GrantG

New Pana Turbo S Hybrid has even larger rotors than 918 and previous GT cars (420mm dia and 40mm thick!). Guess these come to new GT cars??

And 10-piston calipers??

robmypro

That thing is probably pretty heavy, so assuming it needs bigger brakes. Not sure the GT3 does!

GrantG

Yeah, that thing is a tank but it also has regenerative braking which takes much of the thermal load away from the rotors. I would not be surprised to see this upgrade on GT2 RS and maybe GT3 (might become a track benefit finally)...

Also speed has much more impact on braking requirements than weight (squared function vs. just simply proportional). Of course that Pana TS Hybrid is both very heavy and very fast...

GrantG

Another cool thing about those 10-piston calipers is that they probably have top mount pads (probably at least 4 pads per wheel) where you don't have to remove the calipers to change pads (like the good ole days)...

Here's a 12-piston caliper for ideas of what it could look like (each of those rods is unthreaded and removed and pads pulled out the top when changing pads). I could image one longer pad and one shorter pad on each side of the rotor with 10 piston design:

http://www.autoblog.com/2007/04/20/w...iston-caliper/

Multiple smaller pads will help with the pad taper wearing problem...

Nick

Grant, other than the benefit of no brake dust, I have a hard time justifying the cost of PCCB's. Porsche regular brakes are phenomenal.

GrantG

I understand, but you don't do track driving. Changing pads and rotors on the new cars is a PIA (especially with center-lock wheels). Have to pull the calipers just to change pads with risk of stripping threads in aluminum uprights every time (many convert to studs for this reason). Also, if driven hard the piston pucks crack and there are no spare parts available, so you have to spend thousands to replace the entire caliper when this happens. Brake pads wear with a taper - need to replace them prematurely. Brake dust piston seals melt or vaporize if you have to stop without a cool-down lap (requires caliper rebuild). There are plenty of areas for improvement in the stock brakes for those of us who like to track...

PCCB brakes (aside from being incredibly expensive) offer the advantage of higher thermal limits and less frequent pad/rotor changes (should be really amplified with the now much larger discs) - this means less frequency of removing the wheels/calipers and all the attendant headaches I mentioned above. Now if only the tires would last longer too...

RealityGT

wow 10 piston fronts!

vantage

Grant, or they could just go back to 5 lug

GrantG

That would be awesome (but these PCCB's would still be a big benefit with regard to much easier and less frequent pad/rotor changes).

ipse dixit

I beieve the Cayenne Turbo also comes with those new 10 piston PCCB.

GrantG

Looks like they have the optional PCCB 420mm discs but only 6-piston calipers on the Turbo - but you get 10-piston on Cayenne Turbo S - interesting...

I guess we'll find out in a few days whether these huge brakes are reserved for trucks and sedans or GT3 also...

Just in time

Adding PCCBs as standard equipment will most likely drive the MSRP of the .2 GT3 into a rarefied area. Not convinced PAG would do so. The PCCBs are fantastic but market considerations would likely dictate keeping the standard rotors unless PAG wants to push the GT3 into another ZIP code.

GrantG

I don't think anyone expects .2 GT3 to have PCCB standard (but GT2 RS probably will). Would make me consider PCCB option though (when ordinarily I wouldn't give it a second thought).

tstafford

That would **** me off! Probably the one thing that would cause me to regret buying the RS and not just a .2 GT3.

GrantG

I found a cut-away render of the 10-piston calipers from the Cayenne Turbo S. Interesting that there are two rows of pistons still using just 2 pads per wheel. Also seems unlikely that the pads slip out the top. Sorry for the tangent - I now doubt that these are destined for the sports cars (they were around at time of 991.1 RS launch and not used then).

I guess it's back to plan A: Iron rotors with Race Technologies (Brembo) RE-10 pads (and lots more money in my wallet).