Quote:
Originally Posted by dadasracecar
The general rule of thumb is that you pull timing when significantly increasing boost to mitigate knock. If you're just raising (doubling) boost and adding fuel any car will knock. Relying on the knock sensor to pull timing after the fact is reactive and bad because your engine will suffer that knock event - possibly every time you go into that max boost situation. If a piggyback pulls timing when raising boost the car (hopefully) won't knock under high boost and the ecu controls the timing as normal. It may advance or retard the timing but it will do so using it's full range rather than immediately pulling a bunch from a big knock event caused by doubling the boost and leaving timing as it were.
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First you say you think the JB3 is relying on the knock sensor to pull timing, but then you say that doing that will pull a bunch of timing. If it pulled a lot of timing (as in a knock event) there's no way we'd be seeing the kind of power gains that are being posted.
Also, in contradiction to your earlier statements, if the ECU is pulling timing due to a knock event, why wouldn't the OBDII logs be accurate?
Is it your position that the ECU is pulling the timing, or not? You can't have it both ways. Either the ECU is being tricked through manipulation of the crank sensor, and the JB3 is controlling timing that way, making the logs invalid, or the JB3 is relying on the knock sensor to pull the timing, and the logs will show it. Please clarify exactly what your position is. :iono: