[urq] [s-cars] S-Car Brake system conversion- Read- no more PSpumpintegration <question>

[brian bilotti]

Guys,
 
Thanks for all your input. My mechanic is just about to do a 20vt conversion on an Urq and his plan was to do this conversion and use BIG brakes because this will be a track whore.
 
His thought was to have an additional vac reservoir for track days because of that very reason Dennis.
 
Ingo, you might have something there, Vac assist helper?hmmm.
 
I'm so sick of the idiot brake light and hard pedal, I just want it ffixed. My dilemna is strap a rebuilt POS PS pump on or go this route with some unknowns. 
 
My thought was, since I won't be tracking it in the next 3 months, get it working ala Dennis' and work on the vac assist issue later.
 
Anymore thoughts would be great.
 
Thanks
Brian
925-989-8997 PST
 
Leal and Trevor, you can chime in anytime ;-)  

--- On Sun, 3/15/09, Ingo Rautenberg <ingo.rautenberg at gmail.com> wrote:

From: Ingo Rautenberg <ingo.rautenberg at gmail.com>
Subject: Re: [urq] [s-cars] S-Car Brake system conversion- Read- no more PSpumpintegration <question>
To: dgraber460 at aol.com, urq-bounces at audifans.com, cody at 5000tq.com, vinnieb2 at yahoo.com, s-car-list at audifans.com
Cc: urq at audifans.com
Date: Sunday, March 15, 2009, 7:33 AM

Interesting but not surprising. I wonder if something could be done on the order
of the old 4kq assist pump (maybe additional electric-driven vacuum pump). The
4kq system, for those that recall, had a vacuum assist pump driven by the
camshaft. Not doable directly, of course. But that's essentially what you
need -- a vacuum assist helper. 


Ingo Rautenberg

-----Original Message-----
From: dgraber460 at aol.com

Date: Sun, 15 Mar 2009 10:18:14 
To: <cody at 5000tq.com>; <vinnieb2 at yahoo.com>;
<s-car-list at audifans.com>
Cc: <urq at audifans.com>
Subject: Re: [urq] [s-cars] S-Car Brake system conversion- Read- no more PS
 pumpintegration <question>


I have an UR S6 with brake issues as well, so I can empathize with those
feelings! My car is briefly activating the anti-locks on every stop as the
speedo crosses 10 MPH on decel.
In the FWIW department, I have switched my URQ over to the vacuum system from a
CGT, and it works fine for daily driver duty. However, I have tracked the car
twice since and found that 4 laps on a small tight course is all I get from the
vacuum system. In the? fifth lap on both courses the brakes went rock
hard.?Still functional enough to keep me out of trouble, but the assist was
gone. Pulled into the pits and let it set for a few minutes and all went back to
normal. Four more laps and repeat.
In the past when I have tracked a car with regular brake fluid (not SuprBlue) I
have encountered boiling brake fluid which required a much longer recovery time,
and felt much more disconcerting on use. The brakes would almost go away
completely.
I'm definitely not suggesting you take either option and modify your brakes
in any way. That is totally your responsibility, but thought this information
might be of interest.?


Dennis Graber
Denver, CO
720-838-0558


-----Original Message-----
From: John Cody Forbes <cody at 5000tq.com>
To: vinnieb2 at yahoo.com; s-car-list at audifans.com
Sent: Sat, 14 Mar 2009 9:54 pm
Subject: Re: [s-cars] S-Car Brake system conversion- Read- no more PS
pumpintegration <question>



Without GOOD engineering a vacuum assisted system is not exactly a good idea 
on a turbocharged car which is exactly why Audi went to hydraulic brake 
boosters anyways. The '95 A6 system would likely not be suitable. It could

likely be made to work, but I don't think it's worth the risk of a
failure 
at the wrong time. The modern cars use a venturi vacuum pump to create 
vacuum for the brakes even when on boost, but these venturi's fail (get 
clogged) on a somewhat regular basis.

-Cody Forbes

brian bilotti wrote:
> S-Heads,
>
> Anybody done this conversion? I'm sick of having brake issues with
> the PS pump. My mechanic says that the A6 has a vac assisted set up
> that eliminates the need for PS pump integration.
>
> The need for some off the shelf parts and a check valve is all I
> need.... I'm told.
>
> ANY info would be great!
>
> Thanks
>
> Brian
>
>
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
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