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I'm not sure how relevant this is, but 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
(The air restrictor is mandated in some competitions to try to cap power outputs).
With the same air restrictor, 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. In both cases of course the air restrictor is the main limit to maximum power. 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.
We also ran a test using E85 Pump fuel with no air restrictor, but we didn't test the 102 octane with no restrictor. Removing the restrictor increased maximum power by 17.4% but barely changed the maximum torque (0.5% improvement).
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