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(PICS) KNOCK when your LTFT's lean out...check it out

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Old Oct 13, 2009, 08:17 PM
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(PICS) KNOCK when your LTFT's lean out...check it out
If you want to see knock here it is...once I had this knock happen feels like the car falls on it face or you are getting major clutch slippage. However look at the AFR from the AEM UEGO. CBRD is fixing my maps, not sure why this is happening.

Just want to show what real knock looks like... people start yelling wolf when they get 1-2 counts. Try 33-36 knock. Once you start getting 50-70 you are having serious problems.

Lean but no knock...


Lean knock....


Lean still knock...
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Old Oct 13, 2009, 08:20 PM
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can you add load or boost psi so we can see when it happens relative to load?
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Old Oct 13, 2009, 08:24 PM
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Originally Posted by nothere
can you add load or boost psi so we can see when it happens relative to load?
That I cannot. I am tuned via COBB AP. So I can only show you what happens up to 125KPA which about 19PSI. I can't have MODE23 enabled to show you the other options.

However, hollywood_x suggest it might be signs of the stock clutch slipping.
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Old Oct 13, 2009, 08:29 PM
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19 psi answers my question,

does this happen on a hot motor or early in the drive?


13 is a little lean for 19 psi , no?
Last edited by nothere; Oct 13, 2009 at 08:31 PM.
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Old Oct 13, 2009, 08:38 PM
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36 is max knock count. At least it was with Evo 8/9.

13.7 AFR is a bit extreme for -6 fuel trim. Have you checked you relay? Is this WOT?

- Bryan
Last edited by GST Motorsports; Oct 13, 2009 at 08:40 PM.
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Old Oct 13, 2009, 08:39 PM
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36 is max knocksum

also as long as your LTFT's arn't maxed out then you arn't really running lean - since the STFT+LTFT will ensure you run stoich
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Old Oct 13, 2009, 08:43 PM
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Hmmm....so this could possibly be a slipping clutch that causes this...
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Old Oct 13, 2009, 08:44 PM
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Originally Posted by Clipse3GT
Hmmm....so this could possibly be a slipping clutch that causes this...
You would see a slipping clutch in the RPM log. It wouldn't be a linear progression but shoot up then down and catch.

If it was a real 30+ knock count you would hear it, and possibly see a rod in your rearview...
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Old Oct 13, 2009, 08:48 PM
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Originally Posted by Clipse3GT
However, hollywood_x suggest it might be signs of the stock clutch slipping.
logging rpm & speed could help identify slippage if you can get a high resolution
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Old Oct 13, 2009, 08:54 PM
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Originally Posted by GST Motorsports
You would see a slipping clutch in the RPM log. It wouldn't be a linear progression but shoot up then down and catch.

If it was a real 30+ knock count you would hear it, and possibly see a rod in your rearview...
No rod through the side... car runs fine. Just felt like the car dropped on it's face. Kind of felt like a slipping clutch...
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Old Oct 13, 2009, 08:56 PM
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Originally Posted by Clipse3GT
No rod through the side... car runs fine. Just felt like the car dropped on it's face. Kind of felt like a slipping clutch...
Well I would imagine the timing being pulled from the ECU thinking there is 36 knock counts would be substantial enough to make the car feel like it's falling on it's face. take a look at the timing log
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Old Oct 13, 2009, 09:02 PM
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Here is the log from this run...

http://www.mediafire.com/file/wmznzv...3_19.16.58.csv
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Old Oct 13, 2009, 09:10 PM
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Originally Posted by Clipse3GT
Yup it went from 28* to -7* back to 40* with 33 knock counts. 4000 rpm, 50% TPS.

That would make the car fall on it's face.
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Old Oct 13, 2009, 09:14 PM
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Originally Posted by GST Motorsports
Yup it went from 28* to -7* back to 40* with 33 knock counts. 4000 rpm, 50% TPS.

That would make the car fall on it's face.
So is that clutch slipping or the car running lean???
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Old Oct 13, 2009, 09:16 PM
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Originally Posted by Clipse3GT
So is that clutch slipping or the car running lean???
See post #8
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