2011 Audi A4 - Tuning Question: Knock Retard Degrees Acceptable Range? Sensors

Author Dalbo 26 Jun 2026

It's unusual to get knock when your cruising on the highway unless you're driving up a hill Any tuner worth his salt knows that detonation can destroy an engine and therefore try. The car can and should be 100% knock free

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2011 Audi A4 - Tuning Question: Knock Retard Degrees Acceptable Range? Sensors

Just to make sure it's actually knock and not just false positives. When tuning an engine, many tuners keep a careful eye on knock retard as they run the engine up through the power band Knock retard (kr) is the number that tells you whether your spark tune is safe or quietly destroying your engine

This guide covers how to read it in hp tuners vcm scanner, how to tell real detonation from.

If you are logging the ecu, and when knock occurs, you may try reducing timing by a degree at a time and/ or increasing the lambda by a point so the retard isn't triggered under those. To do this safely, there is a knock sensor to provide feedback and reduce timing when needed The knock sensor can adjust or trim the ignition timing in the tune by a significant amount. Since the kr pid only shows the timing being removed, and not the actual ks activity, there's no way to tell if kr is from actual knock being detected or the dumb predicted burst knock and.

Knock is equally bad under all conditions What is important is to limit knock events with a peak to peak pressure differential above 5bar (criteria for piston protection). This process inherently results in a reduction of overall power output compared to what the engine *could* produce without knock Knock retard = 0 degrees

Built-in knock control

The knock retardation amount is determined by calculating the distortion from the optimal ignition timing, multiplying it by the configured knock retard aggression percentage to determine the desired.

3 to 6 degrees of knock retard hi all, brand new to tuning but have been on the gen 3 and gen 4 ls platform Currently own a 2008 pontiac g8 gt l76 with 77k miles on the odometer 2 to 3 degrees of knock retard and one instance of a 13 degree knock retard for a period of.19 seconds I wasn't aware there was a way to monitor the actual counts of knock in ecmlink

One common strategy is to retard the ignition timing, delaying the spark plug firing to reduce cylinder pressure and temperature, thereby mitigating knock This adjustment typically reduces engine power. Knock retard is the specific amount of ignition timing that the ecu intentionally pulls back (retards) based on the readings from its knock sensors It is the direct, measurable response to the.