I have read in a number of mags and searched discussions on this board that people are putting additional brake cooling in 993's beyond the weak scoops underneath the car. Specifically I have seen the TechArt solution but not sure this is really that effective since the are is only deflected toward the inside of the wheel.

Factaully speaking, who out there has actually run air all the way to the rotors from the air ducts in front for a 993? Is that the best cooling method or are there other ways to accomplish this effectively?

Thanks for the help!

 

I have never had a satisfactory solution to using the brake ducts in the front PU. I have the larger type fitted but use them purely to feed the oil cooler.

I went to a UK racing team called Barwell Motorsport. For around £200 they cut a large hole in the front undertray and fitted a large scoop duct(flush fitting so no clearance problems). This had a 'Y' piece at the back and two short 2.5" flexible tubes feeding the caliper backs. I think the tubes are secured to the steering arms/rack. It's simple, neat and cheap. It's the solution they use on their 993 racers so it is more than man enough for track days. It's been on around a year now and hasn't needed any maintenance etc.

The scoop sits in an area where there is a lot of cold air and the tube run to the calipers is very short giving minimal fiiting problems and maximum air movement.

Sometimes the simple solutions are best!!

 

Peter,

So the cool air is aimed at the caliper.

Did you have to make any changes to the disc (rotor) backplate 1) to fit the RS discs, and 2) to aid the cooling of the disc?

I assume the backplate can be removed and (I'm guessing here) will be particularly helpful reducing heat soak when you park the car after a few "hot" laps?

Anyone done this (remove the backplate), do any components like ABS and wear sensor connectors require heatshielding?

 

For the tracks that we run in SoCal, Willow Springs International Raceway, Streets of Willow, and given that we only go out for 20 minutes at a time, I seriously doubt, based on my personal experience, that you will need any additional brake cooling. The factory scoops attatched to the control arms seems to work just fine on my car. I ran my car at least six (6) times at the Streets of Willow in 2000 and 2001, a track known to be hard on brakes...I experienced no fade at any time. When we were at Fontanta last May, with several major braking areas, no fade experienced.

Just arrive at the track with fresh Super Blue, recently bled calipers, pads in good shape, and you won't have any problems. I assume you have Big Reds as I do. Big Reds will run a little cooler than the standard 993 caliper due to the size and thickness of the pad.

By the way, the factory 993RS splitters have a brake cooling channel that directs air toward the standard scoops on the control arms. You already have the 993RS side skirts, have Gert fix you up with the splitters. They are made from polyurethane, not fiberglass, this is a good thing. They wont readily break.

Keep upgrading that car!

 

The back plate can be removed if you wish. I left it on, with the intention of removing it if I had problems. I didn't so they stayed on. The RS discs and cooling didn't need an mods. Contact Mark Lemmer at info@barwellmotorsport.co.uk for more details on the cooling. He can probably give you duct and scoop sizes.

Peter

 

Here’s a solution. It involves extending the existing brake cooling fins. I haven’t tried it myself, so I can’t speak from personal experience, but it looks good. Cheap and reversible, too. Like Kim said, they might hit the ground. It’s from the San Diego chapter of the PCA.

<a href="http://www.pcasd.org/tech/tech_apr.shtml" target="_blank">964-993 Brake Cooling Duct Upgrade</a>

Tom
’95 993

 

Just to support the view that directing air to the rotors (preferably between the disc faces into the vanes) is the way to go, my RS plus Techart brake ducts seems to cool the inner face of the disc more than the outer face based on the fact that the outer disc face cracks sooner than the inner, and the outer pads wear slightly faster than the inner. Whether this mod is absolutely necessary is another matter only the individual can decide.

Rocket

 

[quote]Originally posted by Silver Bullet:
<strong>I've also read that the rear dust shield can be removed in this case, but haven't done so myself.</strong><hr></blockquote>


ARe you talking about the shield for the rotor?
We didn't remove the rear ones on my race car because they also provide a heat shield to a suspension bushing (I think it is the camber link).

 

[quote]Originally posted by Martin:
<strong>For the tracks that we run in SoCal, Willow Springs International Raceway, Streets of Willow, and given that we only go out for 20 minutes at a time, I seriously doubt, based on my personal experience, that you will need any additional brake cooling.</strong><hr></blockquote>

O.k. so my car is lowered, I have the RS or GT2 style from splitters (and side skirts) and when driving the Streets of Willow in reverse, I would sometimes come in after a session and my front brakes would be smoking. I really need to run a FULL cool down lap without touching the brakes to cool them before exiting. I ran hoses from the front bumper to the front brakes, there was the issue of the wheel rubbing and while I made every effort to secure the hose out of the way. The third day on track I ripped one of the hoses out. Interestingly, I came in one session and one side was smoking and the other not. I guess they do provide some cooling effect? As for extending the frnot brake scoops, not much help if the car is lowered because then they start to scrape, DOH!!

Hot brakes a go go!!

Dylan.

 

when driving the Streets of Willow in reverse
Does your neck hurt after that?

 

[quote]Originally posted by Phil McGrath:
<strong>when driving the Streets of Willow in reverse
Does your neck hurt after that?</strong><hr></blockquote>

DOH!!!! <img src="graemlins/c.gif" border="0" alt="[ouch]" /> That's why I need surgery, idiot Stimpy... idiot!!!

 

When I was looking for a kit for the 993,I wanted the Alan Johnson kit. Has a scoop under the A-arm, but it's made of metal (unlike other kits, which have a cheap plastic scoop that easily shatters). They didn't have one for a 993, so I adapted one from a previous version 964 Turbo. I now see they have a 993 unit.

Do improve cooling, but don't expect miracles.

 

I forgot to mention I did remove the backing plates on the front.

A minor rant: In late 2000 and 2001, I did 6 sessions with the POC at the Streets to get used to the 993, and in the process, to go after a class championship in MI. I won my class, but it was not all related to my superior driving, there was very little competition in POC MI Class. It has gotten tougher this past year, so I have heard. I'd probably get spanked, maybe not.

When I first started back at Streets of Willow..I had not been out in 9 years since I sold my 80SC Weissach coupe. Once I felt comfortable with the 993 car...it was off to the Big Track at Willow to get back my Time Trial Permit. This track is much easier on the car, there is no tossing the car...smooth, smooth is the way to get around.

Streets of Willow is a great place to learn car control and there are relatively few places to go off, and by design, the speeds are lower.

However, if it costs the same money to run both tracks., and the Big Track pegs my Fun Meter, I will vote for the Big Track. I will not be going back to the Streets of Willow..it is too hard on the car. I am glad I started back on the Streets. POC mandates this approach.

 

[quote]Originally posted by Martin:
<strong>I will not be going back to the Streets of Willow..it is too hard on the car. I am glad I started back on the Streets. POC mandates this approach.</strong><hr></blockquote>

Agreed. It is tough but a good starting point for people.

[quote]<strong>I won my class, but it was not all related to my superior driving, there was very little competition in POC MI Class. It has gotten tougher this past year, so I have heard. I'd probably get spanked, maybe not.</strong><hr></blockquote>

Hey, you could step up to MP Class? We need some more cars there? So, will you not do any Streets driving? The track is fun in the reverse or, counter clock wise (Phil) direction.