Quote:
Originally Posted by Blacktree
The "speed holes" are a fad in the tuner circles. Basically, they just cut a bunch of holes in the rear bumper. Supposedly, by ventilating the rear bumper, it reduces the aero drag.
Has anyone tried such a thing on an "ecomodded" car? And was there any measurable benefit? I have my doubts, but wanted to ask anyway.
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Opening holes in the rear bumper would increase the drag,not lower it.The bottom of the rear bumper should be close to the elevation of the underside of the car.You want it to pool dead air up where all the naughty bits are,allowing the air underneath to flow smoothly to the rear.
If you're having a problem with wheelspin at high speed,then perforating the rear would allow low base pressure of the wake to communicate forward under the car to provide downforce and traction.It would cost you speed though.
A rear spoiler would be better.