NACA brake cooling duct project

[ihasnostang]

too bad airflow isnt that easy to measure, would be interesting to see what kind of pressure/ air speed you're getting in there. maybe fill one naca duct with sawdust and accelerate to see how much blows out. or tape a smoke bomb just after the inlet? .

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[GJarrett]

Generating sawdust and smoke would certainly be a good way to earn a meatball flag next time out LOL. I'm pretty sure this DIY has fairly limited effectiveness compared to ram air through the fog/driving light openings but I didn't want to take those off and figured the NACA's are better than nothing. It would be easy to install some 140cfm inline blowers on the ducting which I am confident WOULD make a big difference - and they are cheap (less than $30 each plus whatever wiring and switch I connect to them). I am probably going to do that and call it a day for my brake cooling project when done.

 

[NightmareMoon]

too bad airflow isnt that easy to measure, would be interesting to see what kind of pressure/ air speed you're getting in there. maybe fill one naca duct with sawdust and accelerate to see how much blows out. or tape a smoke bomb just after the inlet? .

I think I could almost jerry rig a Kestrel wind meter into a duct and measure velocity. Its not really designed for that but if I already had a splice in the duct tube It would work.

 

[SVO MkII]

Thought I'd just add to this thread. I fabricated some custom ducts on my undertray that emulate GT PP ducts, but I think are a bit bigger. These feed Vorshag deflectors. I have GT PP 6 piston Brembos on the car. Next track event is Road Anmerica on 5/1-2. Haven't had severe brake cooling issues with the 6 Piston Brembos, but this can't hurt.

 

[Plimmer]

Did a similar thing to my car. The duct is much more convenient than the hose, I’ve crunched a new hose backing out the garage after just replacing it

 

[ZPD]

Did a similar thing to my car. The duct is much more convenient than the hose, I’ve crunched a new hose backing out the garage after just replacing it

Sorry to get off topic here but can you tell me about that tube with the strap on it? Is that replacing your front crash bar?

 

[1 old racer]

I am gonna have to do this for the rears

 

[Plimmer]

Sorry to get off topic here but can you tell me about that tube with the strap on it? Is that replacing your front crash bar?

Yeah, its a Watson Racing bar. It’s lighter and allows more air flow around it. I put a loop strap around it and then cut a slot in my bumper. Haven’t used it for towing yet, and hope I never do.

 

[Scootsmcgreggor]

Did a similar thing to my car. The duct is much more convenient than the hose, I’ve crunched a new hose backing out the garage after just replacing it

Looks good. Which tunnels are these?

 

[Plimmer]

Looks good. Which tunnels are these?

https://ajhartmanaero.com/straight-splitter-tunnel-front-diffusor/

 

[Scootsmcgreggor]

Thanks

 

[ihasnostang]

It would be cool if it was possible to use a brake duct like in F1. Slapped something together quick, obviously there is a lot of suspension components to go around. Ideally you would want the inlet at a height similar to the bellypan. Would it be more effective than the deflectors from an airflow volume level, probably not.

 

[boardkat]

This is what I had a friend design:

Had to lengthen the endlinks and notch the frame to gain some additional clearance, but no crushing/punctures to date. Inlets are in the high pressure zones next to the upper/lower grilles (made some 3D-printed inlets and had to relocate the intake tube/filter)

Front brake temps didn’t exceed 392f @ COTA braking down from 175-40 on the back straight, after having issues elsewhere at lower speeds prior. Great success!

All this said, I do have AJH tunnels I’ll be installing on the splitter eventually (tight packaging with the SC pump in the way currently, and not making enough rear dF to match yet), and will test a diverter setup at that time.

 

[sldghmr]

Yeah, its a Watson Racing bar. It’s lighter and allows more air flow around it. I put a loop strap around it and then cut a slot in my bumper. Haven’t used it for towing yet, and hope I never do.

I've got the exact same bar and am sorry to say that I have had to test it.... it passed with flying colors...unlike my late braking turnin entry

 

[Red65]

He is running hoses from the ducts to a set of plates at the brake hubs, no need for the PP lower control arms. That factory set up on the PP car is a bit of a farce in my mind, I think the benefit is minimal at best when all they are doing is deflecting air in the general direction of the rotor hub.

A while back I read a forum post where someone did a test using the PP air deflectors vs an air hose setup that pulled air from the factory fog light location. They actually found the factory air deflectors to be more efficient due to more air volume over what the cooling tubes would allow. Someone actually sells arms with even larger deflectors that supposedly help even more.

I would be interested to see this system compared to a factory PP setup just to see how it stacks up since the factory setup actually works pretty well.

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