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ForcedFirebird's m20 dyno thread.

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    #91
    Funny timing, here is a recent project that might be relevant 8^)


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    My M20 Frankenbuild(s)
    4 Sale - Fully Built TurnKey Megasquirt Plug and Play EMS

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      #92
      one tensioner on the timing belt is more than enough....
      89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

      new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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        #93
        Originally posted by digger View Post
        one tensioner on the timing belt is more than enough....
        I don't understand your statement?? There is only one
        My M20 Frankenbuild(s)
        4 Sale - Fully Built TurnKey Megasquirt Plug and Play EMS

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          #94
          yes there is only one but i'm against incorporating additional idlers, tensioners into the Vee belt system for the additional cost, points of failure and maintenance.

          it would make more sense on an M30 which needs the extra space
          89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

          new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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            #95
            Originally posted by digger View Post
            yes there is only one but i'm against incorporating additional idlers, tensioners into the Vee belt system for the additional cost, points of failure and maintenance.
            You threw me on the 'timing belt'. You could run without the tensioner and idler and just use the manual adjusters and would be 100% stock BMW non maintenance parts. it allows to run a newer damper and one that's tuned (if there is any real difference) for the 84mm crank that I am running. I also have a ATI damper for my S54 that I am seeing what I can do for a hub.

            Originally posted by digger View Post
            it would make more sense on an M30 which needs the extra space
            Or a supercharger setup 8^)

            (ignore the alternator holding up the SC, that was just to hold it while checking the SC > plenum > throttles alignment)

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            Originally posted by ForcedFirebird View Post
            Only options ATM are using a 24v damper, which is larger in diameter and has the OlT mark at 2 o'clock vs 10 o'clock (easy fix), will require custom CPS bracket and either change to vee belt damper, or serpentine alternator other oprtion is totally a custom /adapted unit.
            Sorry for derailing your thread I though it was relevant to your post, I will make a new thread
            My M20 Frankenbuild(s)
            4 Sale - Fully Built TurnKey Megasquirt Plug and Play EMS

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              #96
              'Bird this is a great thread. Will be sure to post my dyno run here.
              "And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"

              Das Beast build thread

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                #97
                I'm not sweating it Keith, it's relevant. What did you do for the CPS?

                Right on dvallis.

                john@m20guru.com
                Links:
                Transaction feedback: Here, here and here. Thanks :D

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                  #98
                  Das Beast 2.8L turbo stroker M20

                  See Build Thread page 1 for specs

                  BLACK : 6 psi
                  RED : 10 psi
                  BLUE: 16 psi
                  GREEN: 19 psi

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                  "And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"

                  Das Beast build thread

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                    #99
                    That's a curve I'd love to see in any of my cars. How does it drive, did you get a chance to test it?
                    '85 Alpine WeiƟ 2-door with m20b30 ground up build

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                      It's really well behaved, drivable and fun. I'm getting 5-10 psi boost at partial throttle, so maybe 200-250 HP. At WOT 19 psi the boost comes on like Mike Tyson punching you in the face. Make sure you're pointed in a straight line, hold on and try not to scream like a little girl. :-)
                      "And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"

                      Das Beast build thread

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                        Thanks for that, dvallis. It is very rare that someone posts a dyno printout that good. Usually it's one or two runs just to brag about the peak hp number when the comparison is the real value of a dyno in the first place. I had a little fun with your numbers since I don't get to see this kind of comparison with turbo cars too often. Of course it's not gospel, just for comparison, and forcing linearity is only way to easily display what kind of power increase your build is seeing per added psi of boost (the slope of the line).

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                        Last edited by varg; 03-20-2020, 01:35 PM.
                        @turbovarg
                        '91 318is, M20B25, T3/T04E 60 trim (15psi), megasquirt, coilovers, Z3 rack, cold AC
                        [b u i l d]
                        [Car of the month: April 2018]

                        0c8b7c9527af628a346878feb14bf757

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                          Hey Varg, that's a good way to look at it. We've got a nice study of HP for M20 turbo stroker builds.
                          "And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"

                          Das Beast build thread

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