996 Turbo / GT2Turbo discussion on previous model 2000-2004 Porsche 911 Twin Turbo and 911 GT2. Sponsored By Vivid Racing
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I have access now to 100 octane at the pump w/out having to drive to Sears Point....
What about running 110 octane...other than the cats going bad, any drawbacks...(obviously since I am thinking about this , I would only be driving in MEXICO with 110 octane and the EVOMS GT700 race file ..)
Do CEL lights come on, does it cause PSM/ABS issues ...?
For those of you in the Bay Area, you can get Racing Fuel at the Sunol Gas Station off Andrade exit on I-680 (100 octane and 110 octane at multiple pumps). Attendant said he had 114 octane too.....(have to verify that)
P.S> Watch out for the CHP on this exit though......
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2001 TT GT700
1999 Ferrari 355 Spider F1
2008 Cayenne S
your 02 sensors will go bad.. and those are expensive....
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01 996TT - 9.91 sec.145.64 mph 1/4 mile (4.62 sec. 60 to 130mph) 06 CLS AMG
Assuming the 110 is leaded, which it likely is as the highest octane unleaded I've ever seen was 106 or so, you'll kill your cats (if you have 'em) and your 02 sensors.
While it's not the end of the world if your 02 goes bad, so long as it happens quickly (ECU will just default to pig rich limp mode), the danger is in a progressive failure due to the lead deposits. If it gives inaccurate readings to the rich side, the computer can pull enough fuel to lean you out and hole a piston or two.
I'd say it's okay to run leaded briefly, providing you change out your 02 sensors afterwards, or at least clean them with a torch.
That said, you'd need to be running an ungodly amount of boost and/or timing to need more than 100 octane.
From my understanding, all race fuel pretty much comes from the same manufacturer...it just has different labels. That being said, I was told that anything over 100 octane will cause long term damage (not exactly sure what that means). This includes even the unleaded sunoco 104 octane. Sunoco does not recommend this for street use.
Now....one question on this topic , does 100 octane cause mafs to go bad? Assuming you use that with a 91octane GIAC program? I read somewhere that this may be the case.
well what about putting in 10 gal of 104 octane(unleaded) with 10 gal of 91 octane(the highest i can get here)? Am i still causing long term damage even though it's somewhat diluted out?
well what about putting in 10 gal of 104 octane(unleaded) with 10 gal of 91 octane(the highest i can get here)? Am i still causing long term damage even though it's somewhat diluted out?
Well, I spoke to the midwest distributors of the Sunoco race gas. He informed me that anything over the 100 octane mark has not been thoughrly tested and can lead to some long term damage (he mentioned something about seals/gaskets). I am not entirely sure about this, so maybe someone on the board who knows more can chime in on the validity of this. Lizard1, are you running stock program?
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Originally Posted by Lizard1
well what about putting in 10 gal of 104 octane(unleaded) with 10 gal of 91 octane(the highest i can get here)? Am i still causing long term damage even though it's somewhat diluted out?
Well, I spoke to the midwest distributors of the Sunoco race gas. He informed me that anything over the 100 octane mark has not been thoughrly tested and can lead to some long term damage (he mentioned something about seals/gaskets)
That's complete nonsense. Unless there's a corrosive alcohol in the fuel, it's not going to do jack to fuel lines and injector seals and such.
That said, there's no real benefit to running higher octane fuel than you need to support a given level of boost/timing and keep out of detonation, but you certainly won't damage anything simply by running a more stable (higher octane) fuel.
it just has different labels. That being said, I was told that anything over 100 octane will cause long term damage (not exactly sure what that means). This includes even the unleaded sunoco 104 octane. Sunoco does not recommend this for street use.
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Thats crazy... I run anything from 93 to C16 in my evo... and its tuned for it...
My current project the 996tt is the same... 93 pump and I go all the way up to C16.
guys like Craig and VRalexander run only on race leaded gas... the higher the octane the colder it stays in the combustion chamber... less detonation etc....
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01 996TT - 9.91 sec.145.64 mph 1/4 mile (4.62 sec. 60 to 130mph) 06 CLS AMG
I never run anything less than 101 and often run 109 (both unleaded) my car is tuned for it and runs like a bat out of hell, no damage at all. I fear the damage that detonation from low octane pump gas can do to these high boost machines.
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Thats crazy... I run anything from 93 to C16 in my evo... and its tuned for it...
My current project the 996tt is the same... 93 pump and I go all the way up to C16.
guys like Craig and VRalexander run only on race leaded gas... the higher the octane the colder it stays in the combustion chamber... less detonation etc....
Sounds good to me! I really did'nt understand it myself, however him being the main distributor had me worried a bit. Thanks for the feedback!
All I have found at a local pump in my area is Sunoco 260 which is R+M/2 98 octane according to the manufacturer. Who makes the 100 octane unleaded?
Simba,
you are absolutely correct in your statement about "no real benefit to running higher octane fuel than you need".... I believe there is actually a slight disadvantage to running a higher number than you need other than the problems with the tetra ethyl lead factor. When you volumetrically compare equal amounts of low octane and high octane, I think there is less heat of combustion, hence less horsepower being generated with all other factors being equal in the comparison.
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