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How to identify ghost knock

 
Old 05-04-2010, 11:24 AM
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Rules of Thumb I use: If you cannot hear it or feel hesitation in the rpms at those intervals, then it's ghost knock.
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Old 05-04-2010, 11:36 AM
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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.
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.
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Old 05-04-2010, 12:36 PM
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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.
Yeah, but that has been fixed. The O2 sensor in the TP wasn't snug and the metal washer was rattling.

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?
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Old 05-04-2010, 12:58 PM
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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?
Please do order me a set. I think Zo needs a set too.
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Old 05-04-2010, 04:11 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.
Both. It's not only hearing but when it knocks usually there is a little hesitation in the rpms (sort of like a miss-fire)
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Old 05-04-2010, 07:17 PM
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Any word on the ignition values for those cells???
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Old 05-04-2010, 10:05 PM
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Was anywhere from 22-25 degrees advance when the knock counts occurred.
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Old 05-05-2010, 01:04 AM
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sounds like ghost knock.
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Old 05-05-2010, 07:15 AM
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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.
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Old 05-05-2010, 07:21 AM
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There were also several knocks between 3600 and 4400 at 22% throttle (680 mBar) and IGN is between 24 and 28 degrees.
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