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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 Weiß 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, 02:35 PM.
                        @turbovarg
                        '91 318is, M20B25, T3/T04E 60 trim (18psi), 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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                            This thread is great. Thanks to everyone who's contributed. After reading through it, I'm amazed that my engine (284/272) on a stock b25 has held up d/t my severe lack of knowledge with tolerances/clearances. Round 2 is going to be much better.

                            How many miles should a Schrick 284/272 cam last? I think I'm around 40k, regular oil changes Castrol GTX 20/50
                            09 BMW 328xi touring 6spd
                            05 Subaru Outback XT 5spd
                            87 BMW 325is
                            a few bicycles

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                              Originally posted by LowR3V'in View Post
                              have you seen any power from retarding the cam seeing as allot of people resurfaced/shaved heads but with no adjustable gear.
                              Yes. Apparently the Schrick likes to be ~4° behind. In a racing series you may be docked points for using an adjustable gear, though....
                              john@m20guru.com
                              Links:
                              Transaction feedback: Here, here and here. Thanks :D

                              Comment


                                Figured I'd add to this thread- two 3L M20 cars built by Zionsville Autosport went on a local Dynojet today.

                                Both M20b30s were built using M54b30 internals, pistons shaved down 2mm and then had .0017 of ceramic coating added to the domes. Using a thicker MLS (not totally sure of exact size), compression is supposedly around 12:1. These aren't my claims, just the info I got from Dwight.

                                Car one was stock ecu, car two was Megasquirt. Stock ECU car had a 272 cam and a BBTB, but made significantly less power than the car with Megasquirt.

                                Dwight and I had a bet on what the Megasquirt car would make, I guessed 185/210.

                                Anyway, onto the results. Also, to note, I tried to do an overlay in WinPep but couldn't get it to read right. I have the dyno files that I can send someone if they cared to do an overlay of cars 1&2.


                                Car #1:

                                Runs 1&2 are with stock chip in the stock ECU, runs 3&4 are with an SSSquid chip setup for this configuration of parts. You can see the curve smoothes out and AFRs also get much safer with the squid chip where the stock ECU was going lean.

                                Bolt ons:

                                -IE Billet 272 Cam
                                -BBTB

                                MILLS by Bobbie Morrone, on Flickr





                                Car #2:

                                This car has a PNP Megasquirt setup with a Miller MAF somehow configured in there. I don't know the details of the t00n, but the bottom end is the exact same as car #1.

                                This car has a stock cam, and otherwise doesn't have any mods outside of the standalone, but made much stronger numbers. The tune is crazy rich up until 5K.

                                LILE by Bobbie Morrone, on Flickr



                                Edit: Adding a photo of car #1 because it's a beautiful, extremely low mile Japanese MT2 car.

                                Untitled by Bobbie Morrone, on Flickr
                                Last edited by AWDBOB; 10-23-2020, 06:16 PM.
                                1990 Brilliantrot 325iS Build Thread
                                1989 Zinnoberrot M3 Build Thread

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