Our gauges show knock retard in degrees. It indicates how many degrees of advance are being removed due to the presence of detonation sensed by the knock sensor. This is a very valuable parameter to monitor, as much so as A/F ratio if not more.
Zero knock retard is ideal but not always realistic. My rule of thumb has been to keep it at 3 or below, some say 5 is ok. Any more than that and I'd take steps to reduce it.
Todd
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'04 Silver SRT-4 - S0, S3 turbo, Corsa exhaust.
12.80 @ 115
Aeroforce Technology Inc.
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