Quote:
Originally Posted by Blue Streak 21
A bit off of the subject, but has anyone cut large holes in the bumer of the Panoz to reduce the parachute effect caused by the rear bumper cover? I've seen several Porsche's with their rear bumper swiss-cheesed to allow the air to flow out from the pocket behind the fuel cell. This is similar to cutting a few holes in the rear window to allow better flow out of the driver cabin. An alternative coud be to create a diffuser. Any thoughts on which one might be better, or more effective?
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Jerry, this was the first aero mod that I did to the car. After having the trunk lid half blow off while racing I used a hole saw to cut a row of holes across the back lower edge of the car as can be seen in the photo below.
I did this in combination with other changes but have had no more issues with the trunk lid. I have not had a chance to measure pressure in this area at speed.
Personally if I had the choice between this mod and a diffuser I would add a diffuser as it will certainly be more effective aerodynamically. Cutting the holes is more of a band aid in my view - but it works and costs virtually nothing. A pro diffuser will cost you around US$750 if made from carbon fibre.
Kel.