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  • #16
    Now is the perfect time to utilize Winlog and it's fastlogging capabilities. No need to search around in VCDS measuring blocks when all the data you need will be presented in one easily readable and user configurable single screen. Look for AFR_REQ value, if it's not fluctuating around and is staying still while car is running idle with warm engine then yes, your closed loop lambda control is off and yes, it can be switched on or off based on LOAD in the software.
    Now when you look at IPW_RAW it might give you hint, why is it so. If it's anywhere near the 1.4XX region then your tuner accounted for your Deka's so at least you got stable idle. Otherwise if the closed loop is enabled, ECU will pull the AFR to 14.7 region, meaning that it will lower IPW to achieve that but these final values already fall into area where the car won't idle.

    Even though wiki suggests to use Winlog 14point7, I would personally suggest to use regular Winlog from devtechnics website as time has passed and the software is now completely freeware with no nag screens anymore and there has been couple of updates since then.

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    • #17
      Yeah, will get into winlog soon. Trying to determine if i have the immo issue to deal with first. Readings suggests that white box is a european thing and i don't see reference to it in my wiring diagrams. The ones applicable to my car don't seem correct tho as they still refer to a 2x2 diagnostic plug but mine is a 97 with the obd plug.... i am pulling the cluster out for another small project on it so i should be able to see if i have that white box or not right?

      and What you're saying if i interpret correctly is that the dekas lose stability below 1.4ms which is what an afr of 14.7 at idle would do so it's possibly open loop to avoid that issue and have a stable idle?

      edit: and if that's the case for injectors, i should be looking for smaller ones then? Been a while since i did injector math.... ug.
      Last edited by ottawa coupe; 17 May 2025, 11:38.
      1993 UrS4...aka the rocket powered living room

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      • #18
        Can't help you with immo stuff as I never had to deal with any of this since my car is 92 S4 with no immo and has 2x2 sockets under the hood. Wiki suggests that the immo box is somewhere near the steering column, behind the dash, so yeah you might be able to see it once you remove the cluster. I would imagine there are pics of it if you search around in google.
        Yes, the injector part is my wild guess not seeing the car or any data, you should ask your tuner if that's the case.
        Your turbo is capable of 420hp so I think the Bosch 0280158117 550cc EV14 ones should be sufficient for this if you are using regular pump gas but don't quote me on that. Maybe someone who has their car running at similar power level can give you a better idea. Dmitri posted known working deadtime values for these injectors to use in motronic, so it's one thing less to worry about.

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        • #19
          Yeah, i dunno. Online calculators suggrst 630 is the right size. That said, the one i used had a lot less inputs than the one i recall using for a project a decade ago...

          Will look into it more.
          1993 UrS4...aka the rocket powered living room

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