white997

daedton

great question. what about 390 rears too?

Nine1won

I put 410's on my 997.2 RS without issue, but you need to stay with 19" wheels. I went with Surface Transforms and they are great and a lot less cost than OEM.

Nine1won

Oops...sorry I was wrong. Just checked to see what the rear's were and saw that they were 392mm front and 362mm rear. Sorry for any confusion!

pete95zhn

I have 991 GT3 calipers and 380mm steel discs in all four corners. At front I have 997 GT3 uprights (225 mm caliper bolt spacing) and rear 996 GT3 uprights (needs a spacer between upright and caliper), so caliper fitment is not an issue. Requires 19" wheels.

Johnny DB

Someone put the 410mm front and 991 calipers on their 997 Turbo...

turbofreeFLAT6

I have about 8mm clearance between calliper and rim on my 380mm PCCB so I can't see how 410 would fit 19" wheels. Given that the performance of the 380 is ample I wouldn't want the extra mass of 410 anyway. Olaf Manthey said, ‘Removing 20 kg of unsprung weight at the wheels is equivalent to losing 120 kg from the body of the car, as a 1:6 factor has to be applied when the car is moving and that weight becomes mass. In fact, we are conservative with the 1:6 ratio, as Porsche considers it to be 1:7.’ As well as the impact of horizontal, vertical, and rotational inertia there's the gyroscopic inertia that reduces steering response. If you don't have 918 Spyder weight and performance you don't need 918 Spyder brakes.

white997

cgfen

you (and Olaf) are correct
but
MANY people do interesting things in the pursuit of what they like aesthetically.
oftentimes to the detriment of dynamics.

Cheers

Craig

daedton

Maybe the fitment would work is putting the rear 390's on the front and rears on a 997.2 rs with 19's?

I don't think this is necessarily a question of raw performance as it is about availability of decent used parts. There are lots of PCCB becoming available from the 997 era.

So would the 390 PCCB rears on a 991 fit on the Front and Rear of a 997.2 rs?

Elliotw44

Bumping this thread to see if anyone knows info on this.

MJSpeed

No pun intended but, why reinvent the wheel (brakes in this case)? What I did on my car (997.1 GT3RS), and have subsequently done on client cars is;

If it's a PCCB car, change out the OE rotors for Surface Transforms in the following sizes (for 19" wheels):

• 392x35mm up front (caliper spacer required/provided)
• 362x29mm out rear (caliper spacer required/provided)

For a PCCB car with 18" wheels like mine change out the OE rotors for Surface Transforms in the following sizes:

• 380x34mm up front
• 362x29mm out rear (caliper spacer required/provided)

For iron rotor cars change out the OE rotors for Surface Transforms in the following sizes:

• 380x34mm up front (caliper spacer required/provided) - One could also run Surface Transforms 350x34mm w/o the need for a spacer
• 362x29mm out rear (caliper spacer required/provided) - One could also run Surface Transforms 350x28mm w/o the need for a spacer

Incredible performance, ultra light-weight, significantly lower cost than OE PCCB rotors ($13k for ST rotors v. $26k+ for OE), and paired with PAGIDs offer unbelievable performance and advantages, it's why I became an official distributor for them. Oh, and they can be resurfaced!

RAudi Driver

Enlightening news. So folks with the read calipers can use carbon rotors without the need to change out their calipers. Wow game changer for many. Would have been for me if I still had my iron rotor car.