[urq] Power steering pump, compatibility

[Chris Miller]

My car doesn't have a power steering pump.  I'm putting in a 3b, and have a pump from a '91 coupe quattro 20v.  Specs on that pump:  servo side puts out up to 140 bar to brake servo system.  Vane portion of pump puts out up to 110 bar to the steering rack, reduced at higher engine rpm.

One person on Motorgeek has been running a later A6 pump that puts out 125 bar to the rack, and hasn't blown his 4000sq rack seals.  I think the stock 4000q pump puts out 75 bar, and I'd assume the urq has the same or similar rack.  My understanding of the rack system is that there is no overpressure relief, so holding the rack at full lock is when seals typically are stressed the most.

Any thoughts?  I could also just install the rack from the '91 cq as well, but that rack has 220k miles on it, while the urq rack has just under 40k miles.

Brakes.

I will also be installing the clutch master from the '91, and suppose I could install the entire master/booster/bomb setup for the brakes as well.  Is the brake bomb for the standard urq system available aftermarket?

 

 

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Chris Miller, Brewster and Bolton, MA  c1j1miller at aol.com