VGLNTE1

Id love to, but just dont have the time

RX-Ben

Who designed it? Does it actually work?

VGLNTE1

judging from how that looks, im sure it works. No idea who designed it, or I would ask them. Just saw this in a diffuser thread in gen section

Rob Willis

That on a c5 or c6?

Looks like a C6 rear.

C5Natie

Ive been looking for a rear diffuser like that. Thatll be sweet.

db2xpert

If somebody had anything like that tested in a wind tunnel .....

VGLNTE1

Just use CFD. and test it on track.

AU N EGL

His IIRC

db2xpert

Exactly how would you test and verify a performance improvement by running it on a track?

VGLNTE1

Is that sarcasm?

MJM

That's a rather steep diffuser. I would like to see the wind tunnel data that proves it creates downforce and doesn't have flow separation.

AU N EGL

I think the designer is an aerodynamics engineer.

This is NASCAR county, we have four Wind tunnels here in NC.


The little aero I have on my car, splitter and spoiler, once the car's rake was set up properly, the difference on high(er) speed corners was immediately noticeable.

db2xpert

Wind tunnel will provide real data. Some wings and splitters have been designed and tested, most probably not. There may be a significant difference between those designed and tested in a tunnel.
Did you get a bigger SOP improvement from putting on the splitter and spoiler, or from adjusting the rake after they were on?

I'm not suggesting you didn't get a big overall improvement, since I run both splitter and wing on both cars, and felt the difference on each when they were added. And saw the lap times drop.

I am suggesting that the overall performance benefit may be anyplace between miniscule and fantastic. You can determine this in a wind tunnel, or with a real pro driver that runs consistent lap times within .1 secs..... bolt it on and see what he does. That also needs to be a fast bolt-on install to avoid atmospheric and track temp differences.

IMO, coast downs are not reliable metrics unless you have a ton of electronics to measure everything.

0Louis @ LG Motorsports

There is a MAJOR flaw in that undertray.

froggy47

I'm going to take a WAG, that flowing from front to back, the really sharp angle that takes place from the curving part to the flat part (which would position approximately parallel to the ground) shouldn't be there?

You may laugh, but I always like to think of fish and airplanes and would you see an angle like that (in the flow direction) on either?

Seems like a turbulant low pressure area would develop (sort of just where you don't want it).

AU N EGL

maybe that is way it was one of a kind. testing it out.

VGLNTE1

The rounded section instead of flat?

The p1 car in alms. The Honda is all cfd. Never saw a wind tunnel, and its destroying the compitition. With todays tech, we don't see silly tunnels with smoke wands. ;-)

Falcon

Wanna bet?

Come over here and park on Mazeppa Road in Mooresville and watch all the traffic coming and going from the wind tunnels.

VGLNTE1

A lot of people use carburators still too.

db2xpert

Right, that's why GM developed both C5R and C6R pieces in their windtunnel.