Quote:
Originally Posted by JulianEdgar
That's being unduly defeatist. I've achieved excellent on-road results in improving heat exchanger efficiency (in that case, an underbonnet intercooler) with simple on-road testing and modification.
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The context has to do with a certainty of the quanta being unimpeachable under strict SAE testing protocols, and all data reduced to standard SAE atmosphere.
Any drift in atmospheric pressure during the course of the exercise, for instance, would be enough to throw a caution flag on the play. And call into question, the accuracy of the observed numbers.
We're talking about small fractions of total drag, and some 'signals' could be lost in the 'background noise'.