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Cayenne 18Z caliper largest possible disc diameter?

I have been offered some front discs for almost free which will fit on the S4 (B5) but the diameter is 375mm...... as I am trying to put together a BBK will these fit in Cayenne 18Z calipers?

What is the biggest diameter disc an 18Z caliper can handle?
aposegil

With out making custom carriers to take bigger discs its 352mm

i did ask ages ago if anyone would be interest in some carriers but got no feedback
camouflage

argh.... so with custom caliper carriers i could use a bigger disc?

what would the biggest disc diameter be then? could i use these 375 discs or is that a step to far?
aposegil

hard to comment as a 375mm discs as you have to know pad surface area and thickness
camouflage

well thats easy to answer as i have found some info on the disc.

375mm Out side diamter

225mm inside diameter of brake contact face

32mm thickness

after a little mathes it has a 75mm wide contact face for the caliper pads.

Is that enough?
aposegil

thickness is right. sadly i do not have a pad at hand i can measure. If you can get a pad and place it on the discs surface it will give you a good idea if its worth getting carriers made up
camouflage

well the free disc idea might be out the window as the new rims i have wont clear above a cayenne caliper 18z and 355mm disc combination.

What 350/355 discs are people using on the 18z caliper conversion?
All the info i can find is on the 330 17z caliper conversion....

I have found that a Jaguar XKR 4.2 Supercharged 06- disc is 355 x 32 which only needs new bolting holes and a bore spacer and its height is only out by 2mm away from the hub which is means 2mm off the caliper lugs. All of which is very easily do-able.
But i dont know the pad swept area on this disc?
Does any one have a full dimension drawing for this disc?
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