Quote:
Originally Posted by 88*mr2
run 91 dont use a low grade thats the worst for ANY car because it burns badly and it just gums up and will leave resen faster than a high octane fuel like 91...i own a 88 2 and i run 91 fuel through it.
if u boost it up and are running i would say 12+ psi run 91 or if u can find it 92 it will help elimintate ticking in the motor and help it run smoother and cleaner because there is less crap in the fuel...run 91 it will be help your motor last longer and run smoother and its honestly worth the extra $ per gallon
and the fuel but 92 or 93 can be found at lets say rare type gas stations like BP gas stations if u have them in your area
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This is actually somewhat incorrect information.
Gas ratings aren't by what's in them and/or what will gum up your engine -- the octane rating refers to the burn pattern of the flamefront and how easy it is to burn.
Higher octane gas is more difficult to ignite. The higher the heat in the engine (usually found in higher compression and forced induction applications) the higher octane you want so that you don't cause pinging, aka preignition.
You want to run the LOWEST octane gas possible without pinging under load. Reason for this is that if you're, say, running a bigport and using high octane gas -- then actually you won't burn all of the gas off (more difficult to ignite and there is less heat in the combustion chamber) causing carbon deposits on exhaust valves, 02 sensors, and in your cat.... with time the buildup will cause other problems.
So to the OP: the s/c's have a gas switch. I would play with gas ratings a bit and if you hear pinging with the gas that's in your tank, finish the tank with the switch set to regular gas, and move up in octane until you don't get pinging anymore.