[s-cars] BB Upgrade - rotor question

[Sean Douglas]

Tony:

Hmm, seems weird. The 993tt is designed to accept a 32 mm thick rotor. The
A8 Audi rotor is indeed 30 mm thick  - I just ran out to the garage and
double checked on an extra set I have.

Are you sure yours are from the twin turbo 993?

BTW, since the Audi rotor is 2 mm less thick than the Porsche rotors, it is
not perfectly centered and is offset by 1 mm. It doesn't really affect
things too much, but you will notice that the pads will not wear evenly.

Most people don't bother, but you can machine 1 mm off the bracket to centre
the caliper over the rotor. Or if you run 993tt 32 mm rotors rings with a
custom hat, then you don't need to do anything (which is what I'm running).

Sean

> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Tony Curran
> Sent: December 7, 2008 7:51 AM
> To: S-Car-List at Audifans.Com
> Subject: [s-cars] BB Upgrade - rotor question
> 
> 
> Hi folks, I'm accumulating the parts for a spring upgrade to 
> Big Blacks.
> Just received a used pair of 993 calipers and was doing a bit 
> of cleaning when it occurred to me the space for the rotor 
> didn't quite appear to be 30mm wide - measures just a tad over 28mm.
>  
> So, when the dimension of the A8 rotor 4D0 615 301 J is 
> spec'd as 323x30, just exactly what is the 30?
>  
> I'm planning on using plain A8 rotors (no slots or holes & 
> $95) any thoughts on pros/cons? (I don't plan to track car).
>  
> Thanks
>  
> Tony
> 96 S6
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