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Designer King
 
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Mike,
You are changing both. If you need to change the warm relative to the cold, you have to access a screw inside and underneath the pivot area. On some WURs you canget to it via a brass cap on the bottom that can be pulled off, revealing it. I think JW has a thread on doing this. Some units do not have this cap, so I am guessing that you will have to open up the WUR. Maybe this area can be drilled out to expose the screw, but I don't know for sure. Apparently to make this change requires a much greater amount of turn than w/ the mixture screw on the mixture control unit.

Correction: changing the level of the plug only afects the cold cp.
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Last edited by Paulporsche; 08-21-2008 at 01:49 PM..
Old 05-06-2005, 02:18 PM
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Paul,

Ok...that makes sense. Thanks much.

Mike
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Old 05-06-2005, 02:30 PM
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Quote:
Originally posted by ianc
The Porsche factory manual publishes a graph of acceptable pressures for a given temp for each part # WUR.

ianc
Is it possible someone can scan this graph and add it to the thread? It would definately be a good resource for anyone going my route and using an non-OE WUR.
Old 05-09-2005, 04:23 AM
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Only one thing you need to be careful of with the adjustment mod. You should make an index mark on the pin and the body of the WUR and keep an eye out for the two marks not lining up. I think the original WUR mod had an indexing pin machined intot he dowel. If the dowel rotates then the heating element does not sit right inside the the housing and can cause binding, etc.
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Old 05-09-2005, 04:34 AM
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Reviving

I thought I would revive this old/great thread. I've already asked Tony separately, but I am wondering about how interchangeable the WUR's are, if made adjustable.

For example my 1981 090 WUR is not functioning properly (resistance = 9 OHMS), but I have a 1976 033 WUR that I made adjustable some time ago and want to use. I know that each WUR might have difference specs/configuration between years and ROW or US cars.

But from my understanding, I would guess that any vacuum 1976-1983 WUR is interchangeable and the 74-75 WUR is not?

Hoping this information proves useful for those that may run into WUR problems and might need to source parts that are not available/year specific.

Thanks all.
Old 05-13-2016, 10:11 AM
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For what it's worth my 1981 SC has a 1979 3.0 long block in it with a "045" WUR and 1981 CIS induction, kinda weird
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Old 05-13-2016, 10:25 AM
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My California '79 SC has a Euro WUR, I think eighty-something.
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Old 05-13-2016, 11:58 AM
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Thank you for the input, Steve. And what control pressures (warm/cold) do you use to ensure you car is running well? The 81 numbers?


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Old 05-13-2016, 12:06 PM
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This has been around a long time.

Porsche 911 Warm-Up Regulator Adjustability | 911 (1965-89) - 930 Turbo (1975-89) | Pelican Parts DIY Maintenance Article
Old 05-13-2016, 12:13 PM
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Thanks for the article. I guess I'm just interested if any WUR can be made compatible to work with any CIS. Do you know?


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Old 05-13-2016, 12:52 PM
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My adjustable warm up regulator. has worked great for over 5 yrs now. Complete control of afr at all time.
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Old 05-13-2016, 01:12 PM
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Use a similar WUR as replacement.......

Quote:
Originally Posted by tito911s View Post
I thought I would revive this old/great thread. I've already asked Tony separately, but I am wondering about how interchangeable the WUR's are, if made adjustable.

For example my 1981 090 WUR is not functioning properly (resistance = 9 OHMS), but I have a 1976 033 WUR that I made adjustable some time ago and want to use. I know that each WUR might have difference specs/configuration between years and ROW or US cars.

But from my understanding, I would guess that any vacuum 1976-1983 WUR is interchangeable and the 74-75 WUR is not?

Hoping this information proves useful for those that may run into WUR problems and might need to source parts that are not available/year specific.

Thanks all.


Eric,

You have an '81 SC with lambda in a '76 car. As you will find later, the WUR-090 for the '81-'83 is totally different from the WUR-033. Install the -033 and find out the result. It will not prevent from a cold start but would have cold idle problem. The operation and internal parts in these two (2) WUR's are completely different. Making a WUR adjustable is a band-aid fix specially if you have to make adjustment seasonally. A well calibrated WUR would not require adjustment or tinkering for many years. Find a good working WUR-090 and compare its performance. BTW, a WUR-072 is a good substitute for WUR-090.

Tony
Old 05-13-2016, 01:12 PM
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Thanks all for your input.


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Old 05-13-2016, 03:51 PM
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Thumbs up

"Thank you for the input, Steve. And what control pressures (warm/cold) do you use to ensure you car is running well? The 81 numbers?"

Hello Tito, going to check this out after I make 10mm tool to remove the connecter at the fuel dist. Don't want to round off the ears of the nut without a correct fit Pretty tight there for standard wrenches.
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Old 05-13-2016, 04:15 PM
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Quote:
Originally Posted by klaucke View Post
Is it possible someone can scan this graph and add it to the thread? It would definately be a good resource for anyone going my route and using an non-OE WUR.
There are different graphs for different applications.

What year are you seeking?
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Old 05-13-2016, 06:29 PM
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11-year old post.........

Quote:
Originally Posted by Bob Kontak View Post
There are different graphs for different applications.

What year are you seeking?


Dear Bob,

Are you aware that you replied to an 11-year old post (circa 2005)? You might as well attach the control fuel chart he requested.

Tony
Old 05-13-2016, 06:43 PM
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Probably more than you want to know, but we have a CIS website here:

Porche Enthusiasts Page

The adjustability mod being talked about is only for cold control pressure. Fuel distributors and WUR are matched set for the 911, so if you want to search compatibility for different WURs you need to know which fuel distributor you have. You can get close enough to get by but for optimum performance the correct unit should be used.
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Old 05-14-2016, 06:22 AM
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Adjust WURs Interoperability

The reason I revived this 5+ year old thread was to discuss the interoperability of a Porsche part that is hard to find and challenging to fix. If, as this post and the Pelican technical article suggest, WURs can be made adjustable, it seems logical that different year WURs can be used on different 911 CIS systems. For 911s between 1974-83, this might be of interest and helpful as other WURs could be used. This is not true for all WURs. I understand that 1974-5 WURs do not use vacuum and may not interoperable with 1976-83 911s (and vice versa and shown here).

For example, I have a 1981 WUR, where the resistance does not test correctly. However, I happen to have a working 1976 WUR that I made adjustable a few years ago. It seems logical to me that if I adjust my 1976 WUR to 1981 control pressures, that my engine would run as well as my 1981 WUR. However, I understand the two WURs are different enough that even if I "adjust" the 1976 WUR it will not achieve the cold/warm pressures on a consistent basis.

Hope that helps to clarify for future readers.

Here are the WUR pressures, that I believe Tony suggested posting.

Old 05-14-2016, 06:39 AM
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Quote:
Fuel distributors and WUR are matched set for the 911, so if you want to search compatibility for different WURs you need to know which fuel distributor you have.
Here is the answer I was looking for. Thanks and would be interesting to know what differences there are between fuel distributors.

I hope to have Tony fix my 1981 WUR so that my "matched set" works correctly.
Old 05-14-2016, 06:45 AM
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OK on closer reading, realize there are two variants.

http://www.pelicanparts.com/techarticles/911_warmup_reg/911_warmup_reg.htm from Bob Tindel

and

using the allen head screw as described by the OP and Modified my WUR

Second method looks the easier of the two to install.
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Last edited by pmax; 07-21-2017 at 06:20 PM..
Old 07-21-2017, 03:11 PM
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