Quote:
Originally Posted by John at J&S
But one may ask a question, why do you have to intervene at all? That's the brute force approach.
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Nominally, we don't have to intervene. We aren't stupid.
We tune the car so there is no knock in typical operating conditions with race fuel. But, we use the knock sensors in case there is bad/incorrect fuel or the heads get too hot or some other event (e.g., ignitor failure, broken coil wire, etc.)occurs that causes knock. We can detect the knock and increase fuel, back off timing, or both so there is no more knock. If we get x amount of knock events, we display a warning on the dash. Heck, we even put the engine in a limp mode if things are really bad.
It's easy to look at the ECU logs to see if we are getting any knock events under nominal conditions. If we did, we would retune the car so we did not. So far, we aren't getting knock events under nominal conditions. so we are comfortable with our tune.