I own the RS2 since 1997scillyisles wrote:There are several reasons that a two-piece floating disc assembly is of benefit. First, by using an aluminum bell for the hub section of the disc it saves a great deal of weight. Since this is both rotating and unsprung, it benefits the acceleration, braking, and handling of the vehicle. Secondly, it is better able to handle the large temperature changes that a brake disc experiences. During severe use, temperature variances become present in a one-piece disc and generally cause warping of the disc. This not only results in vibration of the vehicle, and pulsing of the brake pedal, but also pushes the pistons farther away from the disc. In a two-piece floating disc assembly, the iron disc heats up more uniformly, and the controlled float which is present allows for the differential expansion of the very hot brake disc, and the relatively cool aluminum bell. This allows the disc to be used under severe conditions without having a detrimental effect.nilshenr wrote:The document states this partnumbers are for a one piece disc, why do you want floating discs..? I run 045.00 and 046.00 on my car, and it fits nice! This are priced quite reasonably from Porsche, and I would guess the original floating discs from Audi is a _little_ more expensive..scillyisles wrote: Porsche partnumbers 965-351-045-00 and 965-351-046-00 should be the front discs - wrong the OEM upgrade kit gives you floating discs whereas these Porsche discs are fixed not floating.
I also have 951-352-041-02 on my car, it's the version without holes.. this also fits. Maybe there is a mistake about the 041.91 version, 041.02 is ok atleast..
The list was created by Joern Amundsen, with some cooperation from me.. and we have tested most of the partnumbers I think...
The Audi upgraded brakes for the RS2 consist of a fixed caliper (produced by Brembo) that is secured rigidly to the axle assembly and has opposing pistons that force the pads against the disc. Fixed discs are designed to operate best with a sliding or floating caliper which has pistons on only one side of the disc. Therefore, when the caliper acts, it must slide or float in order to bring the pad on the opposite side in contact with the disc. Nearly all original equipment calipers are of the floating type. In the upgraded Audi brake system with fixed calipers, not only is the mounting much more rigid, but the stiffness of the caliper itself is greatly increased. This manifests itself in enhanced braking performance, pedal feel, and pad wear.
I went in 2006 to big reds with the 322mm discs.
I used twice the discs from the 964 turbo (965-351-045-00 and 965-351-046-00) the ones you say they're no good....
I can understand all you said about the floating disc, that they're better and this and that..
But those discs were not used on a slow car IMHO..... that caliper it's exactly the same as the one used on the RS2 upgrade...
I never encounter any problem at all with those discs and they've been fitted in my car twice so far.
Also consider that the original equipment the 304 mm discs are NOT floating... but solid, are those wrong designed by Brembo also? They use the same caliper design with the same bracket are them?
Assuming this even the calipers and discs from the 964 turbo are bad designed by Brembo?
To go with bigreds even with solid discs it's to me defenetely an upgrade period
So at the end of the day if we want to be purist then, we can say that the floating discs are more "original" and perhaps more performing but to say that the part it's wrong it's a very long shot.
Stefano
P.S.
The bell of the original RS"2 322mm discs are made in castiron and not alluminiun, also if I have a bell made with a ligther material i rather go with hergal..... then "alluminium".