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Old 03-11-2004, 08:49 AM   #1
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Ethanol plus boost?

My state is planning on adding ethanol to it's gasoline like many other states have (5% by July 1, 2005). Anyone know how this will affect a car running FI? It supposidly reduces knock/detonation, so does that mean it's similar to running high octane allowing me to run more boost without retarding the timing?

Also, if I adjust my car to run on my state's 5% ethanol, how will pump gas in other areas affect my car since some will have no ethanol and some have 10%?

I'm making this thread general without a specific application, but I'm planning on getting a Vortech aftercooled kit at about the same time that new law's suppose to take effect (when my car's paid off in May).


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Old 03-11-2004, 12:31 PM   #2
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When added to gasoline, ethanol increases the octane and also provides a source of oxygen that reduces pollutants when the fuel is burned.
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Old 03-11-2004, 12:58 PM   #3
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So does 93 octane at a gas station with 10% ethanol allow more boost than a gas station with 93 octane without ethanol? Or do fuel companies remove other chemicals from the fuel when adding ethanol to keep the octane rating the same?

Does adding ethanol to a fuel mixture do the same as an ethanol injection hooked directly to the intake like nitrous? or does it act differently?

or to re-word what I'm asking...If I have my car set up to run on 93 octane with "x" amount of boost and the fuel companies decide to add a 10% mix of ethanol to the gasoline, How does that effect me? Can I now run more/less boost, will I gain/lose power, or will everything stay the same?
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Old 03-11-2004, 02:15 PM   #4
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Well it would depend on how much the 10% adds to the octane rating...if it's only 1 point (94oct) then i would just leave your boost at the same setting and just know that you have a little more piece of mind.

Only way to be sure and be safe is to get it up on a dyno.

I would kill for 93oct...in Cali we only piss 91 octane.
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Old 03-11-2004, 02:23 PM   #5
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Ethanol is simply an additive that is added to increase the octane rating of the fuel. Regular fuels with a rating of 93 are identical to ethanol blended fuels with a rating of 93. At least up here in Canada Car Manufacturers have been pressuring our Gov't to require ethanol blending as an alternative to MMT (an additive which the US banned quite some time ago) which is still used in all non-ethanol blended fuel in Canada.

I have been using Ethanol blended fuel in my ride from the day I brought it home (the enviromentalist in me forces me too!) You may notice a slight decrease in fuel economy (between 1-3%) for high ethanol blends (over 5%) as ethanol provides less combustion energy. Up here in Canada about 15% of all fuel sold is ethanol blended.
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Old 03-11-2004, 02:47 PM   #6
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thanks ya'll

We have 93 octane at our Shell stations and possibly Mapco. Most other places only go up to 91 or 92.

We do have some places that sell "racing fuel"...I guess it's 108 octane? May be 104 though.
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Old 03-11-2004, 04:46 PM   #7
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Forgot to mention that the other benefit of Ethanol blended fuels is that you don't need gasline antifreeze in the winter... Of course that is a benefit to us in the great white north. Nothing worse then having your gasline freeze up.
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Old 03-12-2004, 06:43 PM   #8
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The higher the octane the higher the boost you can go with out detonation. It doesn't matter if the octane boost come from lead, alcohol, or whatever. Is does matter to the enviornment.
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Old 03-13-2004, 12:28 AM   #9
 
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In 1998 ford debut'd the Ford Mustang Super Stallion.

It ran on gas and ehtanol, here is info on it:

http://www.etconnect.com/gt/FWN/superstallion.htm
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