ethanol
11-21-2003, 07:40 PM
#2
Rennlist Member
Well, it definitely doesn't help. It won't hurt the car but avoid it if possible. In Denver, all pumps are 10% ethanol from Oct - Aprril to lower carbon monoxide emissions.
Last edited by CanyonBlaster; 11-21-2003 at 08:03 PM.
11-21-2003, 07:43 PM
#3
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Ethanol is alcohol - the drinkable kind. Methanol: the make you blind kind.
Since the octane rating is determined after the ethanol is added, its not as helpful as if you added 10% to your current fuel.
Sean
Since the octane rating is determined after the ethanol is added, its not as helpful as if you added 10% to your current fuel.
Sean
11-21-2003, 08:06 PM
#5
Rennlist Member
Sean, no real scientifc reason. Mostly cuz the Audi Tuner I work with said turbo cars don't run as well on that "grained out petroleum" ! LOL!
If he's wrong I would prefer to know.
thanks
is that your 914?
If he's wrong I would prefer to know.
thanks
is that your 914?
11-22-2003, 01:56 PM
#6
Rennlist Member
Ethanol has a slightly higher specific energy than gasoline especially at richer mixtures. So if you have a way to enrichen the mixture at full throttle(maybe adjust your fuel pressure a little higher) you will make a little more power. If you leave everything the way it is you will have the same power or a tiny bit less. At part throttle you will basically have the same power because the O2 sensor/DME combo will automatically adjust for the richer stoichiometric mixtures.
Octane rating is whatever it says on the pumps.
All in all, it's a better fuel but we are only talking about 10% here so the effects either way are minimal.
Octane rating is whatever it says on the pumps.
All in all, it's a better fuel but we are only talking about 10% here so the effects either way are minimal.
11-22-2003, 02:54 PM
#7
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Alcohol has a higher enthalpy of vaporization then gas. Therefore, alcohol can remove more heat from the combustion chamber. The problem is, Octane rating is a measure based on the temperature at which the gas ignites. So, who knows if its better, since the octane rating is compensating for the temperature delta.
Theoretically, you need to run 33% more alcohol then dyno fuel to maintain stoichometrical ideals. So, yeah, its probably not a bad idea to richen it up a bit if you can.
Yeah, that's my old 914. That pic is from Laguna.. I turned 1:45s at laguna and 1:35s at Willow(the old track) back in the late 90s with that car.
Sean
Theoretically, you need to run 33% more alcohol then dyno fuel to maintain stoichometrical ideals. So, yeah, its probably not a bad idea to richen it up a bit if you can.
Yeah, that's my old 914. That pic is from Laguna.. I turned 1:45s at laguna and 1:35s at Willow(the old track) back in the late 90s with that car.
Sean