Need control pressure spec for 77 3.0 carrera row and proper WUR number
 

I have a 77 euro 3.0 carrera What is the correct WUR # and what are the proper warm and cold control pressures? Thanks much.

WUR 0438.140.017

Cold 1.2 bar warm 3.1 bar

the wur that's installed is a 140 033

Wur-033......
 

Both WUR-017 and WUR-033 should work for your '77 Carrera (Euro) provided the specifications are all correctly set-up. What problems are you having with your fuel pressures? Keep us posted. PM sent.

Tony

Thanks Tony. I have a problem with the warm pressure it's 3.8 bar. Spec calls for 2.7-3.0 bar. Cold seems normal @ .5 bar. System pressure @ 5.0 bar.

Wur-033......
 

kodioneil,

The cold control fuel pressure is too low!!!!! And that's not NORMAL. Your WCP is still within specification but on the high side. You are mis-reading the WCP spec values:
(2.7 - 3.1 bar)........no vacuum
(3.4 - 3.8 bar)........with vacuum

Keep us posted.

Tony

What is the cold pressure spec? this is a euro 3.0 car.

Mike
do you have the spec book?
per mine
control pressure(wur off) at idle, throttle closed 3.6+/-.15bar
engine stopped, fuel pump running 2.9+/.15

system pressure 4.5-5.2bar

you can make it adjustable easily enough, I have instructions if you need them

I used to just tap mine to where I wanted it. You had to disassemble it if you went too far though(a potential PIA)

thanks Bill what's the cold spec? Don't have a book for euro spec.

http://forums.pelicanparts.com/uploads15/EarlyWURs1248319527.jpg

does this graph for the 033 wur indicate .5 bar@10c and 2.7bar warm?

This is from the '76-77 spec book
http://forums.pelicanparts.com/uploa...1392071709.jpg

The graph Bill posted is for cold control pressure. It is a function of ambient temperature so as it gets warmer the cold control pressure increases (leans).

Warm pressure is a range, period. Not on a graph.

Thanks Bob

I can pull several threads where I assumed that the CCP graph was for both. It's confusing at first blush but makes sense when you think about it.

Different reference graphs.........
 

Mike,

There is a discrepancies in our reference graphs. I am using the factory shop manual from Porsche which shows a completely different slope for WUR-033 from yours. I've been using the graphs from my factory shop manual for almost 20 years and never had problem with the setting. So I'm sticking to my reference charts and let you decide which to use. Good luck.

BTW, 0.5 bar cold control pressure setting is too low based from actual tests and my experience working with all sort of Bosch WUR's 0-438-140-xxx. But if you are happy with this setting and it works for you, just keep it that way.

Tony

Cold control fuel pressures.........
 

This is also true for CCP.

Tony

Thanks Tony and Bob. I'll try the high end of the ccp @ 10c.

Hello,

Has this ever been solved? I mean the discrepancies in our reference graphs for the WUR-033.
In the workshop manual of Porsche it shows a different graph compared to the graph in the Types, Dimensions, Tolerances softback book (always from Porsche) or compared to the graph in some Bosch workshop manuals?
My WUR-033 is set to the TDT (or Bosch documentation) and I'm wondering if I should rebuild it to the graph in the workshop manual?

Thanks,
Peter

I suppose that the different WUR pressure specs are not that cruicial in any case for a 911. Of course they should be clarified if there are wrong specs given. I suppose you're asking while you got some issues on your 911. I recommend to start a new thread or search for symptoms similar to your car here in the forum.

Thomas