Quote:
Originally Posted by jedibow
And also Rice, yes ALL OBD II ECU's have a octane parameter built into the factory ECU system, whether it is determine proper ignition, fueling, or different alpha N calculations (Honda) for the cylinder events. Yes different automobile manufacturers have different ways of dealing with knock, but ALL have a sub routine to change the octane count on the fuel once it is detected.
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Jedibow: in asking if all OBDII ecu's do that, I wasn't referring to ignition management via knock control. That I knew. I was referring to auto-advancing to take advantage of higher octane than what the car was designed for. My 1996 Ford Econoline Van designed to run on 85-87 octane doesn't seem to "figure it out" when I've put in 93 octane and I have a sneaking suspicion that
most OBD2 ECU's are not "adaptive" like the Camry 2GR. The discussion wasn't based around retarding once detecting knock, it was based around automatic detection of higher octane for specific design and subsequently automatically altering ignition timing.
All OBDII ecu's retard timing when knock is detected. Check
All OBDII ecu's on cars designed for 87 octane automatically detect and advance timing when higher octane is introduced than what the car was designed to run on? I don't think that's true.
But..
