[s-cars] Re: Big Red Rear Brakes

Mon Oct 20 11:05:17 EDT 2003

Leigh,

Yes they are. I know the suspension upgrade had an positive impact. The rear
used to dance a bit on the track under hard braking. It doesn't anymore.
To give you a comparison. At Charade Race Track, a stock RS4 can do 5-6 laps
maximun. I did 14 before loosing brakes. I am considering installing the
brakes ducts of the RS2 on my car for our next track event

I don't know the weight distribution between Avant and Sedan so I can't
tell. If you have the ratios I will be interested.

Frederic

>From: "Leigh Anderson" <leigha at teleport.com>
>To: "Frederic L'Huillier" <flhuilli at hotmail.com>,<s-car-list at audifans.com>
>Subject: Re: Big Red Rear Brakes
>Date: Tue, 21 Oct 2003 00:59:16 -0700
>
>Hi Fred,
>
>Are the rear BRs on your beautiful blue V8 S6 avant?  i wonder if
>later/more
>advanced ESP and more advanced ABS as well as larger contact patch (265m!)
>have something to do with your better results (vs. early '90's UrS?). Also
>i
>think the Avant has better weight distribution so the rears would have more
>grip at the contact patch.
>
>yep,YMMV!
>
>Leigh
>----- Original Message -----
>From: "Frederic L'Huillier" <flhuilli at hotmail.com>
>To: <leigha at teleport.com>; <s-car-list at audifans.com>
>Sent: Sunday, October 19, 2003 11:47 PM
>Subject: Re: [s-cars] Re: Big Red Rear Brakes
>
>
> > Hi,
> >
> > As I have the BR on 4 wheels on my car, I will drop a few words on this
> > topic:
> >
> > Yes it does make a difference in term of performance. To a point where a
> > Lotus Elise on track was pretty close to damage my rear bumper ! Jim
>Klein
> > from California drove my car a few weeks ago and he confirmed it is much
> > better than just the front BR.
> >
> > I believe Movit HQ did only one car: Mine. Actually it used to be on
>their
> > web site under the S4 section. It is not there anymore. The previous
>owner
> > told me that Movit had to do a lot of work to make the rear BR work
> > properly. A lot of parts had to be made for the rear BR. Because the
> > previous owner owned a couple of sport car magazines, Movit did it. It
>would
> > have been you or me, they would not have done it ! I have checked
>recently
> > for other French Audi Club member and received a huge No More !
> > I am waiting the estimation of the value of those BRs for my insurance.
>The
> > bill is at least 10000 dollars.
> >
> > You need a sport suspension to keep up with such brakes system. I had my
> > Bilstein rebuilt to a much harder setup. In term of tires, I do have
>265/35
> > x 18.
> >
> > My 0,002 old Francs
> >
> > Regards,
> > Frederic
> >
> >
> > >From: "Leigh Anderson" <leigha at teleport.com>
> > >To: <s-car-list at audifans.com>
> > >Subject: [s-cars] Re: Big Red Rear Brakes
> > >Date: Mon, 20 Oct 2003 10:06:04 -0700
> > >
> > >Hi Todd,
> > >
> > >I have a few thoughts, btdt for putting big brakes on back of an
>UrS6...
> > >I'm skeptical of the performance benefits for such a front-heavy car as
> > >ours, but if motivation is 'cause they look great... thats cool, go for
>it,
> > >being a big brake fanatic myself.  But I just couldn't justify the
>expense
> > >for myself for functional reasons.
> > >
> > >btdt/background: For hard braking anywhere/track use especially, i
>predict
> > >the best setup will be to use a brake bias control and defeat almost
>all
>of
> > >the BR rear brake's capability. my BTDT is an UrS4 track car with
>mov'it
> > >BR's up front (works great and much better than smaller P-car (968)
>brakes
> > >that PO put on), and P-car brakes on rear (968) installed by PO,
>smaller
> > >than the 993tt rears, but much bigger than stock UrS rears. When i
>tried
>a
> > >few laps set even 1/3 to rear, it was truly scary/dangerous, the car
