Thanks, that's what I was thinking too.

 

Since there is still a discussion on hood vents. Here are some pics I took at 12 Hours of Sebring that I thought were interesting.

Audi R8



Audi R8 Hood Vent



Audi R8 Rear Diffuser







BMW Z4 Hood Vents



Aston Martin



Audi R8 Flying Lizard Motorsports



Dodge Viper Display Model





These weren't cars at 12 Hours of Sebring, but it some more pics I thought would be good for future reference

Carrera GT



Rear Diffuser



Rear Diffuser Right



Rear Diffuser Left



Rear Diffuser Left Side Looking Back



Front



Front Brake Duct



Radiator in Front



McLaren P1

Rear Diffuser





Rear Cooling Fan



Front Headlight Duct



Front Headlight duct Exit





Hood Vents





Side Door Ducts





Side Door Ducts Open Door



Bottom Side Door Ducts



Top Side Door Duct (Radiator/Intercooler)



Clutch Cooler Duct



I have a lot more pics, if you want to see more I might have them.

 

Great pics, thanks! Were those Z4 hood scoops sealed to the radiator?

 

Yes they are sealed and the engine intakes go right up to the front grill

Not My Pic

 

I wonder where those hoses go...transmission cooler? cabin vent?

 

Airflow, Cooling, Airflow, Cooling, Airflow, Cooling... such high priorities for proper race cars, and so overlooked/low priority in the minds of many DIYers. Makes me feel good about all the time I'm putting into these two things right now on my own car. Thanks for the awesome pics

 

Which Pic?

Trying something new

That's what I'm working on and it hasn't been done on any other Miata.

I'm installing 5-10 NACA ducts on the underbody and making away for more air to make its way out of the back. Plus the V8's exhaust will come out on either side of the license plate. Still a work in progress...

 

I have a rather odd access to this car. I also have some more shots. I will look for them.

*sorry for shitty pics it was nighttime and was loading it :/

 

Awesome, thanks!

 

So the NACA ducts pull air from below the flat bottom and route it to the top side? Purpose being to decrease under-car pressure? I would also wonder if that would reduce effectiveness of diffuser, but I am not sure.

The stuff I'm working on is all on the front right now, basically reworking all of the airflow (both exterior and ducted) forward of the windshield.

-Ryan

 

Thanks for the pictures. The duct work on the McLaren is jaw dropping.

 

I'm not understanding the headlight duct that exits in front of the front wheel on the McLaren? I've seen a similar setup on some 911s but I can't wrap my head around pushing air out at a 90 degree angle to the flow around the car. It must work if McLaren does it though...

 

Agreed. I think it's a case of "training" that bit of air compared to where they have all the other air directed. They're definitely creating downforce with the ramp, and have created a fence with the bodywork below the headlight which would make the splitter more effective. The inlet and exit area seem to have the same volume, so they're not trying to blast the air out the side of the car.

Honestly, love the technology but not the shape.

 

@3:00

 

The opening on the side of the door next to the 2 ducts is for the rear brakes. Here is a pic of the rear brake

 

The one of the z4, you can see flexible hose running on either side of the engine from the front but they don't go to the brakes like normal. It looks like they go through the firewall and into the cabin

It looks like someone has already done what you're trying This is a miata right? :P

 

Venting air above the rear diffuser is definitely common practice among race cars. Usually it's slower moving air that has already passed through heat exchangers, transmission tunnel, or a rear engine bay.
Less common but very cool is pulling fast-moving air from the sides and channeling it to the top of the diffuser to fill the space behind the car. Some LMPs have done this. Not sure how similar of an effect taking air from below the car would give, I'd be concerned about possibly decreasing diffuser effectiveness.

-Ryan

 

Indeed however as long as the net result is better than before you dont really care if you lower the diffuser efficiency.

 

As a drastically simplified rule of thumb, downforce > reduced drag, so I'd expect that reducing the diffuser's effect to reduce drag wouldn't add up to a net improvement. In lap times, that is. If we're talking fuel economy that's a whole different ball game

-Ryan

 

Here are a few designs that DP Cars have on their BEC's, It is something close to what I'm doing





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