DannyTrinh

Anyone done the rear bumper cut on their 90-93 integra?

People been using the speed holes/"diffuser holes" or whatever, but I've been wanting to just go ahead and cut the rear bumper in half.

Could I see photos of other member's of DA/DB that has done the same before I do it?

Thanks guys!

Oh, and no this isn't for looks/show or whatever people do when cars meet up and stuff. I really want to see how much time I can reduce by trying this.

http://image.superstreetonline.com/f...ut-rear-bumper

Caoboy

If you really want to see how much time you can shave, when you get to the track, take off your rear bumper cover and bumper.

That'll let you know if it's worth it. An old thread had somebody mention that they were a 10th of a second faster.

Lau Cac Bo

Unless its a dedicated time attack car. It's a waste of time and effort of a mod. Similar to painted tires on non sponsored street car.

billabongrob

iTrader: (1)

Yes, I have, on my dedicated track car, and it's ugly. The spare tire well dips down so low that the change in aerodynamics is negligible. Note how I did this on a used old junkyard bumper just for testing.


Also worth mentioning... painted tires on non-sponsored track car :D

Maciel

Is it just for looks or does it have a purpose?

billabongrob

iTrader: (1)

It's supposed to reduce aerodynamic drag. On a lot of cars, the rear bumper can act like a parachute. Holes in the rear bumper can reduce that, in turn maximizing top speed. On these cars, probably not very helpful. I'd imagine 1-3 MPH at the top, depending on the weather and other things.
Alternatively, a real rear diffuser performs a bunch of magic and can help your car stick to the ground better, but I'm not getting into science here.

Lau Cac Bo

I can tell. No rear impact bar. -20lbs!

billabongrob

iTrader: (1)

yeah, still have to work on the front. Just toying around right now. That car isn't street driven, so I'd recommend not messing with that on a street car. Towed to and from road courses.

That car is probably getting close to the 2000 lb mark with a full custom weld in cage. Still need to ditch quite a bit. Would rather put ballast down low than have weight up high, or at the business ends of the car. But again, I digress; science!