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Thread: Head Cam Intake ls1 2002 trans am

  1. #431
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    fixed all of the recent problems. Now I just have a quick question about possible false knock. So I took a drive in the trans am today and everything was running as it should, towards the end of my 30 minute drive I randomly got a knock retard of 5 degrees in a mid load operating condition where I dont normally have problems. What do you guys think?
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  2. #432
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    What do I think?... I think you need to look at your cylinder charge and re-consider what you would classify as a "mid load operating condition". I think you've also got a lean tip-in. Yeah, I think that the knock is probably real.

  3. #433
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    Yeah it actually is kind of high load isnt it lol. Well besides that, how do I get rid of a lean tip-in and avoid this knock region? Also, should I still retard the timing or should fixing the lean tip in problem fix the KR issue?

    I was thinking because I am speed density, I could just richen up the surrounding cells in my VE table and pull some spark in the neighboring cells for my high octane spark table. I am not sure if this will solve it though.

    Lastly, how bad is 5 degrees of KR? is that substantial knock? what is the limit of LS1s with KR?

    Thanks for the help!

  4. #434
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    Hey guys another KR issue, as I was leaving from a stoplight I got 7.7 degrees of KR because I let the clutch out too fast, RPM dipped, and it just stumbled hard. The KR carried into surrounding cells but it started at 600 RPM as seen. Is this real KR? and should I be worried about it due to the amount of it happening but at very low loads? I normally never have KR problems besides this.
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  5. #435
    Joe (Moderator) joecar's Avatar
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    Looks like it might have been real (did you hear it...?) and then the decay rate is too slow so you can't see if it knocks again.

    Maybe try some burst knock retard (preemptive retard based on load rate) to see if it helps.

  6. #436
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    I did not hear anything to make me think its knock but then again my exhaust is pretty loud.

    So the decay rate is the reason why I have KR in multiple cells?

    What would burst knock retard do and what should I do with it?

    Could KR of that magnitude hurt my engine at those low RPM and loads?

  7. #437
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by oreobadr View Post
    I did not hear anything to make me think its knock but then again my exhaust is pretty loud.
    Make sure exhaust is not banging on chassis.

    So the decay rate is the reason why I have KR in multiple cells?
    Yes, you can see it decaying very slowly (takes about 4 seconds).
    It decays so slowly that it won't knock again...
    if the decay was quicker, any real knock would immediately show up again, making the KR waveform look like sawteeth (when you see this you know it is real knock).

    What would burst knock retard do and what should I do with it?
    BK enables when the load suddenly goes high (i.e. cylinder airmass exceeds the threshold), it then subtracts some timing in anticipation of knock.
    BK has these tables:
    B6210: this is the cylinder airmass threshold.
    B6212: this is subtracted from current spark timing.

    BK is designed to preempt knock in situations where a very sudden high load occurs.

    Could KR of that magnitude hurt my engine at those low RPM and loads?
    If it happens very frequently, then yes; if it happens occassionally, then no; you're probably ok.
    Last edited by joecar; July 27th, 2017 at 06:21 AM.

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