Vilhuer

Anyone know any sources for rotors like in below picture which have around 60mm wide surface area in 350x32 and 322x28 or close to those sizes? I'd like to use non holed versions instead of usual 322x32 993TT front setup but all sources I have found are too narrow. For example Wilwood 14x1.25" (= 355.6x31.8mm) has 50.8mm and 12.88x1.1" (= 327.2x27.9mm) only 43.4mm wide surface. Alcon rotors are similar. Haven't found specs for Brembo's or if they even make non holed setups in correct sizes. Seems Porsche Brembo setup has taller pads than aftermarket setups of similar size rotors.

Mike Simard

Brembo is the best source. You can look at their pdf catalog and pick a variety of configurations with dimensions.
StopTech copies Brembo's sizes and offers cheaper parts. I don't know about their quality.

If you need hats, I have a pair of them made for the 233 bolt circle common to the 355mm rotors. I made these with an offset to fit a 928 using a 32mm disc.
It will be a while before I make more.

Vilhuer

Thanks for the quick reply Mike. Stoptech says Maximum Pad Annulus is 51.0mm for both 355x32 and 328x28. That is 9mm short for big black pads if I understand what they mean by Annulus.

mark kibort

have any hats to fit the coleman rotors and a 322mm rotor? (with the S4 offset?)

hacker-pschorr

Warning - possible dumb question ahead:
What caliper would those be for?

Mike Simard

Good question. You would think I knew, wouldn't you?
I asked the guy who has a pair of these hats to look at the thread, he's pretty sharp and helpful.

I never considered pad width. They do make 355mm rotors with smaller bolt circles and they do show as having 60mm "width". There's also an oddball 350mm rotor.

Vilheur, I can email the Brembo list if you'd like.

Vilhuer

Seems at least AP racing has something I can use. For some reason I didn't find them earlier. Unfortunatelly only 355x32 version which has enough large annulus is 210mm PCD and 10 hole setup.
http://www.apracing.com/drawings/CP3784-160~1CD.pdf
Plan is to use them with GTS stock big black calipers and 16mm spacers between caliper and hub. This is to counter larger rear calipers.

Rear calipers will be 993TT setup if they mount directly to stock hub holes, I think they do but haven't checked yet. Stock disk for them is 322x28 AFAIK. AP makes 320 and 325mm disks which look promising. That is if those calipers use 50mm high pads and not 60mm.
http://www.apracing.com/drawings/cp3047-406~7cd.pdf
http://www.apracing.com/drawings/cp3580-294~5G4CD.pdf

In any case I need to have hats for all four corners. Other options are obviously welcome. Mike, please send any info you have to erkka.vilhunen@iki.fi. Thanks.

There is also new option of using 997 GT3 calipers with 350mm disks. They have around 230-240mm long mounting lenght and it might be possible to make spacer which works with stock hub. At least it seems much easier than earlier 996 GT3 and GT2 calipers.

There are two 928 which use 996 versions in Finland. One is welded hub GT discussed in one previous thread in here. Another is non welded hub GTS which has very complex spacer setup including 3mm spacer for Keskin Speedline copy wheel to clear caliper etc. I want to avoid all that and use either stock front caliper, F50 Brembo or 997 GTS setup. In all these cases 355x32 disk should work. As I really do not need anything bigger than stock just updating to bigger disk is cheap option.

993TT rear calipers seemed easy solution if its mounting dimension are same as stock 928. If not, I will probably use 996 GT3 calipers as those have been done locally twice already and they are easy option from mounting point of view.

Jim M.

I installed 928 Motorsport SLC Big Red kit in my 93 GTS. Rears are from a 993TT. The rear calipers must have 6.12mm machined off the mounting surface to fit the stock width rotors; this is what the factory did on the Carrera RS and the Carrera Cup cars. So they can be installed with standard 993TT rear cross-drilled rotors. It bolts right up to the S4/GTS mount points.

justaguy

Here a couple of photos of 355mm stop tech rotors and custom hats by Mike Simard. Pictures show the difference between the S4 Pads and the big red pads.
I plan on running S4 calipers with these rotors using spaces between the spindles and calipers as Mark K and I have done with the 330mm rotors previously. Spacers will be thicker for the 355's Obviously.

justaguy

The spacers go between the Caliper and Spindle to move the calipers out raidially to accept the larger diameter Rotor. The calipers will require a little die grinding to fit down on the rotor, same as we had to do to fit the 330 mm rotors . Sorry for the confusion.
Sean

svp928

Erkka, the rotor you need for the Big Black (GTS) caliper is available from Coleman Racing- they are the ones Devek used in his brake kits. They have the larger friction surface and use a smaller hat than the 355 Brembo or Stoptech rotors. I was recently quoted about $130.00 ea from Coleman. Do you have hats for these?

Steve

Fogey1

You probably do. "Annulus. The region lying between two concentric circles."

blown 87

Taint, a word we all understand.

Vilhuer

Ok, thats at least third source for enough wide rotors and price sounds cheap.

Not yet unless pair friend has around happen to work. Though I can always have some custom made locally.

LostInSpace

Very interested in how this works out as I'm planning the same upgrade in the near future. I've got a pair of F50 calipers, but haven't worked out the disk and hat details yet.

For the hats, what (if anything) is required for the size and shape of the holes that the mounting hardware will use? I understand this can lead to vibrations, rattling or squealing if this interface with the disk is not correct or poorly designed?

Whilst the AP disc's are expensive, I believe they can also make a matching hat and supply correct mounting hardware.

Greg Grey also has a 355mm setup on his OB, hopefully he'll chime in soon and let us know what disks he's using...