GreenmanS2000

I hope you have a trailer and remember to SORN it ...

zzkamikazezz

Ive read the idea that the bumper fills up with air and that can act as a bubble though, causing other air to run over the bubble.

Im not sure how true that is but I can see the thinking, much like the fact that it is better to have the tailgate of a pick up folded up rather than down when the truck is empty to get the best mpg, as that also allows a bubble of air to form.

MB

Where did you read that!?

cali

Are you going to keep the stuff you're taking off?

zzkamikazezz

On here actually!

I never clicked through and read the thread referenced though:
https://www.s2ki.com/s2000/topic/858...umper-venting/

I'm not sure what to believe works the best.

MB

Thought it would be on here and in the US forum

Bubbles of air don't exist above water afaik, you get areas of lower pressure and areas of turbulence. I can safely say the rear bumper adds drag.

I think a diffuser / flat floor is key to go with it though.

zzkamikazezz

A bubble was just a good way to describe the area of low pressure that builds up. I've just given the thread referenced in the link a read and it didn't seem to be conclusive and there were a few knowledgable people that have designed car areo professionally posting. I always thought it would help having a vented bumper but know Im just confused

James_JDM

I saw that on mythbusters!

MB

Don't be confused. Next time you are doing 100 leptons, stick your hand out the window

Is the area of low pressure behind it helping you go faster?

NicoS

Maybe there's a reason why tuners like j's racing, powerhouse amuse and asm develop bumpers with holes in them though? just a thought. Granted their cars are fast because of handling and power modifications but they spend a lot on aero r&d also.