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dpw928
Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055
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Posted: Fri Oct 07, 2011 2:09 am Post subject: |
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The 30 circuit is direct to the battery and the 87 is direct to the fuel pump, so connecting them will start the pump. The WUR heater works off the 15 (ignition on) circuit, so jumping the 30 and 87 will not heat the WUR. The control pressure can be tested without heating the WUR. If the engine is cold, just use the ambient temp to compare your test results. You test the heater by taking an ohm reading between the two connects and testing each connect for a fault to ground.
The haynes manual was probably referring to the pump running for a few seconds when the key is turned to on and the relay installed. This primes the fuel system.
Dennis _________________ 81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
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TheBib
Joined: 21 Aug 2011 Posts: 50 Location: Michigan
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Posted: Fri Oct 07, 2011 3:42 am Post subject: |
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Understand about testing the heater, but there in lies an assumption that if the hearter works the warm control pressure will be on spec.
SO my question is if i do in fact wish to test the warm control pressure how do i accomplish this.
also Idola you mention about pulling the injectors. I know all of mine are fine, do i really need to pull them. Since the fuel pressure tests are performed with the engine off, the air sensor plate and arm should be down and therefore no fuel being injected into the intake. And i know none of mine leak when the sensor plate is at rest. _________________ TheBib |
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dpw928
Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055
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Posted: Fri Oct 07, 2011 4:16 am Post subject: |
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Yes, if the cold control pressure is correct and the heating element is working correctly, the warm control pressure should be within spec also. If you want to test it warm, run the engine, measure the temp of the body of the WUR and compare the control pressure to the chart at that temp.
You would only want to pull the injectors if the system failed the leakdown test.
Dennis _________________ 81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
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TheBib
Joined: 21 Aug 2011 Posts: 50 Location: Michigan
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Posted: Fri Oct 07, 2011 4:24 am Post subject: |
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Another question Ideola, when you mention connection of the lines, I understand the press guage test line without the valve goes to the fuel distributor.
However is the pressure guage test line with the valve connected to the very line that you removed from the fuel distributor? (in other words all i am doing is putting the test appratus inbetween the fuel distributor and the line i removed from the fuel distributor. Or do you mean i need to trace back the WUR line back and single out that single line alone. Reason i ask is if i trace the line from the WUR on its merry way to the fuel distributor, it tees off multiple times. _________________ TheBib |
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TheBib
Joined: 21 Aug 2011 Posts: 50 Location: Michigan
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Posted: Fri Oct 07, 2011 8:40 am Post subject: |
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Where do I connect the test pressure gauge lines?
fuel distributer
Where WUV line connects to fuel distributer
This is a multiple connection Tee branch that the WUV line connects through on its way to the WUV
Line connected to the WUV
_________________ TheBib |
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TheBib
Joined: 21 Aug 2011 Posts: 50 Location: Michigan
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Posted: Fri Oct 07, 2011 11:05 pm Post subject: Question for Ideola |
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Dan -- in my previous post hopefully the pictures show up. If not let me know and I'll try to re-post. By the way, where I mention WUV I actually meant to say WUR. I'm going to try to work on it tomorrow. _________________ TheBib |
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rhialto
Joined: 08 Jul 2004 Posts: 24 Location: Netherlands
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Posted: Sun Feb 09, 2014 2:16 am Post subject: |
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Double post
Last edited by rhialto on Thu Mar 13, 2014 11:58 pm; edited 1 time in total |
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rhialto
Joined: 08 Jul 2004 Posts: 24 Location: Netherlands
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Posted: Thu Mar 13, 2014 11:57 pm Post subject: |
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I'm setting my WUR at the moment, but I see there's no mention of the control pressure during boost (M31.01 Euro).
Does anyone have the boost control pressure value?
This way I can set the boost control pressure by moving the disk at the bottom of the wur. |
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rhialto
Joined: 08 Jul 2004 Posts: 24 Location: Netherlands
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Posted: Tue Mar 18, 2014 4:56 am Post subject: |
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I found the answer in the "Porsche 924 Turbo Model 79 Service Information.pdf" :
With boost pressure above 0.3 bar at the boost nipple: 2.9 bar +-0.2 bar
In the 82 Service information is the following:
Europe, Rest-of-world, Sweden, Australia: 2.9 bar +-0.2 bar
USA, Canada, Japan: 2.8 bar +-0.1 bar
Maybe Ideola can add this to the list? |
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Tanso
Joined: 16 Mar 2014 Posts: 81 Location: Sweden
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Sat Dec 05, 2015 2:38 am Post subject: |
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Tanso wrote: | So the engine does not need to be started for cold tests? |
No. _________________ erstwhile owner of just about every 924 variant ever made |
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Rasta Monsta
Joined: 12 Jul 2006 Posts: 11724 Location: PacNW
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Posted: Sat Dec 05, 2015 3:58 pm Post subject: |
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Urg, upon starting 12v would go to WUR defeating purpose of cold test. _________________ Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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gerben1986
Joined: 13 Mar 2008 Posts: 232 Location: The Netherlands
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Posted: Thu Nov 03, 2016 1:16 am Post subject: |
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TheBib wrote: | Where do I connect the test pressure gauge lines?
fuel distributer
Where WUV line connects to fuel distributer
This is a multiple connection Tee branch that the WUV line connects through on its way to the WUV
Line connected to the WUV
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5 years later I had exactly the same question. And I found the solution: you need to connect the meter directly to the fuel distributor. So it will be positioned between the fuel distributor and the valve. _________________ 911SC - 1980 |
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Dutch924-racer
Joined: 23 Jul 2007 Posts: 1077 Location: The Netherlands
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Posted: Wed Jun 14, 2017 6:20 pm Post subject: |
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Can you do the warm test without the engine running ? _________________ 937 trackday car
Series 2 engine
951S turbo and intercooler
Fast road camshaft
Forge recirculation valve + boost controller |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Wed Jun 14, 2017 7:01 pm Post subject: |
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Dutch924-racer wrote: | Can you do the warm test without the engine running ? |
Yes, as long as the electrics are working correctly. _________________ erstwhile owner of just about every 924 variant ever made |
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