Quote:
Originally Posted by 2004f1505.4x4
I'm looking at an edge and I run 90 octane. Could I run a 91 octance and be safe?
|
It depends on a couple of things.
First, is your gas graded by the (R + M)/2 method? If so, the answer is "yes", but you might want to retard your timing by -0.5 degrees. However, what's your altitude up there? IF you are somewhat above 3500 feet (or a bit more than 1000 meters), you can probably leave the timing alone. Gas octane is reduced for fuel sold at higher altitudes because the altitude improves the anti-knock properties (while robbing you of power).
But, if your gas is graded using the RON (Research Octane Number) method only, DO NOT use a 91 octane tune. You are filling with gas that is only slightly higher in octane than our 87 octane. Use an 87 octane tune.
- Jack