Quote:
Originally Posted by razerwire
With electronic fuel injection and knock sensors the computer adjusts to what fuel you run.
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That is correct, however the programmers for the mapping allow for the normal fuel(s).
The processor may not be fast enough to accommodate high octane via the knock sensor like running in a predefined mapping for the available gas.
It would constantly (cautiously=slow) advance and retard timing to make use of, say 112 octane, which cost processor speed and may even result in a trouble code being set (and may place you in the backup program, assuming 88 octane)