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Better datalogging using the stock ECU

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  • #46
    I would be quite interested in taking a look at your commented .idb files if you are willing to share?
    I completely understand if you want to keep the results of your rce to yourself.

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    • #47
      Originally posted by Nuvo View Post
      I would be quite interested in taking a look at your commented .idb files if you are willing to share?
      I completely understand if you want to keep the results of your rce to yourself.
      I will probably post that someday...
      I'll send a PM
      http://tuner.ee - http://www.facebook.com/tuner.ee

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      • #48
        There is some impressive geeking taking place
        Panthero Coupé quattro 20vt
        Indigo ABY coupé
        Imola B6 S4 Avant

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        • #49
          sigpic
          1991 Audi S2 3B - 2.5 Stroker engine
          1997 A6 2.5TDi quattro avant - C4
          1976 RD250E / 350LC cafe racer

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          • #50
            Well, I am getting about 49-52hz from it with 12 values on the bench.
            Need to finish up the Winlog driver and field test it.
            http://tuner.ee - http://www.facebook.com/tuner.ee

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            • #51
              Winlog driver finished.
              Getting 12 values at a steady 50hz atm.
              Increasing or decreasing the amount of values does not seem to have a significant effect on the data rate.

              Field tests tomorrow.
              http://tuner.ee - http://www.facebook.com/tuner.ee

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              • #52
                Alright, so tried it on a running car, with some help from someone who actually has a 2.2T...

                At first it did not work above 2000 RPM.
                Everything went haywire.

                I then remembered that there is some sort of threshold (mappable) in the ECU and it is used to determine whether to run logic.
                Stock it is 2000 RPM, after setting it to 10200 RPM the logging works perfectly.

                However, those routines that are limited by that constant are pretty large, and while the ECU works fine, it's calculations are a bit slowed down by this in theory.
                No idea if it is even noticeable (car revs fine and everything works), but someone did put that constant there for a good reason.
                I also don't really need any of that stuff to run for my routine to work, so it makes me think that something breaks something else somewhere.

                So, I am going to simulate some RPM on the bench, and try figuring out what I need to disable for it to work...
                http://tuner.ee - http://www.facebook.com/tuner.ee

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                • #53
                  Just to give you an idea, how detailed this is.
                  This is cranking and starting the engine, 1.5 seconds:

                  http://tuner.ee - http://www.facebook.com/tuner.ee

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                  • #54
                    Sounds like you're really making progress now

                    Specification creep would warrant a WBO2 and EGT probe input too, if possibe
                    Cheers'en, AndyC
                    1994 ABY Coupe - Projekt Alpinweiss

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                    • #55
                      Can't do EGT...
                      Loggable linear 0-5V AFR input is piece of cake
                      http://tuner.ee - http://www.facebook.com/tuner.ee

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                      • #56
                        Is that because different thermocouples are calibrated differently?
                        Cheers'en, AndyC
                        1994 ABY Coupe - Projekt Alpinweiss

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                        • #57
                          Because they are resistance based and the ECU only has spare 0-5V 8 bit ADC's.
                          If you can manage to give a such voltage, so that the result after running through the EGT probe is in 0-5V range, be my guest.

                          Also, for AFR inside ECU you can do this:
                          http://14point7.com/SLC-OEM.php

                          It's also pretty much pointless to log EGT. It is something that you can easily see on a gauge and check it a couple times. It's not real time data that you need to know where it exactly happened...
                          EGT is checked in a long high gear pull and basically it is either too high or not.
                          http://tuner.ee - http://www.facebook.com/tuner.ee

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                          • #58
                            Demo from my friend in Poland:



                            http://tuner.ee - http://www.facebook.com/tuner.ee

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                            • #59
                              Well done. The increased sample rate greatly improves the clarity of the graphs and the responsiveness of the virtual instruments.

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                              • #60
                                Originally posted by prj View Post
                                Because they are resistance based and the ECU only has spare 0-5V 8 bit ADC's.
                                If you can manage to give a such voltage, so that the result after running through the EGT probe is in 0-5V range, be my guest.
                                ...
                                Does this work?
                                http://shop.vems.hu/catalog/amplifier-dsub9-p-129.html
                                Just i guess
                                Audi UrS4 609hp/846Nm @ wheels
                                10.911@210, 1km 268km/h, 1mile 295km/h
                                FATS 2,30 sec

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