[urq] 20VT 3B Power Steering..............UrQ WX brakes/power steering

Tue Jun 19 21:35:27 PDT 2012

So while we're on the topic of vacuum brake set ups in the UrQ I have a few questions that I hope the group can answer.  I have an UrQ and it's basically 100% original.  I also have most of the vacuum brake setup from a CGT which includes the vacuum brake booster, the PS pumpm, and the steering rack.   I've heard several versions of what I can/should do.  I'm not 100% what to eliminate on my UrQ in regards to all the hoses and what not. I've heard that I can just eliminate some hoses and use the original pump.  I've also heard that I need to use the CGT pump and it would be just fine.  Also.....I've heard that I should use the CGT pump but must change a spring or something inside or else it will blow the seals in the UrQ rack.  Also.....I've heard that I need to swap to the CGT pump AND steering rack.  Installing the vacuum booster isn't a problem for me, but the PS pump stuff is confusing.  Can anyone that's BTDT help a guy out?  My bomb is pretty much shot so you can imagine how much fun that is.  I have no intention in fixing the hydraulic assist system and am anxious to just put the vacuum system in so I may have fully operational brakes again.

Thanks in advance,

Chris Knapp
Columbus, OH

-----Original Message-----
From: Scott Justusson <qshipq at aol.com>
To: laraa <laraa at sympatico.ca>; p.carlier <p.carlier at pandora.be>; guards4s <guards4s at gmail.com>; urq <urq at audifans.com>
Sent: Tue, Jun 19, 2012 10:29 pm
Subject: Re: [urq] 20VT 3B Power Steering

Hmmm...  Several years ago, I looked at putting one of these cruise control 
umps on my vacuum diffs for my 83 urq to help with high altitude ck valve 
reezing+sustained boost of the Steamboat Ice track conditions at 7200ft.  In 
hicago I measured a whopping 17inHg (altitude 660ft) as max for the 3 CC pumps 
 tested.  In addition, they took quite a while to fill a couple vacuum 
esevoirs of less than 1qt total.  At 660ft a 20vt engine can generate about 
5inHg at idle, and just under 30inHg under compression braking, so I went the 
oute of larger and better ck valves and more resevoir capacity.
If you look at the cam driven vacuum pump on a 10v N/A car from Audi (mid 80's B 
hassis cars), you can see that the fitting ID is something around 3/8in so the 
refill' time to normal vacuum is almost instantaneous.  That bitty line from 
he CC unit will likely run continuous duty and still come up short without a 
ouple extra reservoirs in the system.  Again, if 'reserve capacity' is a 
oncern, just add the reservoirs and an additional large ck valve downstream of 
he IM.  On my 4ktq, I use 3/8 line to feed from the back of the 3B intake 
anifold to the stock 4kq booster ck valve.  I run the stock 4k master with G60 
ronts A4 Rears.
The best thing about the vacuum setup in the turbo cars, is deleting that 
rimitive bomb arrangement Audi delivered on the urq from the factory.  You 
on't see that hydraulic setup on Audi turbo cars after the urs cars....  For 
ood reason IMO.
Cheers and my .02
Scott J
 x 20vt with vacuum assist

-----Original Message-----
rom: Louis-Alain Richard <laraa at sympatico.ca>
o: 'Patrick Carlier' <p.carlier at pandora.be>; 'Jee Yoo' <guards4s at gmail.com>; 
rq <urq at audifans.com>
ent: Tue, Jun 19, 2012 4:42 pm
ubject: Re: [urq] 20VT 3B Power Steering

asier than this, Renault diesels from the beginning of the 2000's have a pump 
hat we all know too well. 
It's exactly the same Bosch unit that powers the cruise control on turbo cars... 
older or newer. 
Standalone 12V unit, with a check valve and rubber mounting for quietness of 
peration.
4B0 907 325: http://www.ebay.com/itm/1999-VW-PASSAT-CRUISE-CONTROL-VACUUM-PUMP-4B0907325-/160700434278#ht_2174wt_1163
I guess these are a dime a dozen in a scrapyard.
Louis-Alain

-----Message d'origine-----
f you do insist on having a vacuum assisted brake, then get one of those vacuum 
pumps from a diesel engine to power it. Some
iesels, Ford Transit fyi, have a vacuum pump on the alternator. Easy and 
ffective.
Pat

______________________________________________
udifans urq mailing list
anage your list connection: http://www.audifans.com/mailman/listinfo/urq
ttp://www.audifans.com/kb/List_information
Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/