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Registered
Join Date: Jul 2002
Location: Sydney, Australia
Posts: 2,477
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Brake cooling ideas needed
I toasted my front brakes on a tarmac rally last week (Boxster monobloc calipers, gas slotted 3.2 Carrera discs, pagid blue pads on a 1000kg RS replica). One caliper is so bad I'm replacing it.
Never had any problems during extensive use on the track (including a 1 hour race on a 35+ deg C day). The special stage that killed them was 15kms, super twisty and mainly downhill. Please let me know what brake cooling ducts you have found to work. Pic's would be especially helpful. Thanks - Ryan ps: Cold shiver moment - finished stage (max speed just shy of 200kmh), stopped at timimg point, took helmet off, drove onto public road and brake pedal went clunk against the firewall... |
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10-23-2002, 04:14 PM
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The nicest ducts/diffusers I have seen are these from S-Car-Go
  They are not cheap. The root cause of your brake failure is insufficient rotor mass, the ducts will help, as will Ti or ceramic insulators and high temp fluid and more agressive pads like Pagid RS4-4 Orange & RS-14 Black. If it only happens in that one situation then the solution is to add misters like the rally guys do, bigger rotors(IMO the best all around solution) or don't do that anymore(My MDs solution)
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | Last edited by Bill Verburg; 10-23-2002 at 04:26 PM.. |
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10-23-2002, 04:22 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,786
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This site also has those fancy carbon pieces for brake cooling...... AJ-Usa also sells scoops and hub adapters... as well as many others im sure
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Don't feed the trolls. Don't quote the trolls  http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others Last edited by TimT; 10-23-2002 at 04:46 PM.. |
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10-23-2002, 04:43 PM
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Irrationally exuberant
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Re: Brake cooling ideas needed
Quote:
I kept track of my brake temps (measured on the back of the brakepads) once and to my surprise they got the hottest in the paddock. My codriver had been using the brakes when he pulled into the paddock to park. Using the brakes had left the pads in contact with the rotor while it was parked and the heat from the rotor just soaked into the pad - and the brake fluid. Your stop at the finish stage is what boiled your fluid I bet. The OG Racing Cool Brake (tm) kit has the largest hose (3") of the ones that mount the scoop under the control arm. They also have the hub block off plate lacking in some kits. If your racing is on rough or gravel road stages the under-the-control-arm scoops might be in harms way. -Chris |
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10-23-2002, 04:45 PM
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Potomac region's own Mr McGiver (Kurt Micklewait) developed a water spray system for his front calipers; seems he got the idea from watching the truck racing from Europe. Amazingly, the system works very well. He does drive a 912 on the track, so his terminal speeds aren't that extreme, but the system appears to work pretty well. Now, the good part, he sourced all the material from "stuff" he had hanging around the house. All we can do is shake our (collective) heads in amazement. . .
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10-23-2002, 04:50 PM
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These are from Smart Racing:
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George M '89 Carrera 3.2 '91 928GT '76 914 '18 Macan GTS |
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10-24-2002, 11:08 AM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,943
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This is somewhat home grown but we have a master at making things on this forum. Condisering you are in Oz and might not want to ship things from around the world, the gent below did an excellent job at making his own ducting:
Project little reds and Project little red, part deux
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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10-24-2002, 11:23 AM
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Registered
Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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Ryan,
It sounds like a brake pad issue, and not a caliper issue! Pagid Blues are NOT racing pads, but rather a street/autocross pad ... never intended for 45 minutes of continuous use at DE events!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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10-24-2002, 01:41 PM
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Registered
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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"Potomac region's own Mr McGiver (Kurt Micklewait) developed a water spray system for his front calipers; seems he got the idea from watching the truck racing from Europe. Amazingly, the system works very well. He does drive a 912 on the track, so his terminal speeds aren't that extreme, but the system appears to work pretty well. Now, the good part, he sourced all the material from "stuff" he had hanging around the house. All we can do is shake our (collective) heads in amazement. . ."
Not sure what Mr. Micklewait is using, but we have a mobile misting system MPC) many race teams have used for just this purpose (e.g. TransAm Jag team and ALMS Banana Joes MG/Lola). Here's a setup on a locally-tracked 930:   Sherwood Lee http://members.rennlist.org/911pcars www.seinesystems.com/MPC-Home.htm |
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10-24-2002, 02:16 PM
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1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
The Blue Pheonix
1975 Porsche 914 2.7
1989 Porsche Carrera
1991 Porsche 928GT
1984 VW Rabbit GTI
1984 Porsche 930
