Hey guys...I was on my way home from NJ yesterday and stopped to fill my tank. I noticed that the gas station sold Street Legal 100 Octane race fuel...I thought about getting some just for kicks to see the difference but it was double the cost of the 93 high test!

Has anyone here ever run there car on 100 octane? What is the difference? Does the g run faster or pull harder? Are there any noticeable increases in power or mileage? I am curious and kinda want to fill my tank with the 100 octane at least once...

- Jay

 

Im pretty sure.. your gas mileage would be -3 mpg

 

Ive mixed about 50/50 for $hits and giggles. No power or milage difference that i could sense. My AC seemed significantly colder though. Weird. Why would you loose gas milage?

 

If you had a higher compression car that needed the higher octane to prevent knocks/pings, this would help. Usually FI cars would be likely markets for such fuel. I don't expect power gains from higher octane fuel. If anyone else knows better, I stand corrected.

 

Much above 91 octane won't make much diff unless you have bumped timing.

C.

 

Well it would resolve all the pining issues we w/ the 6mt have...

 

Pinging? I've never had pinging problems with my 6mt. But I do get a lot of clutch clatter. I guess you could mistake that for pinging if the windows are up.

 

You don't need it unless you're boosted.

Higher octane does not equate to more power. Octane ratings are basically, the fuels ability to resist preignition (pinging). Therefore a higher octane gasoline is kind of actually, harder to burn than a lower octane. This is most beneficial in FI cars with higher intake temps. Higher intake temps are more vulnerable to preignition.

 

Right on the money. Good stuff.

It's funny how people think ALL cars will have more power w/ higher octane....

 

I don't know much about the science of gas and octane. Since they say lower octane is not good for our G engines (87-89) - I was always under the impression higher octanes burned more efficiently and thus provided better power.

Now I know not to bother with anything above 92.

 

Were you close to Englishtown in Old Brick Township?

 

Actually it's not entirely true.

You will make more power on certain types of high octane gas because they burn hotter than pump 91 / 93.

If i remember correctly. VP's Leaded 112 burns the hottest.
but in any case it'd be about 5 -10 hp difference. not enough to warrant the difference in cost.

And higher octane gas is not harder to burn. Higher CR's associated with high octane gas are actually harder to ignite. And this is not to be confused with "spark blowout" which is common in forced induction cars.

 

do all 6mt's chatter....my buddy who's a mechanic said it was the throwout bearing because when you press the clutch it goes away but infiniti said that everything was fine....i hate the dealer they're major jerkoffs!!

 

tried it, full tank on accident.... didnt feel jack chit.

 

Within reason octane listed on the pumps is a marketing tool the numbers do not have to be accurate. Refiners sell regular and premium and report to the pipeline carrier the rough batch test quality [octane].

ODB2 engines can adjust for changes via knock sensor......they can advance a small amount from standard for better than normal and retard a GREAT AMOUNT for lower octane.

You must be careful in that ethanolized gasoline while having a high listed pump octane will be lower in power creating ability due to lower BTU [heat generating] values -------3-5% on a good day.

Horsepower and torque will be reduced on ethanolized fuel.

100 octane is usually vey high in aromatic and very high in BTU so it might produce 2-4% MORE than conventional and 5-9% more than ethanolized gasoline..............depends on how ecu reacts to differences.