FWIW, there are several stations locally (NOLA area) that offer no-ethanol gasoline. In my JCWS Cooper (1.6L turbocharged engine), I average about 31 MPG with the ethanol blended stuff and about 2 MPG better with the no-ethanol stuff, with approx 70/30 City/Highway driving mix.
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Originally Posted by GrantG
(Post 10974229)
Fair enough. So we're talking about 15 to 20 hp on the GT3. Porsche would charge $20k for that sort of bump ;)
I just wish I had a car in my garage right now where any of this would make a real difference. :crying: |
Originally Posted by Mike in CA
(Post 10974327)
I just wish I had a car in my garage right now where any of this would make a real difference. :crying:
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Originally Posted by fbirch
(Post 10974273)
FWIW, there are several stations locally (NOLA area) that offer no-ethanol gasoline. In my JCWS Cooper (1.6L turbocharged engine), I average about 31 MPG with the ethanol blended stuff and about 2 MPG better with the no-ethanol stuff, with approx 70/30 City/Highway driving mix.
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I'm convinced. Just bought four VP fuel jugs and hoses.
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There is a Exxon in my Tahoe neighborhood that sells it for street use. The owner stated that stations located above a certain altitude, 6500' IIRC, are allowed to sell ethanol free gas if they choose. Again, that's what the guy behind the counter stated ...and he's been selling it for years now.
It is .75 cents a gallon more expensive then premium SHELL gas though, and since I'm running a boosted V8 with power to spare at altitude I pass on it. Summary, apparently it's legal to sell ethanol free above a certain altitude. |
Originally Posted by donuts
(Post 10974261)
Don't forget about the fact that ethanol damages catalytic converters.
You are either confusing it with leaded fuel, or methanol, or hair spray. |
In Modern cars, if the injectors are sized appropriately, (read, not too small and at 90% already in duty cycle), then the increased ethanol in gas past the 10% would only improve the knock resistance of the fuel. Since most cars are coming out with 11:1 compression, the knock sensors are on alert at all times, and you would gain some horses that would come from no ecu retard because of the crap 91.
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Originally Posted by GrantG
(Post 10974109)
So, you would lose 3.4% of your hp, but that assumes perfect air/fuel mixture. However, ethanol needs to burn much richer than gas, and the ECU is not going to burn the mix perfectly since it assumes gasoline, so the loss is more than 3.4%...
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Originally Posted by BC
(Post 10985357)
I hadn't heard this one before. Did it also steal your dog's food? Your statement is incorrect. It makes no difference to your converter.
You are either confusing it with leaded fuel, or methanol, or hair spray. I don't have a dog. My statement was the result of my own experiences as well as a Google search of: ethanol, catalytic and converter. It seems like popular opinion is that it damages your converter. I wasn't confusing it with leaded fuel, or methanol, or hair spray.. Thanks |
Well this is a great thread about Ethanol and I just want to throw in my .02 cents. In addition to our 2004 Carrera C4S, we have a 04 Land Rover Discovery and a late model Infiniti G35. The G35 seems to not care if I run the non ethanol stuff through it or not, but with the Porsche and the Land Rover these two do not like vegetables in their gas. The Rover has the most problem with the stuff, especially at idle you can tell. When I run the non ethanol fuel in the Porsche it idles fine, seems to have more power and I get better fuel milage. Just my .02, Cheers
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BC is definitely on the right track. I will add some more information.
I did a quick search to see why people are under the conclusion that ethanol damages catalysts. The single thing I see is "ethanol burns hotter than gasoline". Absolutely incorrect. Ethanol burns cooler than gasoline, hence the lower energy rating. Its likely the 991 is designed to run on 93 octane, and its quite likely the ECU will slightly retard timing when switching 91 octane. This means there is zero performance or mileage benefit from switching to 91. 98 octane would absolutely not be best for the 991 GT3. The car was designed from the factory to run optimally on 93 octane. To take advantage of 98 octane the engine would need forced induction, higher static compression, or very advanced timing. Adding 98 octane does absolutely nothing, and in most cases would have negative effects because most (not all) higher octane fuels have slower burn rates than lower octane fuel. High octane adding power to a normal street car is a myth. |
Originally Posted by ScorpionT
(Post 10987560)
98 octane would absolutely not be best for the 991 GT3. The car was designed from the factory to run optimally on 93 octane. To take advantage of 98 octane the engine would need forced induction, higher static compression, or very advanced timing..... High octane adding power to a normal street car is a myth.
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High octane adds a bit of insurance against your the car's ECU/DME from pulling timing during hard track sessions at high ambient temps. Today's anti knock systems are incredible and timing is generally pulled before any actual pre-ignition events. That said, I'm sure that at some octane level it's a point of diminishing returns.
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Originally Posted by BC
(Post 10985410)
In what car? Where is the ECU assuming? The oxygen sensor is doing its job - usually - so it will know that the stoich is slightly different.
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