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  • Injector Deadtime

    Hi does anyone have the injector deadtime values for original rs2 injectors?

    Which strategy is better to be used in vems, traditional or simplified?

    Thanks for help
    Cheers

    Murat

  • #2
    Rep injector I used Traditional Idel 860 rpm 0,192,4080,544

    Convert deadtime
    http://www.vems.hu/wiki/index.php?pa...rimentalBuilds

    http://www.vems.hu/wiki/index.php?pa...njectorOpening

    http://www.injectordynamics.com/ID1000.html
    Last edited by KRIENG; 4 December 2012, 03:39.

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    • #3
      Here´s a video of how Andrey configures deadtime. ( In Russian )

      http://www.youtube.com/watch?v=SbPqb...lkPtg&index=11
      Audi S2 Avant - 600whp

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      • #4
        i used simple settings for rs2 injectors and dekas. no problems there.
        once i got the EV14 i had those values from the shop so i now use the deadbands from there. VE map had to be completely redone

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        • #5
          8v 1.867
          10v 1.173
          12v 0.747
          14v 0.480
          16v 0.288

          If VE map had to be completely redone, it means the injector latency was earlier "encoded" into the VE map.
          If your dead time is correct and the injectors are fairly linear, then the VE map will not need changes when you change your injectors.

          Same goes for Motronic and it's fuel map.
          http://tuner.ee - http://www.facebook.com/tuner.ee

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          • #6
            I changed size and type Dmitri. Not just size. + the way vems manages the injectors is different when using the battery compensation as is rather than the simple v vs deadtime and that is why the map had to be redone as the original settings were generic but still work regardless.

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            • #7
              Originally posted by A80Avant View Post
              I changed size and type Dmitri. Not just size. + the way vems manages the injectors is different when using the battery compensation as is rather than the simple v vs deadtime and that is why the map had to be redone as the original settings were generic but still work regardless.
              VE is something to do with the engine, not the injectors.
              Of course if the ECU is unable to model the injectors correctly, you will need to compensate for it via other means, and it is only possible to linearize injectors using dead time and size alone, if they are very linear.

              In old M2.3.2, you can only have a 100% nice fueling map with request matching actual with linear injectors such as EV14's. If you use for example Dekas, which are not linear down low, then it is impossible to keep the map the same, and it has to be changed too.
              This is due to the fact that there is no sophisticated fuel injector linearization...

              On newer Bosch systems, like ME7, the fuel system has an additional linearization map, which is expressed in milliseconds (IPW) x rpm. There it is possible to completely linearize the fuel system non-linearity for every operating point, so the ECU can accurately deliver target lambda.
              This also means that when you change injectors or fuel pressure you must only really adjust the module that is responsible for converting target lambda to injector pulsewidth...

              Long story short - I agree that in your case (Dekas->EV14) it would be impossible not to change the VE map. But I think in the future, if you decide to switch to bigger EV14's you should get away with changing injector size and latency only - if currently they are correct of course.
              http://tuner.ee - http://www.facebook.com/tuner.ee

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              • #8
                They are currently correct as they were with the dekas.

                Vems is for dummies. I let the ecu deal with pwm and latencies and me interfering as less as possible. I had my target lamda always reached with minimal to no corrections on both occasions its just that as i switched to the simple volt strategy, the ecu gave me the impression that there was a lot more to do to get the map on track.

                If i ever were to switch on larger ev14 with similar deadbands, all i would likely have to do is change 1 number and thats it.

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                • #9
                  Anyone has got deadtimes (8-16v) for stock AAN injectors?

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