Quote:
Originally Posted by underscore
I don't have time to watch it atm, but I assume they're totally emptying the tank between tests. What are they doing to reset/relearn the ECU between tests?
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He is emptying the tank from the fuel lines between different types of gas, but he did not mention what he has done as far as resetting the ECU or re-learning the fuel trim is concerned.
From Part 1 and Part 3, however, he did mentioned that the car has been running on the type of gas he started the test with for a while -- Chevron 94 blended with E85 to give an E17 blend in Part 1, and pure Chevron 94 in Part 3. So we can only assume at the start of those tests, the ECU has at least adjusted to the starting fuel to some sufficient degree. Had Shell been given the chance to learn the fuel trim, I suspect its numbers would be better than what we've seen in the test, but it'd be too much of a stretch to make up for that 40hp deficit.