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WUR testing

 
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joemoma1990  



Joined: 29 Jun 2021
Posts: 32
Location: Apple Valley, MN

PostPosted: Thu Jan 20, 2022 12:43 am    Post subject: WUR testing Reply with quote

I finally got it started but it is running rough and I have to tap the flap to add fuel to get it to smooth out. So I assumed there is a problem with the WUR. I want to make sure I am testing this correctly.

I hooked up my gauge to the center hump on the fuel distributor.
I tested the pressure with the valve closed. I am getting 80 psi.
I open the valve up and the pressure dropped but immediately went to 80 psi

So I assume the WUR is bad? I had it out this last summer and cleaned and I think tested it correctly, if I tested this correctly I want to replace it. It's -5 here in Minnesota not going to get to pulling it out quickly is there multiple part numbers for it? I was going to order 0 438 140 011 from Special T

TIA
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924RACR  



Joined: 29 Jul 2001
Posts: 8794
Location: Royal Oak, MI, USA

PostPosted: Thu Jan 20, 2022 1:54 am    Post subject: Reply with quote

Yup, that's a bad WUR - it should stop at a lower control value, per the manual, once the valve is opened.

There are multiple part numbers, unfortunately.
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'79 924 #77 SCCA H Prod racecar
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Eliza  



Joined: 17 Aug 2015
Posts: 174
Location: Prov. Utrecht, The Netherlands

PostPosted: Fri Jan 21, 2022 4:07 pm    Post subject: Reply with quote

Depending on model year and engine, PET does show which WUR should be the correct one. The Bosch number you have is for an n/a ( at least for RoW cars ) not a turbo.

Time to go cross-referencing

Eliza
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1981 931 S2 RoW
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