Atrox

Only one station with 93 octane and its out, can I get by with 91 for the time being?

rmc1148

91 will work fine

"02996ttx50

sadly, i've been using it for years, as that's all we get.

Kevinmacd

Think 91 is the recommended minimum!

geetee

unless you're tuned....then i'd stay out of boost

race911

Better be, for those of us on the West Coast. (Ignoring fuel available at altitude.)

RangerDick

Like 02996ttx50 says, In commie California, 91 is all we have available. I run it and never had a problem. I have a 1 bar tune and never heard it detonate. Saw 1.1 bar and 135 mph yesterday on 91 octane with no bad noises.

dprantl

Ok, but every tune is different. Just because one guy with a tune has no problems with 91 octane, doesn't mean someone else with a tune from someone else (or even an older/newer tune from the same tuner) won't have serious issues. If you can't ask the person who tuned your car whether or not it is okay to run under boost on 91 octane, just don't do it to be safe.

Dan

Kevinmacd

Lot of times they ask you what tune you want for what octane during the ordering process.

cdk4219

By the time you hear the "chain rattle" of detonation, it is pretty severe. Most detonation isn't audible, especially in the rear.

techweenie

There are stations all over CA with 105 octane pump gas.

Nearest to my travels is the one at Sherman Oaks and Woodley.

I think most major metropolitan areas have higher octane gas available if you do a little research.

But I've been running 91 with no issues.

EDIT: found this:

http://www.6speedonline.com/forums/9...locations.html

Tiesto996tt

Thanks for finding us a link that is 8 years old and $7.65 per gallon for high octane. I have been running 91 octane with no issues.

Macster

91 octane is ok... well, frankly it sucks, but it is "ok" in that for years now both of my cars have used it almost exclusively -- ignoring the infrequent times on a road trip when higher octane gasoline is available -- without any issues.

I have to get up on the soapbox a spell and note how CA which prides itself as a forerunner in being "green" allows gas refineries to sell only 91 octane instead of higher grades of octane, like 93 for instance.

With 91 while the engine runs "ok" our Porsche engines (and this is true of most other engines that from the factory requring premium gasoline) run better with 93.

Now "better" is a relative term. Better in that timing is advanced so the fuel starts burning sooner and as a result more chemical energy is converted into mechanical energy. Thus mileage improves and less fuel is burned. This is *green". Green in that the cars get better gas mileage, burn less gasoline. This means less pollution directly and indirectly as it is polluting to have to deliver the gasoline to the stations and polluting to have to produce more gasoline that less efficient engines burn running a sub-optimum grade of octane. And less gasoline has to be refined and you ought to hear the howls of protest against the refineries for "poisioning" the locals. If CA really cared about these people then it would require higher octane gasoline be produced to reduce the refinery emissions.

It is the above that every time I hear/read of CA proposing or just mandating another rule or regulation or law for the sake of the environment, to combat "man made global warming" or "climate change" and what have you, I seriously question the benefits.

Even if a gas station selling 100+ unleaded gasoline was next door I'd not use it. Cost is one reason. And frankly I noticed no difference when I filled up my nearly empty Boxster's gas tank with 6 or 7 gallons of 100+ octane gasoline.

However, if I were to track my cars I'd definitely use race gas and as pure as I could reasonably arrange it. That is I would not try to blend (pardon the expression) regular premium gasoline and racing gasoline to arrive at 93 or 94 octane but I'd fill up a low fuel tank with as much racing gasoline as possible.

Gasoline tests have found that racing gasoline, undiluted with "regular" premium gasoline, delivers considerable performance benefits when used under track conditions. So not only does one buy some insurance against detonation he gains some performance from using racing gasoline.

Oh, none of my cars have a "tune". If one has a "tune" then he has to follow the octane recommendations that should have come with the "tune". If this calls for blending the usual premium gasoline with some amount of racing gasoline, then so be it.

techweenie

I figure it's better to light an (old) candle than to sit around cursing the darkness. The station I first mentioned (and is on the list) was still selling 105 octane 4 days ago...

Th Dude

Agreed.