Type of gas for SSEi?
05-26-2009, 01:51 PM
#11
DINOSAURUS BOOSTUS
Expert Gearhead
The reasons behind using 91+ octane versus 87-89 is to keep from causing damage to the engine.
Predetonation is a killer to these engines, when you run low octane fuel you have the potential of predetonation because more octane makes the fuel harder to burn. This is probably ok as long as you don't go over say 1/3 throttle.
Your pcm will also learn the constant knock retardation occurring causing it to use the low octane table. This is an attempt to reduce the timing to stop predetonation. In reality it causes less power and possibly uses more fuel than if you used premium.
Predetonation is a killer to these engines, when you run low octane fuel you have the potential of predetonation because more octane makes the fuel harder to burn. This is probably ok as long as you don't go over say 1/3 throttle.
Your pcm will also learn the constant knock retardation occurring causing it to use the low octane table. This is an attempt to reduce the timing to stop predetonation. In reality it causes less power and possibly uses more fuel than if you used premium.
05-26-2009, 09:44 PM
#13
Senior Member
True Car Nut
Everything you couod ever want to know about octane rating is here Octane rating - Wikipedia, the free encyclopedia
06-08-2009, 10:44 AM
#15
Okie Hokie
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