Quote:
Originally Posted by Taylor95
What do those strakes do?
So my Camry sort of has a 6" undertray extending from the front bumper. Could I do a rear diffuser only, or would that add drag?
Approximately how much would this lower Cd by?
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A diffuser will only function if it's behind a viable full belly pan.
The pan, on the worst-case vehicle ( pickup truck/ SUV) is measured at delta- Cd 0.045 improvement.
A 'long' 2.8-degree up-swept diffuser will improve the drag reduction to delta-Cd 0.070.
A 'fast' 4-degree diffuser cuts drag a little less than the 'long' unit.
Any diffuser with an up-sweep steeper than 4-degrees is for high-speed sports cars, or racing.
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According to a research paper on the SAAB 9-3, the diffuser strake/guide vanes help mitigate effects of lateral wind gust, plus decrease turbulence effects due to rear wheels.