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Originally Posted by SDMCF
I was recently at a rolling road session to map a 2 litre turbocharged competition engine for different set-ups:
- 102 Octane racing fuel with a 34mm diameter air restrictor
- E85 Pump fuel with a 34mm diameter air restrictor
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Does it feature port-injection or direct injection?
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the engine produced 2.0% more power and 2.5% more torque when running on E85 compared to when it ran on 102 octane racing fuel
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Usually a larger difference in power has been reported for the flexfuel cars running on regular gasoline and E96h in Brazil, to which the lower octane rating of the gasoline may explain. Torque on the other hand sometimes remains exactly the same or at a much narrower difference.
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We did not measure fuel usage rate on this test but experience during competitions shows the engine uses about 30% more fuel when running E85.
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Once again, rule of thumb dictates a 30% higher fuel consumption on E96h than on Brazilian gasoline which nowadays has around 22 to 27% ethanol, even though actual results may vary according to each engine's specifications and features.