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Help with Knocking at 7000RPM

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Old Oct 9, 2007 | 11:10 PM
  #16  
Mr. Evo IX's Avatar
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From: Plano, TX
There's lots of reasons why your car could be knocking. Too much timing, not enough fuel, too much mivec advance up top. But really we dont know which of these it is - or it could be a combination of a few of them or even a mechanical problem. All of this is speculation without proper logs.

3 strong suggestions for the OP.

1. If you'd like to make this map work - post logs, preferably with A/F logged from a wideband. To offer even reasonable advice we need datalogs captured in 3rd gear from 2K - redline. From these we can give you a educated answer as to what is causing your knock.

2. If the first option is not available at this time. I suggest Flashing your stock map on your car until you can do option 1.

3. Get your car tuned by someone who's capable.
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Old Oct 9, 2007 | 11:16 PM
  #17  
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From: Plano, TX
Originally Posted by alan678
Try changing the lean spool feature to shut off at 8k rpms - The stock value is 7k rpms (reason for 8k is that you will never get out of lean spool since you wont rev that high...i hope) It could be the jump from lean spool turning off in conjunction with the fuel mapping in that area that is causing it to knock right at 7k as you describe it...

Also why are your 280-300 load cells leaner than the 220-260 load cells? This could be bad if you ever over boosted....

If he did this he would be even leaner than he is now. That is why the map is leaner up top because somebody was trying to offset the factory rich condition. If you do this make sure and adjust your fuel or you'll be leaner than you already are.
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Old Oct 10, 2007 | 04:07 AM
  #18  
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From: Hermosa Beach, CA
I think the simpliest solution would be to reduce timing by 2 degrees (roughly 1 degree per 3 counts knock) in the appropriate load cell where you're getting the knock, and then maybe 1 degree in the adjoining cells. That should do the trick, though maybe not optimal for power.
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