2 logs with different data 13 WRX
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This is a discussion on 2 logs with different data 13 WRX within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; Hi everyone. So last night I did my first data log when I got out of work at 2am after ...

  1. #1
    Registered User punkndrublic04's Avatar
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    Please help me with some logs!!!

    Hi everyone. So last night I did my first data log when I got out of work at 2am after flashing the Cobb Stage 1 93 OTS map and everything seemed good. No Feedback Knock and no Fine Knock Learn. So tonight I got out of work at the same time and did the same pull, on the same part of the highway and I have some Feedback knock from ~2600rpms up to ~3900rpms. Conditions were almost identical too - ~45 degrees and wet/damp. Yesterday I had around 10 miles on the tune after flashing and today's pull I had around 65 miles on the tune.

    I'm kind of at a loss at what the difference could be from last night to tonight. If anyone can take a look at my logs and help me out it would be greatly appreciated. I should have done another pull but the highway gets all hilly after that good, flat stretch. Could this just be some "noise" that the knock sensor picked up? I remember reading that in lower RPMS the knock sensor can pick up some noise that it thinks is "knock". If this is correct and is just "noise" then at what RPM/range should I be concerned that is actual denotation?

    Last nights log:
    https://docs.google.com/spreadsheet/...kE&usp=sharing

    Tonights logs:
    https://docs.google.com/spreadsheet/...VE&usp=sharing

    Thanks in advance for the help!
    Last edited by punkndrublic04; 05-26-2013 at 08:32 PM.

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  3. #2
    Registered User punkndrublic04's Avatar
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    So I took some more logs today.

    This log was from this morning where I had feedback knock during my 3rd gear pull (same log posted in the OP):
    https://docs.google.com/spreadsheet/...FE&usp=sharing

    This log was from this after noon on the highway. I went from 5th to 4th and went WOT. I have some feedback knock that is present when I first went WOT and then goes away. If I understand correctly this is normal and may happen from time to time when going WOT? A little later in the log I did the same thing and no FDBK or FNL was present:
    https://docs.google.com/spreadsheet/...Hc&usp=sharing

    This log is a 3rd gear pull I did later in the day and I had some FNL towards the middle of the pull:
    https://docs.google.com/spreadsheet/...2c&usp=sharing

    And the last log was an hour and 1/2 later with FNL but it seems as if the ECU isn't pulling as much timing which makes me think that is it "unlearning" that point in the RPM range:
    https://docs.google.com/spreadsheet/...mc&usp=sharing

    So from these logs can anyone help me understand what is going on here and if everything looks ok?

    Thanks.

  4. #3
    Moderator Donkey's Avatar
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    It's not that big of a deal. All cars knock a little. That's the whole point of having active timing. Anything over -1.5 that is multiple cells I might go in and change in the ROM,but after I have ruled out crappy gas. There is a TON of variables that come into play. Where you using the same tank of gas for all the logs?
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  5. #4
    Registered User punkndrublic04's Avatar
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    Yes I've been on the same tank of gas since I went stage 1. I always use Mobil gas and it's from a high volume gas station. It seems to me like I had that 1 knock event and then some FNL on a few more pulls but the ECU started to "unlearn" them.

    I just want to make sure that you can sometimes get some feedback knock when going WOT at the start of a pull like I did in the log when I downshifted from 5th to 4th.

    Thanks for the reply.

  6. #5
    and the Funky Bunch Calvinball's Avatar
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    Quote Originally Posted by punkndrublic04 View Post
    I just want to make sure that you can sometimes get some feedback knock when going WOT at the start of a pull like I did in the log when I downshifted from 5th to 4th.
    Yes.
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