Re: ur-q vacuum brake conversion

[Robert W Obrien <rwo@u.arizona.edu>]

On Fri, 21 Nov 1997, David G. Lawson wrote:

> Martin,
> 
> >I use the intake vacuum to operate the brakes.  The only problem is 
> the lack of power brakes under left foot braking otherwise it just as 
> good as with a N/A engine.  You might want to use a cylinder head out 
> of a car with a vacuum pump but you would have to change the valves 
> to sodium cooled.  I know someone who has done this to get rid of the 
> hydraulic system on their Ur-q.
> <
> 
> Thanks for detailing your install. I was wondering about this. The 
> porsche 951 is a turbo and it uses a vacuum booster for the brake
> system so there is nothing stopping me from using it on an ur-q.
> I think of my wrecked GT, the vacuum brake setup and the head with
> the vacuum pump just sitting there. I see another project developing.
> Ditching the ur-q hydraulic brake setup including the bomb and
> hyd booster and base unit and numerous hyd lines seems like a
> step in the right direction. And I have the core for my big valve hyd
> head sitting right there, including the vacuum pump. And those schrick
> cams are designed for the NA cars, so they have the vacuum pump
> cam designed into the camshaft, right folks? Oh, this might just be
> too good to pass up.
> -
> Dave Lawson
> 
I was wondering about this- I have heard that vac brake assist doesn't
work with turbos- but every turbo I've ever driven aside from Audis had
vac assist. I, too, would enjoy the Audi experience quite more if the
"green gold" were gone. I'll be curious to see how this brainstorm comes
out.
Regards,
Rob