Quote:
Originally Posted by aerohead
One SAE Paper from General Motors in the 1960s reported that the difference in Cd between spinning and stationary wheels was of such a low statistical significance that it didn't warrant the time and expense to test; and spinning tire effects could be easily simulated with trip strips in the tire/wheel area.
Exposed-wheel race cars MUST be tested with spinning wheels.
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Nissan would beg to differ. They test with wheels spining and the engine running to maximise under hood airflow management too.
What was considered adequate by GM in the 60's isn't nessesarily best practise today. It's unlikely we'd have fairly conventional looking 0.22CD sedans with that attitude.