[urq] 20VT 3B Power Steering

[Mike Sylvester]

It is.  That is what Scott said in his last paragraph.

BTW, I've also converted to the vacuum brakes and have had no issues
with brake assist.

Mike

> -------- Original Message --------
> Subject: Re: [urq] 20VT 3B Power Steering
> From: Gmail <s.b.mills at gmail.com>
> Date: Tue, June 19, 2012 11:36 pm
> To: Scott Justusson <qshipq at aol.com>
> Cc: "urq at audifans.com" <urq at audifans.com>
> 
> 
> Scott-
> 
> The 4k vacuum setup sounds like a good mod, but C4 S cars all use accumulators for brake and steering assist- how is that not perpetuating the UrQ setup?
> 
> 
> 
> On Jun 19, 2012, at 10:28 PM, Scott Justusson <qshipq at aol.com> wrote:
> 
> > 
> > Hmmm...  Several years ago, I looked at putting one of these cruise control pumps on my vacuum diffs for my 83 urq to help with high altitude ck valve freezing+sustained boost of the Steamboat Ice track conditions at 7200ft.  In Chicago I measured a whopping 17inHg (altitude 660ft) as max for the 3 CC pumps I tested.  In addition, they took quite a while to fill a couple vacuum resevoirs of less than 1qt total.  At 660ft a 20vt engine can generate about 15inHg at idle, and just under 30inHg under compression braking, so I went the route 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 chassis 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 the CC unit will likely run continuous duty and still come up short without a couple extra reservoirs in the system.  Again, if 'reserve capacity' is a concern, just add the reservoirs and an additional large ck valve downstream of the IM.  On my 4ktq, I use 3/8 line to feed from the back of the 3B intake manifold to the stock 4kq booster ck valve.  I run the stock 4k master with G60 fronts A4 Rears.
> > 
> > The best thing about the vacuum setup in the turbo cars, is deleting that primitive bomb arrangement Audi delivered on the urq from the factory.  You don't see that hydraulic setup on Audi turbo cars after the urs cars....  For good reason IMO.
> > 
> > Cheers and my .02
> > 
> > Scott J
> > 2 x 20vt with vacuum assist
> > 
>