Quote:
Originally Posted by 19bonestock88
SO I got bored at work and had a few min to kill, so found some scrap coroplast and some metal strapping material and tape and made a partial Kamm for my car...
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That's the perfect car to prove or disprove the principles I've discussed about a roof wing with vented and non-vented leading edge.
I say this because of the dirt roads you apparently drive on.
You most likely have a good idea how much dirt you have on your rear window normally, this can be used as a crude measurement of attached airflow, yes?
Now you have your partial Kammback or coroplast, and can observe dirt attachment.
Then you can move back or cut out an air-slot at the leading edge to see if you are getting some Venturi effect.
The dirt has a less chance of settling on surfaces with attached air-flow, yes?
I guess other methods are tufts or rolling down a hill tests, or even your gas gauge.
Tuft testing kammback spoiler and rear wheel skirts in a vw lupo 3l