Rudy61SRT8

In West Palm Beach there is a little pump off to the side for "RACE FUEL" . I'm not sure on the octane but pretty sure it's 100 or over ... what is the purpouse of "RACE FUEL" , it's cheap ... and can a Challenger run it ? I know the station is next to the track my friend says it burns pretty much by the minute but I want a definiate answer thanks!!!

RoswellGrey

There used to be a station here that sold "race fuel," which indeed was about 100 octane. A friend of mine once got about 5 gallons and put it in his '69 Chevelle SS 396. He got on it a few times with that fuel in it, and in all honesty, it didn't make a LOT of difference. Definitely not worth the price.

That said, I'd be leery about putting it in a modern car. You gotta keep in mind that the Chevelle was originally designed to burn leaded fuel, so it had virtually no antipollution devices. No telling what that stuff would do to a modern engine.

bobbyj1

I used to be able to buy 110 Race fuel and I would put it in my 67 GTO which definitely ran better with it. I dont think it would make a noticeable difference in a modern car.

trev

in big old engines higher octane isn't usually helpful, as the only time I could see where the higher octane would help is in very high compression situations.

like say a turbo charged car. you want to have the higher octane so you can build up more compression before the gas ignites.

its actually less explosive gas.

or needs a higher temperature before it ignites.

Rudy61SRT8

thanks trev.

05flhtcse

Back in the late sixties, high performance engines from the factory came with a C/R 10 to 11.5. We only had distributors to regulate the spark and advance. Higher octane fuels helped us get by these limitations. To get the best et's, we would run the timing as close to detonation as possible. Modern engines with computerized ignitions will do whatever it takes to eliminate detonation. A much better set-up. Our cars are shipped from the factory to satisfy a majority of buyers. That's why the aftermarket has many computer options for the performance minded. If you run the suggested fuel with an unmodified engine then you should never have a problem. In fact higher octane could cause you to lose performance as the burn would be incomplete.

raj1980

If your car needs 91 Octane, then that's what it needs. You will benifit nothing from putting 100 Octane in a car the only needs 91.

Some high compression engines may require such high Octane... especially older engines that did not have knock sensors to retard the spark advance if the car starts to predetonate. But if your car doesn't need it, your wasting your money by buying it. Premuim fuel doesn't give you better mileage, power, or clean you engine better, unless your car needs it.

10secDodge

I run 110 octane racing fuel in my 13 to 1 compression race car. It is required to keep the high compression motor out of detonation. In a regular motor as in the cahllengers, you will likely see a performance decrease. You won't hurt anything, just spend more on fuel to go slower.

lear4406

You guys answered that question in full. I concur. Compression and cam timing thats what it is. with no moden electronics, you needed to have higher octane to be safe on the higher compression. You guys said it all.

Rudy61SRT8

Is there a difference between 91 and 93?