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    100 Octane Fuel for tuned 996TT

    Guys,

    My mechanic and tuner suggested I use 100 octane fuel in my 996TT for two reasons:
    1. Extra performance gain,
    2. To "flush out" the system-I am in the northeast US, using the 93 octane since I bought the car last July.

    Any thoughts on the performance and "cleaning" issues? I'll have the car back on Thursday since I upgraded it, and the local Delta Sonic carwash sells 100 octane for about 4 bucks a gallon, so I could use it on my next re-fueling.

    Re: 100 Octane Fuel for tuned 996TT

    Al - You won't see any extra performance, unless you have a chip that gives more than stock boost. 93 Octane is plenty to utilize stock boost without the ECU negatively affecting the boost level or timing.

    As far as cleaning the system, I think you'd be better off with a designated cleaner like 44K or Techron. You might also have the fuel tank drained (Ethanol can leave some water in the tank, AFAIK).

    If you want to be sure, use a half tank of 93 and half 100 and see if it improves anything. Using too high an octane can actually hamper performance, as the fuel will resist burning too much for good combustion.

    High octane fuel is one that is less volatile (not higher), as many misunderstand. This is why you can run higher compression or boost without early detonation.

    What does your boost gauge read? What can it read, max, in its current state of tune?

    EDIT: I just re-read your signature and see that you have oveer 600hp. Yes, you might benefit from more octane! The race fuel here is 110 octane and is around $4/gallon too. Good luck!

    Re: 100 Octane Fuel for tuned 996TT

    On a stock TT here in Europe you benefit up to 100RON (approx. 95AKI) as the OEM software advances timing slightly taking advantage of the extra oactane rating but only up until 2 extra octane points. This has been tested before. In terms of fuel BP ultime 100 NEW formula (the old one was crap) has shown significant gains in terms of power I noticed and EVO magazine tested it has well. On an Mitsu Evo the gain was 14bhp if I'm not mistaken...

    Re: 100 Octane Fuel for tuned 996TT

    Grant,

    The car is tuned with a GIAC/EVO stage 4 chip good for 600 peak HP/600lb-ft peak torque with the appropriate mods. to the intake and exhaust per the package, EVO said 120 octane race fuel would not likely help over 100, but the GIAC program boosts the K24's to 1.2BAR over stock and they said there would be a difference with 100 over 93.

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    Turbo Al said:
    Grant,

    The car is tuned with a GIAC/EVO stage 4 chip good for 600 peak HP/600lb-ft peak torque with the appropriate mods. to the intake and exhaust per the package, EVO said 120 octane race fuel would not likely help over 100, but the GIAC program boosts the K24's to 1.2BAR over stock and they said there would be a difference with 100 over 93.


    Nice! Let us know if you can feel the difference!

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    Grant said:
    Quote:
    Turbo Al said:
    Grant,

    The car is tuned with a GIAC/EVO stage 4 chip good for 600 peak HP/600lb-ft peak torque with the appropriate mods. to the intake and exhaust per the package, EVO said 120 octane race fuel would not likely help over 100, but the GIAC program boosts the K24's to 1.2BAR over stock and they said there would be a difference with 100 over 93.


    Nice! Let us know if you can feel the difference!



    Yes,

    I pick up the car Thursday, but I put in a full tank of 93 octane before I brought it in for the mods. since I had them do a wheel realignment check with the tank full. Plus, it's winter here, so I need some warmer and clear weather. I'll try a GPS measurement with my G-Tech later and a review for the forum in due course.

    Re: 100 Octane Fuel for tuned 996TT

    I've tried the mix of 100 and 91 octane gas on my 997S. There is no noticeable performance increase and you'll pay an extra $25 to do it over the cost of 91 octane alone.

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    U Boat Commander said:
    I've tried the mix of 100 and 91 octane gas on my 997S. There is no noticeable performance increase and you'll pay an extra $25 to do it over the cost of 91 octane alone.



    In a normally aspirated engine, there won't be a difference, but with forced induction, on the contrary, the whole ballgame changes.

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    Turbo Al said:
    Guys,

    My mechanic and tuner suggested I use 100 octane fuel in my 996TT for two reasons:
    1. Extra performance gain,
    2. To "flush out" the system-I am in the northeast US, using the 93 octane since I bought the car last July.

    Any thoughts on the performance and "cleaning" issues? I'll have the car back on Thursday since I upgraded it, and the local Delta Sonic carwash sells 100 octane for about 4 bucks a gallon, so I could use it on my next re-fueling.



