[s-cars] Anyone ever use 944 Turbo calipers on an S6?

[joeamund]

Linus!
I'we measured both and the RS2 original front rotor is 304x32 and the rotor
for upgraded brakes are 322x32.

Apart from the  diametrical difference there are other  diffencences: 304mm
rotor has a 50mm wide pad area(ie 304mm OD - 204mm ID) and the  322mm  rotor
has a 60mm wide pad area.(322mm OD - 202mm ID). This makes up for the sligtly
larger 993tt caliper for the 322mm compared to the 968CS used on the  original
304mm rotor. The offset is the  same on  both  rotors.

Both systems use as you say the same bracket(8A0 615 125A) and the other(apart
from caliper beeing slightly taller) difference is the pad-retainer which
place the  pad in the center of the pistons which on both systems are 44/36mm.
The length of the pads are identical, meaning you can install a large pad(W =
60mm) in the smaller caliper with the proper pad-retainer, but you would end
up with a mismatch on  correct caliper position to the rotor pad area.

Both  calipers can accept 36mm thick rotors and I saw they glued different
"backplates" with different thickness on the pads at MOVIT, in order to have
the pistons fully retracted for every different thickness. This is a safety
precaution we all should consider when upgrading our brakes!

Best Regards Joern,MTM RS




>===== Original Message From Linus Toy <linust at mindspring.com> =====
>--
>[ Picked text/plain from multipart/alternative ]
>At 10:06 PM 11/15/2002 , Richard Tanimura wrote:
>>I believe the standard rotors for the Porsche S4 calipers were 304 x 32
>>which are the rotors from the 3.3 l turbo. I thought it was this size that
>>was used on the RS2. Could be wrong since I have never measured the RS2
>>rotors.
>
>The FA shows the RS2 original rotor as 304x32.  Further review of the FA
>shows two different calipers--one about 5mm taller than the other (based on
>the bolt fixing the caliper to the same bracket).  5mm taller implies a
>10mm greater diameter, though this doesn't account for actual location
>radially vis-a-vis the rotor.
>
>Coincidentally, the normally aspirated 993 stock rotor size is
>304x30...hmmm...the NA 993 uses a caliper that sits 5mm lower than the
>993tt's BR caliper (again, based on differences in bolt length used to fix
>caliper to strut).  It is a simple (but $$$) bolt-on conversion to put
>993tt BR calipers on a NA 993.
>
>>Getting back to the 951 calipers, I think they would make a nice moderate
>>upgrade. I don't track my car and the 951 calipers are a nice trade off.
>>Smaller, lighter calipers than the S4, less rotating mass in the rotors 298
>>x 30, less unsprung mass. Not as good as the Porsche S4 but better than the
>>G60 and they fit my 16"s. As noted, the RS2 adapters would fit the mounting
>>holes of both the Porshce S4 and the 951 calipers, but since the 951 takes a
>>slightly thinner rotor, the problem might be offset in the axial direction.
>
>According to some posts, using the RS2 bracket with 993tt calipers over
>A8L/urS8 rotors leaves the caliper about 0.5mm off-center--nothing
>critical--I'll find out first-hand very soon :)  Remember that the A8L
>rotor is only 30mm vs. the 993tt rotor at 32mm.
>
>>-----Original Message-----
>>From: s-car-list-admin at audifans.com
>>On Behalf Of t44tq at mindspring.com
>>Sent: den 16 november 2002 03:50
>>To: S4audinut at aol.com; WeSki at icubed.com; s-car-list at audifans.com
>>Subject: RE: [s-cars] Anyone ever use 944 Turbo calipers on an S6?
>>
>>I don't know- the RS2 used both 314x30 and 322x32 rotors, right,
>>depending on the option? I don't know if the placement would put the
>>caliper in the right place even if the bolt spacing was the same.
>>Taka
>
>Interestingly, 314x30 IS a common (?) Audi rotor size, as used on the Euro
>S6 and A8, just a different bolt-circle from the RS2.
>
>--Linus
>
>
>*--------------------------------------------------------------------*
>*  Linus Toy                      Insanity is doing the same thing   *
>*  Mercer Island, WA              you've always done and expecting   *
>*  linust at mindspring.com          different results                  *
>*                                      - Roger Milliken              *
>*--------------------------------------------------------------------*
>--
>
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