[s-cars] Rotor hats and rings

[Eric Phillips]

On 4/11/06, Igor Kessel <KBATPO at comcast.net> wrote:
> Eric Phillips wrote:
>
>  > The other issue is that
> > folks have is that the rotor is not perfectly centered in the caliper,
> > and that the RS2 bracket needs to be modified as a result.  (I dunno
> > why thin washers in the right place wouldn't work, but what the hell
> > do I know?)
>
> Actually it's the other way round, Eric. You need to shave 1mm off the
> RS2 bracket in order to center the rotor.

See?  What the hell do I know?  ;)

> I understand that this is also not a problem, because the
> > pistons will adjust as necessary for small non-centering issues.
>
> The pistons will, but not the carrier bracket.

I understand that part.

> > Considering the price difference between the two set-ups ($250 for A8
> > rotors, vs. ~$800 for Porsche/custom hat), one could put up with a
> > little bit of slop here and there.
>
> But not the weight of these boat anchors. It's atrocious.

That's what I mean about thermal mass.  For street applications,
thermal mass is *good*.  For repeated hard braking, not so much.

Now, what's NOT good is unsprung mass and its effect on handling. 
Again, this is more of a track issue than a street issue.  If I were
running at the track, I would pop for the extra$ ring+hat, no
question.  But my car isn't going on the track, so the Hugh Jass
rotors and their weight is not of consequence to me.

> That and their propensity to warpage if overheated. I must have shaved
> my right one 2 or 3 times already. Granted, it was a bad casting (see my
> lengthy bitching ca. 2002 in the archives) but still...

Regular street use would probably not overheat them.  Even spirited street use.

Maybe after I wear out these rotors, I'll go to the ring+hat system. 
Depends on what kind of performance/life I get out of this set-up.

--
Eric

1995 UrS6 "Silber Geist"