Quote:
Originally Posted by mikezmoney
What's the main benefit with higher octane in there cars?? Is it a significant driving difference? Faster? Smoother?
|
Many high compression, turbo, or forced induction production engines are designed to operate most efficiently with 93 octane, including the G8x series. For the G8x 93 octane is recommended and 91 octane is required. If you go below 93 octane the engine sensors will do things like retard the timing and change the fuel maps to prevent engine knocking (pre-detonation). This will decrease performance because the timing and fuel is not optimal for the engine.
If you go below 91 octane the engine will still run, but very poorly as the timing is retarded beyond normal parameters of functioning to prevent the pre-detonation and you'll likely introduce said pre-detonation.
Pre-detonation is VERY bad for an engine.
Also note that putting in a higher octane fuel than what is recommended by the manufacturer will generally not improve performance (without additional mods to take advantage of the higher octane) and is just giving your money away.