    Al,

    I never go below 98 oct with my stock turbo! You can clearly feel the difference IMO, even the sound of the car gets more agressive! in europe all kinds of tests by serious magazines have been done and it's clear that higher octane fuel has a big effect on performance particulrly on supercharged cars! a seat ibiza with 150 hp would do 0.4 secs less to 100kmh with 100 oct. so start mixing high octane right away to that crappy 93 oct you have in your tank and you'll clearly notice the difference after two or three tanks!!

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    turbolite said:
    Quote:
    Turbo Al said:
    Guys,

    My mechanic and tuner suggested I use 100 octane fuel in my 996TT for two reasons:
    1. Extra performance gain,
    2. To "flush out" the system-I am in the northeast US, using the 93 octane since I bought the car last July.

    Any thoughts on the performance and "cleaning" issues? I'll have the car back on Thursday since I upgraded it, and the local Delta Sonic carwash sells 100 octane for about 4 bucks a gallon, so I could use it on my next re-fueling.



    Al,

    I never go below 98 oct with my stock turbo! You can clearly feel the difference IMO, even the sound of the car gets more agressive! in europe all kinds of tests by serious magazines have been done and it's clear that higher octane fuel has a big effect on performance particulrly on supercharged cars! a seat ibiza with 150 hp would do 0.4 secs less to 100kmh with 100 oct. so start mixing high octane right away to that crappy 93 oct you have in your tank and you'll clearly notice the difference after two or three tanks!!



    I thought I would drive until that 93 stuff is nearly completely out of the tank-I filled it up just before the upgrade so they would realign the wheels on a full tank-then I'll add the 100, it sells for about $4.50 a gallon here. Now all I need is some good weather.

    Re: 100 Octane Fuel for tuned 996TT

    Just so you know, 98 octane in Europe is about the same as 92 or 93 octane in the US - different classifications of octane...

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    Grant said:
    Just so you know, 98 octane in Europe is about the same as 92 or 93 octane in the US - different classifications of octane...



    Indeed.

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    Grant said:
    Just so you know, 98 octane in Europe is about the same as 92 or 93 octane in the US - different classifications of octane...



    I think your 94-95 octane is about equal to 98 octane in Europe.

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    Crash said:
    Quote:
    Grant said:
    Just so you know, 98 octane in Europe is about the same as 92 or 93 octane in the US - different classifications of octane...



    I think your 94-95 octane is about equal to 98 octane in Europe.


    I don't think so, but maybe you're right. I thought Porsche recommends 98 octane in Europe which translates to our highest available, 93. Some states only offer 91 here...

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    Grant said:
    Quote:
    Crash said:
    Quote:
    Grant said:
    Just so you know, 98 octane in Europe is about the same as 92 or 93 octane in the US - different classifications of octane...



    I think your 94-95 octane is about equal to 98 octane in Europe.


    I don't think so, but maybe you're right. I thought Porsche recommends 98 octane in Europe which translates to our highest available, 93. Some states only offer 91 here...



    Yeah, that's what I said "I think". I've heard everything from 93-95, but nothing definite.

    Re: 100 Octane Fuel for tuned 996TT

    tuners seem to find a co-relation between 93 AKI (anti-knock index) with our 98 RON...

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    Crash said:
    Yeah, that's what I said "I think". I've heard everything from 93-95, but nothing definite.



    That's because the relationship between the two rating systems is not a difinitively fixed one.

    Fuel is rated in Europe according to the Research Octane Number (RON) and in the USA according to a "combined" or average Octane Number derived from the formula (RON + MON)/2, where the "MON" is the Motor Octane Number.
    RON and MON are two different methods of arriving at an octane number. I believe the RON is always higher than the MON for all conventional gasoline types, but the difference between the two figures varies depending on the blending of the fuel.
    So it is not possible to say that Euro Octane rating is a fixed amount higher than USA Octane rating.

    Re: 100 Octane Fuel for tuned 996TT

    Quote:
    fritz said:
    Quote:
    Crash said:
    Yeah, that's what I said "I think". I've heard everything from 93-95, but nothing definite.



    That's because the relationship between the two rating systems is not a difinitively fixed one.

    Fuel is rated in Europe according to the Research Octane Number (RON) and in the USA according to a "combined" or average Octane Number derived from the formula (RON + MON)/2, where the "MON" is the Motor Octane Number.
    RON and MON are two different methods of arriving at an octane number. I believe the RON is always higher than the MON for all conventional gasoline types, but the difference between the two figures varies depending on the blending of the fuel.
    So it is not possible to say that Euro Octane rating is a fixed amount higher than USA Octane rating.



    Yes, I've see the formula before, but have never been able to find a MON

     
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