Octane Differences
Thread Starter
Staging Lane
Joined: Mar 2005
Posts: 67
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From: Katy & College Station
Octane Differences Howdy! Just curious as to how big of a difference and what kind of differences some of yall have experienced with different octane and which rating yall recommend and what brand and why. Thanks a lot! I know on dynos on truck chassis vehicles, octane differences didn't change much on the power rating, but i know when i put a different octane into our HD, i can feel a huge difference, same thing with my sisters crappy *** 02 mustang GT. No LS1 yet in the family, but thats why im asking cause im considering one. Also what kinda MPG difference do you get between the octane ratings?
Well, recently I barrowed a friends scanner to mess with timing (just got a timing tuner). And found out that on stock timing under WOT I was seeing 4-10* of knock retard(computer is retarding the timing 4-10* = BAD). I have new plugs/wires and they are gapped correctly. So I found a station that has 100 octain and mixed it about 50/50 with 91 octain(what I ALWAYS run) and ran the car again. On the new run with the 50/50 solution I now have 0* of KR(knock retard) 
. I was also able to add an additional 3* of timing(2*base, 1*WOT) with 0* of KR. Apearently my engine on stock timing was pinging and I was unable to tell, I didn't hear any abnormal noises due to the computer retarding the timing and my loud exhaust. So by runing a higher octain I'm able to run not just 3* but a total of 6-12* of timing because its not retarding the timing under full throttle. Hope this helps some. Oh and I usually run 91 from chevron(might be the problem with the 91 gas, dunno).
-William
. I was also able to add an additional 3* of timing(2*base, 1*WOT) with 0* of KR. Apearently my engine on stock timing was pinging and I was unable to tell, I didn't hear any abnormal noises due to the computer retarding the timing and my loud exhaust. So by runing a higher octain I'm able to run not just 3* but a total of 6-12* of timing because its not retarding the timing under full throttle. Hope this helps some. Oh and I usually run 91 from chevron(might be the problem with the 91 gas, dunno).-William
