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Old 05-04-2020, 12:26 AM   #23 (permalink)
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Originally Posted by California98Civic View Post
The throttle stop testing method is smart. However, during any given testing effort wind, tire temp, ambient temp, road temp, reliability of the throttle stop material, drivetrain temp, accuracy of your GPS, and alternator charging will all still be variables. Several of those factors are not factors in a 50 mph to 0 mph coast down test. These are different methods, useful for different things and conditions.

Two things.

1. I have tried both methods, and I don't think you have. So I am speaking from experience, and I don't think you are.

2. One good way assessing the quality of a testing methodology is to make a change that gives a known outcome, and see how the test outcome reflects that change. Like, open/closed windows. I couldn't see any difference with coast-down testing; I can certainly see a difference with throttle-stop testing.
Modifying the Aerodynamics of Your Road Car

A really good book that should be added to the library of everyone working in automotive aerodynamics, as well as those making car aero modifications at home. - Rob Palin, former Tesla aerodynamicist
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