyfastricky, or iamnowbrokebutfastricky

                  Great job on the build.
                  1990 M3

                  Usually it's best not to know how much money you have into your M3

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                  • #12
                    Exterior pic just for fun

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                    • #13
                      From my builder: "The car went to the dyno yesterday with the new injectors + chip tune and ran flawlessly to 8k RPMS making a smidge under 215 Wheel horsepower and 176 Lb / Ft of torque."

                      I'm picking it up next week and am so stoked!

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                      • #14
                        Congratulations your M3 is looking really good and will be a lot of fun to drive.

                        E30 M3 1987
                        Mini Clubman GT
                        BMW E36 323 Msport
                        Toyota Corona
                        KTM 200EXC
                        Honda CB50 (1979)

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                        • #15
                          Originally posted by fastricky View Post
                          From my builder: "The car went to the dyno yesterday with the new injectors + chip tune and ran flawlessly to 8k RPMS making a smidge under 215 Wheel horsepower and 176 Lb / Ft of torque."

                          I'm picking it up next week and am so stoked!
                          Congratulations! Thank you for sharing the pictures. Very exciting.
                          Did you replace the ECU or the “chip”? And what did you decide as far as stock flywheel and clutch?

                          (MM was an ok place 30 years ago. )

                          Comment


                          • fastricky
                            fastricky commented
                            Editing a comment
                            Yes replaced the chip for sure, we suspect the reason the engine had to be rebuilt with so few miles on it was the chip was never upgraded to work with a 2.5L build. Lightweight flywheel. No change to clutch.
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