Quote:
Originally Posted by Wonderbar
Aero data is super expensive, wind tunnel time is like a house payment per hour. Ill wager my good name (haha) on the increased mpg at highway cruise, exact amount will vary due to driving style.
When I get to NC I will be looking at wind tunnel testing and try to afford it for you guys.
Honestly, once it is blacked out, it's super stealth, take a look at my version 1 prototype on my car in my build thread or the BRZ/FRS rear diffuser thread in chassis/suspension/brakes sub forum.
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Autospeed has a lot of good articles on budget aero testing, you do not need a wind tunnel. Air pressure measurements, for example, can be taken from the void area (between the trunk pan and where the diffuser would be) before and after... a reduction in pressure with the diffuser should indicate a reduction in lift if i am not mistake. You would certainly want to confirm it is not catching additional air at high speed causing parachuting, this i think would show as an increase in air pressure.
You can also use linear potentiometers on the rear shocks (or any two points between the chasis and the control arm) to measure average ride height differences at speed.
Lastly, as you mentioned, the mpg figures (if measured accurately enough) should be able to show a reduction in drag if one is present.
