i couldn't believe it! a regular sunoco gas station in a small town next to me (auburndale, fl) has two pumps with 100 octane "racing fuel". it was $6.79 a gallon, which i think is quite a bit cheaper than the price at sebring race track; which until now was the only place i've seem such high octane fuel. anyone else see this at their local sunoco?

how much of a diff is it between 90-93 and 100?

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i've never tried anything besides 93. but now that it is so close to home i can't wait to try it and see if i can tell a difference.

their is a a sun station in LIC NY that sells 100 and 104 octane. It is the only place I have ever seen it in this area.

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Craignyc
Cayman S 2006 - Sold
Boxster 2001 - race car and current track toy.
www.nycs4.com/cayman_track_times.html

Check out VP Racing Fuels: VP Racing Fuels They may have a distribution center near you. And they may have a service station just around the corner that can supply 5 Gal cans and larger of 100 Octane Unleaded.

No affiliation here. I just learned about them and got some fuel for my American Iron.

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Cayman S - a portable amusement park

- 2006 Cayman S
- 2003 Dakota SXT
- 1963 Studebaker Avanti, R2, 4-Speed
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LL

Just remember that the engine management system in your car is optimized for 93 octane, so if you're already getting 93 octane at the pump, then you're getting all you can out of the car octane-wise. Any more and you're wasting your money. For those of us out here in the West, where 91 octane is what's mostly available... when we're able to find 100 octane, we mix a couple of gallons of it with the rest of the tank at 91 octane to get the full 93 that the car can take advantage of.

brad

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21-year PCA Member
PCA DE Instructor

Try a 50/50 mix first. Your stock ECU can't take advantage of all of the extra octane. My brother's Turbo has a switch that takes him from 610 to 690 when on 100 octane. That is a 13 percent increase in HP. An S might pump out 340 HP on 100 octance IF YOU HAVE AN ECU tool too make the switch. You would also overheat your cats and throw a CEL. Then your car would blow up on 93 octane. :-)

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2007 Speed Yellow Cayman GT 2.7 (retired)
2008 Guards Red Cayman GT 3.4
"Carpe Cayman"

That's expensive!

$6.79 a gallon.



When I went flying with my friend we gassed up his little kit plane that has a modified VW 4 cylinder engine and I saw an AVGas pump rating of 100 Octane.

Moreover, it was a lot cheaper than $6 a gallon. As I recall it was about $3.99 in June when I was paying $2.86-$3.47 for regular unleaded 85~87 Octane.

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Don't miss scraping my master's windshield, winter oil, winter tires, chains, pluggin' in the car over night--block water heater! and interior warmer. And having to put anti-freeze in my GAS!

Do miss slippin' & slidin'.

It would be foolish to run 110 "leaded" race fuel in your Cayman without major ECU and compression changes. The key word there is "leaded" not unleaded. Any spark would ignite that fuel and it will fire much hotter than the 93 octane. Therefore, ECU use it or not the chamber will become hotter than designed and no telling what terrible things might happen.

Anyway, we can buy 100 or 110 octane at Speedway/Sunoco here in Sarasota. However, state law does not allow you to pump this gas directly into your car. It can only be pumped into fuel containers.



GuyC

When I went to school in Daytona one of the stations across the street from the track sold 100+ octane race gas and even back then it was somewhere around $5 per gallon. I always wondered how many people bought race gas right after a race.

Is any of this correct, other than that 110 octane gains nothing in an OEM stock Cayman? I'm not a chemist, but gtscayman should be able to set this straight. My own understanding is that the octane rating is a measure of the fuel's resistance to detonation, i.e. dieseling. And since we're talking about octane rating, not the actual concentration of the chemical known as "octane", I don't see that combustion temperature and velocity are at all well-specified by the octane rating.