Ok i just got done reading an article on this fast ass integra from Florida, and it has a row of oval shaped holes drilled in the rear bumper. What gives? Less wind resistance? It seems ricey, but kinda makes sense. At the risk of a bonfire of flames, if I had a really fast car, is this a modification that makes sense? Just curious.
Speed Holes?
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BlackJDMdeath
Senior Member
it's called a diffuser. if you think about it... your back bumper is shaped like a parachute. also, the easier the air gets out from under your car the better 
BlackJDMdeath
Senior Member
why on earth would it not be legal? do you have any idea what he is talking about? it's just holes cut in the rear bumper cover. if it helps you on the track to diffuse the pressure under the car and reduce drag, how could that not be good for the street?
BlackJDMdeath
Senior Member
i'm also interested to hear your explanation how people do things to reduce safety on the track. while you're at it, tell me how that reduces safety AT ALL.
vpSPOONsol
Senior Member
by having like 6 big holes on ur back bumper, the bumper loses structural integrity....making it weaker. more prone to major damages in a rear end collison....
BlackJDMdeath
Senior Member
since when did a plastic bumper have anything at all to do with a vehicles structural integrity? come on now.
if all your doing is cutting ovals into the plastic bumper cover its not going to reduce safety
if you are ripping out the bumper supports to make your new high fassion holes functional then it greatly reduces safety
and removing the bumper supports is not legal in many places if any
if you are ripping out the bumper supports to make your new high fassion holes functional then it greatly reduces safety
and removing the bumper supports is not legal in many places if any
so when you buy one of those crazy ass bumpers with all the mesh in them your taking your life in your hands?Hmmmmmm i think not....seriously though that cheap ass bumper cannot have any impact on a collision. My wife bumped the rear of our Blazer and cracked the shit out of the front bumper.
vpSPOONsol
Senior Member
actually yes, my front street fighter bumper is fiberglass, and will get fu_ked up sooo bad if i ever hit somebody in the front. when puttin it on, it was also necessary to remove the impact bar, as with many cheap aftermarket front bumpers. so basically if i get hit in the front, im fu_cked....i know the consequences...
also a diffuser isnt holes cut in a bumper
its a solid smooth peice at the rear of the car usually with vertical fins on it used to reduce the turbulant swirl at the rear of the car (reduces drag)
here is a CF diffuser for an NSX:
here is a diffuser on a lotus elise:
its a solid smooth peice at the rear of the car usually with vertical fins on it used to reduce the turbulant swirl at the rear of the car (reduces drag)
here is a CF diffuser for an NSX:
here is a diffuser on a lotus elise:
vpSPOONsol
Senior Member
o, i wasn't refering to a diffuser, i was talkin bout the ovals i see on drag cars rear bumpers....cant find a pic though....
Domeskilla
Senior Member
Do you realize that fiberglass is just a fucking bumper COVER? Your bumper is the steel piece behind it. So fiberglass bumper is no different than your OEM bumper cover, except its heavier and probably a fucking picnic table.
Cutting holes in the rear bumper does NOT hurt it, b/c you are just cutting the cover, not the actually bumper.
For all the people spewing safety BS... even the beam doesn't do much for safety
http://www.nhtsa.dot.gov/.........html
http://www.nhtsa.dot.gov/.........html
