ds2k1

I live in SF and am wondering if anyone knows where to get 93 octane gas either in the city, or along the Peninsula? If so, does 93 octane gas provide much of an improvement over 91 octane gas?

Thanks.

Dave07997S

Good luck...your best bet would be to blend a couple of gallons of 105 F&L unleaded race gas. A little more than 2.5 gallons per every 16 galllons will get you slightly above 93 octane. I run 4 gallons of 105 in my M3 to get me close to 94 octane as the software I run in the car currently requires 93. I live in LA, so I get the same crappy 91 you do..


Dave

4thporsche

You could probably do a google search and find something local to you that has 100 to 105 octane. I found a thread here with stations but all that was listed in Northern California was Sears Point.

As far as performance... I'm hooked. Last 3 tanks I put in 4 gallons of 100 octane each time. I do notice a difference. There are 3 stations that are fairly close to my home that have the 'juice' so for me it's a no brainer.

FYI... I live in LA, the 91 octane sucks.

andre5

VP Racing Fuel
1495 Hays Street
San Leandro, CA 94577
510-483-4318

93 and 100 Octane for sale.

I don't know what the price per gallon is.

kgorman

You can always go up to Infineon Raceway and fill up there

Dr. No

They have 100 Octane at the 76 on Woodside Road in Redwood City. Mix about 65/35 with 91. That's the only place I know; though you think with the population of Porsches and Ferraris in Silicon Valley there would be a couple more.

diverdan

Short of tracking the car, I am wondering if there is any noticable difference.

The only way I could think of checking would be using a diagnostic tool to see if the car is pulling timing to stop knocking. If it isn't, then there shouldn't be any benefit to trying to mix up to a higher octane. As I understand it, the only benefit to higher octane is resistance to detonation.

If I remember correctly the 91 octane fuel sold here (West Coast) is a result of some sort of anti pollution formulation, hence the 2-3 point octane reduction from other parts of the country. It seems improbable to me that Porsche would actively sell a car in a market where there wasn't appropriate fuel (sort of like deliberately selling a car with catalytic converters in a country that still uses leaded fuel). The liability issue is pretty obvious.

So, either Porsche decided the octane difference wasn't significant, there is some adjustment made to cars sold in this market, or they are totally ignoring the issue. Personally, I have a hard time believing the last one since CA alone is a bigger market than most countries.

If I am in error, I would appreciate an in-depth explanation.

Dr. No

There is no benefit going north of 93 octane unless you have a chip that will use the higher octane fuel.

However, I notice a difference between CA 91 and the 93+ cocktail, and I know people with chipped cars who swear by it.

johnbtrask

I've got a 92 C2 with a factory Cup chip. Predetonation can be induced by a several factors, primarily air temperature, engine temperature, altitude, and to some degree humidity. Any time the engine management computer detects detination it begins to back the ignition advance off, the result is reduced hp. Subjective evaluation of engine performance is just that, the only way to know for sure if the engine is performing at 100% is on a dyno, or with a stop watch over a known distance. (Why didn't Porsche put a second hand on the clock?) I live in Southern California, and see a reduction in performance in the summer when the ambient air temp is 90 to 100. There is a 76 station in Agoura Hills that sells 105 octane, ($5.00+per gallon last time I checked, maybe more now.) When I run this straight or a mix I do notice an improvement during these high temp periods. I would say its your call. If your're running at an event where you want the car at peak performance use it. Other wise just go with the flow, and have some free fun on cool humid days, which you probably have more of in the Bay Area than we do down here.

PAULSPEED

Hi,
There is racing gas in South San Francisco. I do not
remember the name of the station but it is on south linden avenue
close to victory ave. The gas is like 102 octane. It has a
purple tint. You could pour some in with your 91 octane gas. Be
careful because this gas will disolve ruber. Running this gas
will make the engine run cleaner.
Paul