>was
> > >skittering/jittering all over, very un-nerving, with lots of
>quick-steering
> > >inputs to keep it semi-straight and ABS helping as much as it could but
>not
> > >nearly enuf. As soon as i slapped the control back to full-front, the
>car
> > >was rock-solid, much more usable/powerful straight-line braking
>resulted.
> > >I
> > >experimented a few more laps doing a-b testing and came to a firm
> > >conclusion, at least for that car.
> > >
> > >Also note the usual pad life (long) of rear pads vs. front pads under
> > >street
> > >or track condition. My R4S street compound pad lasts a long long time
>at
> > >rear thru street and track use.
> > >
> > >so my 2cents is... if function is the goal, consider not to do it, save
> > >money for a more functional perf upgrade.  If aesthetics is the goal,
>go
> > >for
> > >it, but most likely expect to be defeating the rears with a
> > >brake-positioning valve for safety reasons.
> > >
> > >pardon if my 2 cents is obvious, as the reference in Todd's post
>already
> > >says "Some strong words of advice: *-Altering the brake system on your
>car
> > >may be dangerous, and the front/rear brake ratio should be checked
>after
> > >modifications. A wrong setup results in locking the rear wheels prior
>of
> > >the
> > >front wheels which is dangerous. I strongly recommend the installation
>of
> > >an
> > >adjustable proportional valve instead of the original one, or at least
> > >check
> > >the front/rear ratio with the stock valve."
> > >
> > >Cheers,
> > >Leigh
> > >street car: '92 UrS4 with...
> > >    Front: Mov'It BR's, Porterfield R4 pad for track, Porsche street
>pad
> > >(R1
> > >slicks for track)
> > >    Rear:Audi stock caliper rear, R4S pad for track or street, 2Bennett
> > >drilled rotor (R1 slicks for track)
> > >
> > >P.S.  note the benefits of <clipped> posting.  I see too many unclipped
> > >posts, one reason i participate less than in past years... it gets
>tiresome
> > >'wearing out my scroll button' going through digest emails looking for
> > >msg#n
> > >
> > >----- Original Message ----- >
> > >Message: 1
> > > > From: "TODD KRAMER" <toddekramer at msn.com>
> > > > To: <CaptMagu at aol.com>
> > > > Cc: "s-car-list" <s-car-list at audifans.com>
> > > > Date: Sat, 18 Oct 2003 21:04:40 -0600
> > > > Subject: [s-cars] Big Red Rear Brakes
> > >
> > > > Hap,
> > > >
> > > > Send me the pic/pics.  I too am so close to a big red rear brake
> > >solution
> > >t=
> > > > hat it isn't funny ... I am simply an emergency brake cable away
>from
> > >using=
> > > >  the actual RS2 setup with the internal Porsche drums.  The master
> > >cylinder=
> > > >  capacity is my only concern, but my techs in Germany assure me that
>the
> > >Ur=
> > > > S MC is up to the task.
> > > >
> > > > My biggest hurdle was the centering disk to keep the 993TT rear
>rotor
> > >prope=
> > > > rly centered, but my OZ Futura's have an integrated removable spacer
> > >that
> > >w=
> > > > ill soon be cut to handle the task.
> > > >
> > > > This old link
> > >http://www.s-cars.org/urs4s6/faq/f008/RS2_e-brake/rs2_e-brake=
> > > > _4.html has been the inspiration, but I think Joern was using a true
>Big
> > >Re=
> > > > d front caliper in his mod.
> > > >
> > > > .=2E.and now that I hear the Lincoln LS uses and electronic acutator
>on
> > >the=
> > > > ir e-brake, the cables may no longer be the long pole in this tent.
> > > >
> > > > Todd Kramer
> > > > '95 S6
> > >
> > >
> > >
> > >_______________________________________________
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> > >S-CAR-List at audifans.com
> > >http://www.audifans.com/mailman/listinfo/s-car-list
> >
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>
>

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