View Single Post
spuggy spuggy is offline
Registered User
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 3,409
Disconnected the plug (greenish) behind the air-filter.
Just to run the pumps without jumpering the relay?

Originally Posted by Benny771 View Post
Valve closed 6.5 bar?
I don't have a manual for an 89. However, spec for system pressure for a 1978-81 930 is

6.0-6.7 bar, "adjust value" 6.2-6.5 bar.

I've always been a little foggy as to the meaning of "adjust value" - I always figured that would be the values that you would adjust it to..

Either way, 6.5 bar would be in spec - for my car...

Valve open 3.7 bar?
Warm control pressure spec is 3.65 bar +/- 0.2 bar for a 78-81.

Its 24 degrees out
The graph says the CCP (which is what you're measuring if the bi-thermal strip in the WUR is disconnected) for my car should be between somewhere around 1.9-2.3 bar for that temp.

But if you've been supplying power to the bi-mettalic strip in the WUR for any length of time, then you might be measuring WCP.

Or something in-between. Depending on how long the WUR was powered for.

Conventional wisdom says you only get one shot at the CCP per day - soon as you apply power or start it, you're done for the day.

Pumps off, valve open,lowers from 3.7 to 2.2 over 30 sec
Over 4 mins at 1.6 bar
For the cars I have manuals for, you need "after 10 minutes: 1.6 bar at least" and "after 20 minutes: 1.4 bar at least".

I have never messed with the WUR,why the change ?
Darned if I know - what change?
'77 S with '78 930 power and a few other things.
Old 07-06-2011, 10:28 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)