bpproducts

This is a 100% functional lower rear diffuser. A must for track days or that ultimate racing look.



http://www.breathlessperformance.com...arDiffuser.asp

Ernie
www.BreathlessPerformance.com
954-925-7725

RC45

Nice piece - anychance of a similar piece fo rthe C5? Or maybe retro fit that one to the C5??

CamaroAJ

+10

bpproducts

Sorry only for the C6 and C6 Z06 as of now but maybe later if the demand is there yes.

First it was tested with and without a wing on our track car and did provide additional downforce. We also went one step further and did a flat bottom to attach to the diffuser for even more downforce. Street guys would not need the additional flat bottom and I find some of the track guys would not need it as well. We actually went about 6 mph faster at Homestead coming off just before the banking on a high speed left sweeper.

Weight is 10.5 with the drop down fences.

It does replace the factory panel.

It is a easy bolt on. Locking tabs on top screws into the factory side mounting holes. and has a brace and bracket that attaches to the lower control arm bolt.

Kooks is making the cat back kit for it and pricing on the exhaust should be between 1000.00 to 1300.00

Yes it could be used for the street it clears speed bumps with ease.

Ernie
www.BreathlessPerformance.com
954-925-7725

John Shiels

Let's see the bottom of the flat bottom. What did you use for material? Thanks!

bpproducts

Aluminum with fences trailing down.

Sorry no pics, that is only for in house cars.

Ernie
www.BreathlessPerformance.com

John Shiels

hope the fence don't catch. People have had problem before with them.

RC45

But if the diffuser needs to work in conjuction with the faltbottom, wont the diffuser alone just be a cosmetic mod?

John Shiels

plus drop down side skirts

bpproducts

The diffuser will work even better wtih a flat bottom. It will still work without it as well.

Sorry no problem with the fences catching.

Ernie

0RAAMaudio

Great, more money down the Vette pit I am digging

Looks very cool functionally and esthetically, I have a WC body to install on my car and the "diffuser" sure looks like it could use some help, this may be just what it needs.

Rick

AU N EGL

Rick

You want a REAL diffuser. Call Kerry

bpproducts

For your fans.

We don’t have a wind tunnel and we don’t have data acquisition apparatus or even load sensors so all we have is lap times and handling as feed back. For drag we perform coast down runs for each setting. Without the above we can only calculate approximate performance levels of each element. IE: front adjustable splitter, rear wing and diffuser. Lap times don’t lie.

Using the formula F= Cl * area we arrive at 3psi for the diffuser which is a total of 480 lbs down force @ 170mph ideally if we were to maintain 2.5“ ground clearance on a smooth track on a standard day. Since the rear ride height is more than that, we have a + rake situation which in itself causes down force because of the ’Wedge effect”. The area and ramp profiles were determined by the space available and no NACA tables were consulted.

The primary reason for the design was to address the unsightly mess Corvette has created at the bottom of the rear valence. Imagine the ZR1 supercar with back up lamps on a fake plastic diffuser. Shucks, this is what we expect from the orient for little city cars. What self respecting V8 has four ugly pipes?

Although it accomplishes the appropriate ’Bling Bling‘ effect, our diffuser also function as designed. If you have all the other necessary elements in place. IE, A proper floor feeder system, droop limits on the rear suspension, ability to adjust total center of pressure, (splitter and rear wing) you will be further able to exploit our new product.

We also have a side feed entry as on the Ferrari Enzo, so we don’t get the full suction peak at entry and the second peak is located at the rear axle. This is because the engine heat is managed down the centre of the car and exits at the opening of the exhaust pipes. This precludes us having a full ’closed in’ floor which would improve the efficiencly of the diffuser considerably.

Our rear wing is designed for engine heat exit over the top of the car as in the factory C6R GT1 cars after which it was designed. There is never the less diffuser energy augmentation caused by the end plates on this design. Since this car is also driven on the street and is used for our product promotion, we elected not to go with a full race car package.

To calculate approximate down force at other speeds at the diffuser we know that lift increases at the square of the velocity. At 75mph we would have 100lbs down force.

With this installation for the street on a stock C6, you will improve your gas mileage at highway speeds because the diffuser allows the air traveling underneath the car a place to expand and decelerate back to road speed as well as providing wake infill. IE: It will reduce total drag.



brian.
www.BreathlessPerformance.com

John Shiels

who did all the CFD?

what affect does the engine heat have over the wing design?

AU N EGL

Wind tunnel testing is not that expesive any more

http://www.a2wt.com/

Woods

Looks like the rear diffuser from a Ferrari 360 Modena

John Shiels

fence on the sides of the car wheel to wheel?

Joe_G

Saw the diffuser on the two Z06's you had at Tower shops last night. They looked good an the Kooks exhaust sounded tough, though not for the faint of heart. of course, with the big cams in those cars any exhaust would sound healthy!

John Shiels

The primary reason for the design was to address the unsightly mess Corvette has created at the bottom of the rear valence. Imagine the ZR1 supercar with back up lamps on a fake plastic diffuser. Shucks, this is what we expect from the orient for little city cars. What self respecting V8 has four ugly pipes?


How stupid of GM to comply with DOT laws for backup lights.

GM also has the engineers and resourses of a wind tunnel to do a ton of testing on aero.

427Z0SX

I like my Vette with 4 tail pipes.