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JBurer JBurer is offline
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Join Date: Nov 2008
Location: Austin, TX
Posts: 205
New gasoline/ethanol blend

EPA says E15 is ready for prime time... and your new-ish car — Autoblog

Interested in hearing opinions related to the new E15 gasoline blend becoming available. Reading that it's approved only for 2007 and newer vehicles makes me wonder what the tuning implications will be for modified cars designed to run on current premium fuels.

This won't impact most of us - but for that guy who was just barely getting away with running his 930 lean on existing fuels (or a modified car tuned on the ragged
edge), I think it could be a problem.

I'm making a couple assumptions:
1. One of the reasons 2007 and newer cars are approved is due to more advanced knock control and, perhaps, compensation for the introduction of the 10% ethanol blend around that time.

2. Ethanol, having a lower per-volume energy content, requires more of it to keep the mixture stable.... so replacing 5% volume of 93 octane gasoline with ethanol is similar to reducing the amount of fuel delivered by a small amount (2%?)

Curious your thoughts!
Old 10-14-2010, 07:30 AM
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