Quote:
Originally Posted by Taylor95
A future project I have been thinking of is modifying the spoiler on the Camry to be slanted downward slightly and to have a clean separation edge. This will serve to reduce the wake size (something Julian Edgar talked about in his video about the Mirage). This will be coupled with a full undertray and a rear diffuser that will be angled slightly upwards.
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The downwards-angled spoiler extension will work in reducing wake size only if there is attached flow ahead of it. (That's certain on a hatchback roof like the Mirage; it's to be expected but not certain on a 2007 Camry.)
Also, the greater the downwards angle of the extension, the more drag created as the attached airflow wraps around this curve. Therefore, the best trade-off between reduced wake size (reducing drag) and attached airflow around the spoiler (increasing drag) can be found only through testing. For example, throttle-stop testing or mileage over a short, flat, repeatable course at the highest speed possible.
The upwards sloping diffuser will again only be effective in reducing wake size if there is a relatively smooth floor ahead of it, basically to the front of the car. In a car of that age, I'd expect that to require an undertray. Again, though, this is easy to test - pitot tube, tufting (if the car is high enough), even pressure testing.