dunk Posted May 9, 2009 Share Posted May 9, 2009 I have a question about the legality of running water misters in the brake ducts of a race car. I can't find anything specific in the CCR about this. Water would be misted into the head of the duct using a small nozzle (less than 2gph). It would be atomized and turned to steam well before hitting the inner hat of the rotor. A 1 gallon tank would provide over an hour of brake cooling. No water would ever hit the track surface. SWC Cadillacs used a similar system and I've found some other race cars that have also implemented it with some success. I'm just not sure of the legality with NASA. Here's a link to a good discussion on the process on NASIOC (subaru forum) http://forums.nasioc.com/forums/showthread.php?t=1759126&highlight=take+brake+ducts thanks, Duncan Quote Link to comment Share on other sites More sharing options...
Renesisfury Posted May 10, 2009 Share Posted May 10, 2009 I personally prefer the "water-cooled" F1 brakes, where they basically dumped the water at the start to get a lighter car. Quote Link to comment Share on other sites More sharing options...
Trevor57 Posted May 10, 2009 Share Posted May 10, 2009 From the time trail rules. Don't ask me about the other series 25) Brake duct addition or modification, including electric fans (water sprayers are illegal). Two holes may be cut or drilled out of the front fascia for brake air ducts. Any hole providing improved intake air to the engine will be assessed one (1) point under Engine Quote Link to comment Share on other sites More sharing options...
dunk Posted May 10, 2009 Author Share Posted May 10, 2009 This would be for a ST2 race car. thanks for all the comments so far. -Duncan Quote Link to comment Share on other sites More sharing options...
kbrew8991 Posted May 11, 2009 Share Posted May 11, 2009 that'd be a great Greg question. It might be ok in ST, I don't see anything prohibiting it. If that is an oversight or not is a really good question... Quote Link to comment Share on other sites More sharing options...
FlyingDog Posted May 11, 2009 Share Posted May 11, 2009 I would guess that it's legal. It doesn't hurt to ask. Quote Link to comment Share on other sites More sharing options...
National Staff Greg G. Posted May 11, 2009 National Staff Share Posted May 11, 2009 It doesn't say that they are illegal. So, under the ST Rules (which allow all performance enhancing mods except those stated to be illegal) they would be legal. Quote Link to comment Share on other sites More sharing options...
Renntag Posted May 26, 2009 Share Posted May 26, 2009 What pressure would you expect to pump to? What type of nozzles? Would they only pressure activate? I have also thought about this technology for bigger cars that cant get adequate brake cooling. Quote Link to comment Share on other sites More sharing options...
dunk Posted May 26, 2009 Author Share Posted May 26, 2009 I'll be using a 75 - 100 psi demand based pump using a NC solenoid hooked to the brake switch for activation. Nozzles will be misting type in the 20-40 micron range. I'll mount them at the front of the brake ducts to ensure compete atomization by the time it hits the center of the rotor. These systems have been used with some success in TRANSAM and SWGT. You can source the parts from either MCMASTER or any of the companies that sell water injection parts. -Duncan Quote Link to comment Share on other sites More sharing options...
Ernesto Roco Posted June 4, 2009 Share Posted June 4, 2009 Your brakes should'nt be getting that hot where you need to pump water on them to keep them cool. I would look elsewhere to keep the brake temps under control. That does'nt sound right at all and besides why complicate things with pumps and tanks, etc..? Check your calipers for drag and try braking less.. Quote Link to comment Share on other sites More sharing options...
Andrie Posted June 4, 2009 Share Posted June 4, 2009 I agree with Ernesto. And the only times the SWC guys allows water cooled brakes is during street course only IIRC. Quote Link to comment Share on other sites More sharing options...
Ernesto Roco Posted June 4, 2009 Share Posted June 4, 2009 I think I may have an anomaly because I can't get my brakes hot enough sometimes.. I have not run brake ducts in my car forever and my rotors lasts forever. My fronts can go for over 3 years and pads 1.5 times per year. The rear rotors have been there for almost 9 years and never been replaced but rear pads about 2 times per year. This is on an AIX car with downforce and sticky tires on 18 X 11 wheels and NO brake ducts. Quote Link to comment Share on other sites More sharing options...
nape Posted June 6, 2009 Share Posted June 6, 2009 What size rotors are you running, Ernesto? I was looking at the pics in GRM and I was guessing they were a 13" x 1 3/8" front rotor. How many races do you run a year if you're getting 3 years out of front rotors? Quote Link to comment Share on other sites More sharing options...
Ernesto Roco Posted June 7, 2009 Share Posted June 7, 2009 What size rotors are you running, Ernesto? I was looking at the pics in GRM and I was guessing they were a 13" x 1 3/8" front rotor. How many races do you run a year if you're getting 3 years out of front rotors? The front rotors are 13" X 1.25".. I run about 5-6 events per year including the Nationals.. Quote Link to comment Share on other sites More sharing options...
awdracer Posted July 8, 2009 Share Posted July 8, 2009 I ran water cooled brakes on my lapping car a few years ago. It was a 94 AWD Talon that weighed... a lot. I designed a front brake system for it with Porsche Boxter S 4 pot calipers and the 2000 Cobra 13" rotors. I still got some brake fade and I added the water sprayers. I used an Aquamist nozzle and solenoid with a 100 psi shurflo pump and a 1 pint accumulator. It worked great. I could get the brakes to recover after fading by using the sprayer. I left a tiny bit of heat shield on the hub and mounted the nozzle to that so that it sprayed into the cooling vanes. I tied the system into the rear brakes lights so that when I touched the brake, the solenoid opened. Quote Link to comment Share on other sites More sharing options...
eclricochet Posted July 8, 2009 Share Posted July 8, 2009 I agree with Ernesto. And the only times the SWC guys allows water cooled brakes is during street course only IIRC. I know Dunk and I know the car. This guy is running the best of the best when it comes to brakes and uses his brakes only when needed. Before he was building for ST2 I think he ran a 2.04 at VIR Full.... If Dunk is doing it, he needs it.... --Doug Quote Link to comment Share on other sites More sharing options...
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