Brake issues

So you're just gaining thicker/cheaper pads with this swap then?

Just checked and my Hawk 221's (62mm deep) ran me $40/set.

Doc, these are staggerd 6-piston and machined from forged billet alloy and are actually lightweight compared to a cast caliper that weakens with every heat cycling. You can run either a 1.25" or a 1.38" thick 13" rotor.

What Dia. and thickness is the Turbo S rotor?

Not sure. I'm using Big Red calipers with 964 Turbo rotors. Got two seasons out of the rotors/pads which is a record for me.

A 964 rotor is 322mm x 32....cost unknown
I churned out a large batch of Cayenne centering rings and will start on the adapters next week after my LS strut brace is done.

The 964 rotors are $178 each from Sunset Porsche.

I read that there are two types 964 rotors, one with a deep sweep and one shallow. The deep one is the only one worth running.
I got my last set of ATE Cayenne rotors $120/pr ...shipped

docwyte wrote:So you're just gaining thicker/cheaper pads with this swap then?

Rotors are 30mm larger on the cayenne (but same thickness - 32mm).  The larger diamter should translate into better braking and better cooling.  Thicker pads will also decrease heat transfer to the calipers.  The thermolock pistons on the wilwoods will also help with keeping the calipers cooler.

It's hard to believe that you can go two seasons on a set of pads, I blew through my last set in 3 weekends.  If running just at Barber, I get 4 weekends.  I am expecting much greater longevity with the thicker pads, couple that with the decrease in price and I should save $$$ every year.  Also, seals are $16.95/caliper for the wilwoods, but $16.95/seal for the turboS.  

I paid $103/rotor for the stoptechs, but you can find rotors for as cheap as $40. I can get Zimmerman's for $80.

To be honest, I am not expecting a day and night difference in stopping power with the new setup.  Where I expect to see the biggest difference is in caliper temperature and that is critical for racing.  There is nothing worse then a spongy brake when you are 1/2 way through a race, let alone no brakes as was the case at NOLA last month.

xschop wrote:Just checked and my Hawk 221's (62mm deep) ran me $40/set.

I have not found a cheap source for Hawk race pads for the Wilwoods, they are typically in the $300+ range. I don't have issue with that as I've run the Polymatrix A pads before and they are excellent. I'll likely order a set of PFC 7775's in the 01 compound as I've heard good things about them. Again, both of those pads run $150/axle set on Ebay. http://www.ebay.com/sch/i.html?_trksid=p2050601.m570.l1313.TR11.TRC1.A0.Xpfc+7775&_nkw=pfc+7775&_sacat=0&_from=R40

Very nice, I got lucky on those then. Here's what the Dims are on the Cayenne rotors and will mock the adapters up using these dims...

Remember I'm doing Time Trials, not racing. So 3-4 30 minute sessions a day.

Consumables with this kit look good. Pads should last longer and rotors are cheaper.

I'm just curious, why use the 330mm rotors and not the 350mm Cayenne rotors?

money pit 951 wrote:I'm just curious, why use the 330mm rotors and not the 350mm Cayenne rotors?

For me it has to do with keeping my 17" wheels.

So just mocked this up and it fits nicely. You might actually be able to stuff 350's in, but it would be fairly close (approx 15mm clearance).

That looks right. I couldn't get them under my 16" 993 wheels without 12mm spacers because of the inner wheel curvature.12mm spacers would put that past my wheel wells on my 928 with 50mm ET

You can get away with no spacers on cup2 wheels, but need them on BBK 10 spoke wheels.  I run a 1" spacer, so it really does not matter to me.

Cayenne rotors are 4 lbs heavier than turbo S.

After a bit more searching, I am finding all sorts of brakes pads for < $100/axle set