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    Finding 93 Octane Gasoline...

    Drove 2700 miles out West this week..North Dakota, Montana, Wyoming, South Dakota and never found any 92 octane gas let alone 93. Glad we were in the Merc which only requires 91. What would you do if you lived there with your 997TT? Please advise. Thankyou.

    Re: Finding 93 Octane Gasoline...

    I've never seen 93 octane gas around here. I've seen 94 octane gas up in BC though. Maybe head North cross the border to get some?

    Re: Finding 93 Octane Gasoline...

    Porsches run fine on 91 - the only available in CA.

    Re: Finding 93 Octane Gasoline...

    living in the relative backwater of nm. thought i may be one of the few who could only get 91 oct, although i wasn't worrying to much as the tt runs fine on 91

    Re: Finding 93 Octane Gasoline...

    Yes, the tt will run on 91 but 93 is reccomended. Manual says it will adjust to 92. Loss of performance with less than 93 but probably imperceptible unless measured.

    Re: Finding 93 Octane Gasoline...

    Quote:
    atomic80 said:
    I've never seen 93 octane gas around here. I've seen 94 octane gas up in BC though. Maybe head North cross the border to get some?



    True, I fill up on 94 octane regularly

    Re: Finding 93 Octane Gasoline...

    93 Octane is standard "Premium" in Texas.....

    Re: Finding 93 Octane Gasoline...

    There are Gas Stations in Las Vegas that offer 100 octane racing fuel that they claim is specially formulated for high compression supercharged and turbocharged engines with compression ratios up to 14:1. Is there any problem with running this fuel in the 997TT? Click Here to read the specifications.

    Re: Finding 93 Octane Gasoline...

    I believe that the rated horsepower for the TT is with 93 octane gas. Here in California, I mix approximiately one part 100 octane unleaded racing fuel with two parts 91 octane to create about 93 octane. I do not believe that using gas with an octane rating greater than 93 would improve performance unless you have the ECU reprogrammed.

    Re: Finding 93 Octane Gasoline...

    That is good advice, but if 100 octane will not really make a difference, I will see if I can just find 93 octane fuel. If not, I think I will try the mixing fuels approach as well. What are you paying for 100 octane racing fuel?

    Re: Finding 93 Octane Gasoline...

    $6.99/gallon.

    Re: Finding 93 Octane Gasoline...

    OUCH! And you can really feel a difference in performance?

    Re: Finding 93 Octane Gasoline...

    Racing gas is expensive and can be hard to find. Fortunately, my local 76 station has racing gas and it is very conveniently located. Given the fact that I blend 100 and 91 octane, the extra cost per fill-up is about $17 with 100 octane. I'm on the waiting list for the TT so I can't speak to the effect of using 91 vs. 93 octane for it. However, my 996C2 seems to have better throttle response and more power at high rpm with 93 octane compared to 91. Since we buy these cars for their performance, my thinking is that I do not want to cause the engine computer to detune the engine under certain situations by using lower than recommended octane. It would be interesting to know exactly how much power is lost by using 91 octane.

     
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