How to identify ghost knock
05-04-2010, 10:36 AM
#12
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Originally Posted by EliteTuning,May 4 2010, 01:24 PM
Rules of Thumb I use: If you cannot hear it or feel hesitation in the rpms at those intervals, then it's ghost knock.
05-04-2010, 11:36 AM
#13
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Originally Posted by gernby,May 4 2010, 01:08 PM
Didn't you say that you were hearing some sort of rattly noise when you start the car? Did you order a set of the colder plugs? I have a set of Denso IK24's that you can try.
Damn, I keep forgetting about the plugs. I'm going to try the NGK BKR8E-11's and then switch over to the iridiums if they prove beneficial. Did you want me to get you a set as well?
05-04-2010, 11:58 AM
#14
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Originally Posted by S2Dave,May 4 2010, 02:36 PM
Damn, I keep forgetting about the plugs. I'm going to try the NGK BKR8E-11's and then switch over to the iridiums if they prove beneficial. Did you want me to get you a set as well?
05-04-2010, 03:11 PM
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Originally Posted by gernby,May 4 2010, 10:36 AM
When you are talking about hearing knock, you mean when it's on a dyno inside the shop, right? I don't think I would ever rely on my ability to hear knock on the street.
05-05-2010, 06:15 AM
#19
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Looking at the datalog from Dave's car when it got 21 knock counts in a few minutes, the IGN value was -2 to -4 degrees at 1200 RPMs and 550 mBar (idling). I believe there was 2 degrees of retard on cylinder 2 also, so that's a total ignition advance of -4 to -6 while idling.