Quote:
Originally Posted by PA FAST
Is that still true for modern engines that "Recommend" Premium? I thought the computer can detect the octane you're running and adjust to handle a lower octane without damaging the engine.
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I've heard this "claim" but I"ll believe it when I see it. Compression is compression and higher compression requires higher octane to avoid detonation.
The computers may be able to sense the ping with knock sensors and retard timing to compensate, but there will have to be some limit to this effect. My 2002 4Runner has this capability, however when I supercharged it it pinged like crazy until I added a piggy back computer to manually pull timing out in the areas the computer couldn't correct.