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SM4 trigger accuracy with more or less teeth?

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  • #16
    Originally posted by Ian View Post

    Is there not a version of the Ford V10 that has 36-1 on the crank which means you have to set it to a non-matching pulse count?
    I failed to immediately see the full implication of his 4 TEV/C. A hasty retreat was called for.

    Chris
    He gets his lap dogs to do his talking for him. Buzzard is a good example.

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    • #17
      Here is tested what Ian said regarding ignition timing during acceleration.
      In this pic I simulated an accelration, one signal i sync pulse the other ignition 1 o/p. The setup is pulse per cycle and set to sequantial ignition, I/P lead trimmed so the ignition matches the sync signal ever 720 degrees. Ignition is set to -Ve.

      This pic is during accelration, here is the first ignition in phase, then little late for two sparks and then in phase. The first ignition is at 1200 rpm and the last is 5000 rpm, I doubt an engine can acceleate this hard but timing is still ok.
      Attached Files
      Last edited by MRMRacing; February 10th, 2008, 12:10 AM.
      Robert Jansson
      MRM-Racing

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      • #18
        The third one looks to have moved more than the second one in relation to the same falling edge of the sync signal ?

        Maybe i'm missing something?

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        • #19
          you where right, it was wrong pic uploaded, I have edited the file and it is now ok, thanks for pointing this out.
          Robert Jansson
          MRM-Racing

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          • #20
            I cant read the time axis. What is the acceleration rate ?

            Chris
            He gets his lap dogs to do his talking for him. Buzzard is a good example.

            Comment


            • #21
              Just above 4100 rpm/s.
              Robert Jansson
              MRM-Racing

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              • #22
                Originally posted by MRMRacing View Post
                Just above 4100 rpm/s.

                I have some datalog here somewhere of a speedway four cylinder at 12000 rpm/s

                Chris
                He gets his lap dogs to do his talking for him. Buzzard is a good example.

                Comment


                • #23
                  This value was manually calculated since the rpm increas was 4100 rpm on 1 sec. I have seen high values in datalogs earlier.
                  Robert Jansson
                  MRM-Racing

                  Comment


                  • #24
                    Originally posted by Ian View Post
                    For RAC with v1.02, if you increase you trigger Events / Cycle but are not using all four ignition outputs you can set one of the unused outputs as a tacho pulse with the correct number of pulses
                    So only ignition outputs can be used to drive tacho??

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                    • #25
                      O/P 8 is normall used as tacho output, but ignition or fuel can be used if not used (for fuel or ignition). The injectors or ignition O/P is set up under the tab "Advanced" in each menu.
                      Robert Jansson
                      MRM-Racing

                      Comment


                      • #26
                        I had a look at my timing with a timing light tonight with all maps at 20deg, At idle it drifts around a little more than i would like.
                        At 1000rpm and the timing set to 20deg it will drift around from 18-26deg and this is happening all the time, you can here the rpm changing with the timing change. The error gets smaller with more rpm and it does retard about 2deg for an instant when the throttle is blipped. Anything over about 1500-2000rpm and the timing is within 1deg.
                        I've alway had a little problem with idle smoothness and this may be part of the problem.

                        The engine is a 2.5L 4cyl subaru with a 6kg fly wheel.

                        I would like to try more crank teeth to see what the result would be. A newer chip would be nice too.
                        No ones got a second hand 1.06 foalting around do they?

                        Comment


                        • #27
                          18-26 degrees , no CPU was ever that bad !!! That seems more like the ignition was running off another table like the idle table.

                          Don't worry about extra teeth until you have changed the CPU.

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                          • #28
                            Ha Ha no this is with "ign angle mean" reading constant 20deg when testing, every map, main, idle, overrun and air temp corrections all set to 20deg. If i blip the throttle from 1000rpm it will retard the timing 10deg befor sorting itself out. If i do that at 2000rpm on it will only retard about 2deg befor sorting itself out again.

                            I tried to take a small video clip of it but it didn't turn out too good.

                            Comment


                            • #29
                              Here's a little video of the timing set at 20deg flat in the ecu. It seems to get better with less advanced but is still bad.
                              There's even a good 1-2deg jitter at any rpm.

                              It also looks better in the video as the frame rate plays around with it a bit i think.


                              I want to wait till next chip comes out befor i upgrade but then i spose i'll want the next one to ha ha.

                              Is there anything fancy planned for the latest ?
                              Last edited by MRMRacing; February 18th, 2008, 10:23 AM.

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                              • #30
                                Yes, I do have some used 1.06 chips.

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