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Lost in a sea of tuning... (Ostrich 2.0)

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    #46
    So, this is strange.
    I had the emulator running while my son drove us over to the mechanic so I could use the lift to change the master brake cylinder (and then bleed the brakes).
    The emulator is not changing RPM cells with acceleration.
    The tachometer is working.
    Does the tach get its signal from a source than the ECU?
    https://www.youtube.com/watch?v=td8F0Y40d7w

    I will futz with the connectors under the intake manifold. And try a different CPS.

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      #47
      Tach is driven by ECU. If it was not tracking crank position or speed, it would not run at all. I would run this observation by Sssquid aa it could indicate a bad flag somewhere in the code.

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        #48
        So I tried the stock 173 tune, and that works as expected (in terms of the RPM values changing).
        I also tried a Dinan tune I bought some time ago. That also worked as expected. (I was surprised that only the WOT maps were changed.) So, it is not much of a tune. But, this verified that process of reading the chip works.
        The SSSquid tune has trouble with idle and has to be revved up to 2K RPM to avoid killing the engine when taking off.

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          #49
          Definitely provide that feedback, he should get it sorted out pretty quick.

          Yeah, Dinan E30 tunes are pretty barebones.

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            #50
            Jay at SSSquid also said the compression ratio was 15:1 based on static compression numbers.
            He is also suspicious of my Amazon NewYall 19Lbs. injectors (I didn't even notice they weren't Bosch.)

            I swapped in the previous M20B25 and got the car back today. It is so nice to be able to rev smoothly to 6K RPM. It is using the same harness and sensors. The injectors are the M50 injectors I had installed at one point.

            So, now I will try to figure out why the static compression is so high, and what the dynamic compression is.

            Can anyone recommend a degree wheel that will fit the M20?
            I am also looking for a burrette to CC the cylinder head and piston.

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              #51
              Ha wow, 15:1. It's a very good thing that you have it out of the car and will be digging in. With any luck you'll find some conclusive results. Post pics!

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                #52
                an engine like this should run "fine" as in no cutouts or missing on bone stock ecu with a set of 19 or 21lb injectors (i.e. prorata the fuel requirements) it wont be optmal from a perfromance perspective, if it doesnt there are issues with sensors, wiring, FI componentry etc IMO rather than the "mapping" (light knocking aside).

                the compression numbers are a bit high but its not close to 15:1 static lol, its a cam timing thing. A budget 2.8 with dbilas 276 is about 205 psi runs exceptionally well. this is a bit higher compression than a budget 2.8 so seems to be the in the ballpark but the cam is a little small (did it come with a cam card?). my rule of thumb never ever buy a cam without seeing the cam card what does 274 even mean? is it 274 with zero lash or is 274 at 0.050" or 1mm) then theres a regrind 274 vs new grind

                to be honest an engine like this seems to have anough investment it needs a proper ECU, it still needs the harness to be good, a few basic sensors carried over, fuel delivery system and igntion componets in good order but no narrowband o2, AFM, TS nonsense.
                Last edited by digger; 09-26-2020, 05:10 PM.
                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

                Comment


                  #53
                  Yeah, I was kind of counting on the engine running better than it did on the stock management.
                  I tried 2 different sets of 19 Lbs injectors and a set from an M50 engine.

                  When I swapped the M20b25 back in I re-used the same harness and all sensors except the oil pressure sensor. I also used the same cap and wires, and harmonic balancer on the front of the engine. And the M50 injectors. And the same AFM. I did change the intake manifold from an extrude honed one to a stock one (but I swapped over the fuel rail). (Hmm, maybe I should pressure test the intake manifold to make sure there are no holes in it, although a smoke test did not show anything.)
                  Each engine had its own set of plugs.

                  The M20b25 runs strong to redline at all throttle positions.

                  The cam is likely a regrind. ( I did not get a timing card.) Probably this one:
                  https://bimmerheads.com/products/m20...grind-camshaft


                  digger what degree wheel do you use? Did you make it?
                  Do you think this one would work:
                  https://www.amazon.com/Rotary-Valve-...NsaWNrPXRydWU=
                  I was thinking I could glue some magnets to the back to stick it to the crank pulley.

                  Comment


                    #54
                    Google image and print and double sided tape to the vibration damper
                    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

                    Comment


                      #55
                      Originally posted by digger View Post
                      to be honest an engine like this seems to have anough investment it needs a proper ECU, it still needs the harness to be good, a few basic sensors carried over, fuel delivery system and igntion componets in good order but no narrowband o2, AFM, TS nonsense.
                      This pretty much sums it up. Any standalone EMS should be able to get the job done pretty easily in this case.

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