BIG brakes
 

anyone put Cayenne calipers on the front of a RX7 yet? the 6 piston monster calipers...

or will I be the first ;)

yes, I have plans to balance them out with the rears...

john

Why?

why have you posted 8893 times?

You do realize that there's a hell of a lot more to it than machining brackets and attaching the calipers and lines?

You'll need to calculate the effects of a changing the piston size, swept area, rotor thickness, etc. This will require such parameters a wheelbase, weight/weight distribution, CG, line pressure, pedal geometry, brake bias, booster ratio, MC area, etc.

Adding larger rears complicates this further and will no doubt require removal of the stock brake booster and utilization of dual master cylinders with a bias bar.

Or you can buy brake systems that were designed for our cars by brake engineers (Stoptech, AP, etc.)

Gene

I have an excel spreadsheet to calculate that...and have.


john

No thanks, I've my own. You've done your homework, apparently. Would recommend against AL caliper pistons up front unless they're ventilated. We had issues with the AP 5200s and had a batch machined from SS as replacements. Additionally, if you're road racing, I also recommend high temp dust seals and boots (if applicable) on street-based calipers.

Gene

you guys located in the same state?:peace:

I dunno. I'm in Seattle. John?

:rolleyes:

Your initial post sounded just like 20 others posted here by clueless people who just wanted "really big brakes".

I've not heard of a single FD owner experiencing fade problems running 13-inch rotors with good track pads/fluid, no matter the track or horsepower levels. Kits designed specifically for the FD from AP Racing and Stoptech cost $1900-2500.

In 99.99% of cases, that level of upgrade is suitable for all track driving, even for high hp cars. Anything bigger is simply more unsprung weight that is not necessary.

Given the costs of a Cayenne brake setup (shudder), and then the difficulties involved with actually achieving a mounting solution and balanced braking, I fail to see why you would do this. Which is why I posted, "why?".

portland

the pistons aren't aluminum...I think they're steel... I do not believe they are the ceramic ones that come in the GT3 calipers. Those have the same caliper bodies...but are radial mount with different pistons. I haven't popped one out to really look at it.
like these
http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

yes, the dust boots might get a bit toasty....but at least they have dust boots ;) vs. a lot of the calipers on the "performance" kits.

I've done some brake stuff in the past. bias bars...alcon b-type calipers on 11.75x1.25 rotors under 15 inch wheels. That was tight ;) But rally cars tend to heat up the brakes a little bit and get pretty crappy ventilation because when you do get ventilation...it is usually about 50% rocks ;)

john