FW: on prop valves

[jdbubb@ix.netcom.com (Dan Bubb)]

Well, I don't know shit about how these prop valves work, so no help
there.
But, I'd be willing to bet the bigger rear pistons are going to be an
issue.
~30% more area with the same pressure is going to be 30% more force,
should translate to 30% more braking torque! Doesn't sound good.
Dan

Andrew Stauffer wrote:
> 
> -----Original Message-----
> From: Andrew Stauffer
> Sent: Monday, March 25, 2002 9:05 AM
> To: 'Mk1gti@yahoogroups.com'
> Subject: on prop valves
> 
> Scott (and anyone else that has some info!),
> 
> I'm currently midway through the rocco 16v brake upgrade to my 83 GTI.  Rear
> discs, bigger fronts, and the mc/booster.
> 
> The question involves prop valves.  I've heard folks say that even with the
> 16v rocco prop valves, the rears still want to lock up prematurely.  Perhaps
> because the rabbit rear end(with no spare or back seat) is so much lighter.
> 
> At any rate, which prop valves did you use?
> 
> My situation is somewhat more complicated(heh, of course) as I'm not using
> rear calipers from a 16v rocco, I'm using the cast aluminum calipers from a
> 2001 Jetta.  The piston diameter is larger(41 vs 36mm IIRC) than the rocco
> rear calipers, which, I think, is going to further favor rear wheel lockup(
> I may be wrong on this last point, dunno).  So I was thinking about using
> *both* the Rabbit stock prop valve(the alum block) AND the 16v prop valves.
> 
> Good idea?  Bad idea?  Why?   Any other thoughts?  I should probably, at
> this point, be seriously considering an adjustable prop valve, but I don't
> have one of those in the garage, where as I have every other piece of the
> puzzle.  Thanks.
> 
> -----Original Message-----
> From: Scott F. Williams [mailto:sfwilliams@comcast.net]
> Sent: Sunday, March 24, 2002 9:38 AM
> To: Mk1gti@yahoogroups.com
> Subject: RE: [Mk1gti] Digest Number 1423
> 
> Steve Heller wrote:
> > i'm not so sure i want to do it after
> > reading how you're still dissatisfied with all the 16V upgrades.
> 
> Steve, don't get me wrong. I absolutely *love* the performance of my
> Scirocco 16v brakes. I've got the entire set up: master cylinder, booster,
> 10.1" rotors and big calipers, rear disks, etc. It works really great and
> I'd recommend it to anyone. The pedal is hard and the modulation is easy.
> However, I'm always looking for more! I picked up a Corrado G60 master
> cylinder for super cheap and don't mind experimenting with it. Furthermore,
> I am anticipating a move to some four pots sometime in the future.
> 
> Onward! In the name of SCIENCE! :^)
> --
> Scott F. Williams
> NJ Scirocco nut
> '99 Subaru Impreza 2.5 RS
> Mazda 323 GTX turbo "assaulted" vehicle
> Golf GTI 16v "rollycar"
> ClubVAC: "Roads found. Drivers wanted."
> 
> Check out our rally team's website!
> http://www.usrallyteam.com
> 
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