UTI WUR upgrade

[etmerritt33]

http://cisflowtech.com/

If you don't have a factory CIS system I would not do a fresh install. There are better options if your car didn't come from the factory with CIS. I think the system works great when everything is close to perfect. Honestly, I still love the old Bosch mechanical fuel injection system like the 6.3's, 600's, and early Porsche 911's. Lots of moving parts to wear but when setup well it's very enjoyable to drive a car with it working perfectly. That system runs super smoothly, delivers great power, and has really nice throttle response, much better than CIS in my opinion.

Give Larry a call. He knows CIS inside and out, has some not readily available Bosch factory reference manuals, all the proper test equipment, He's also a good guy and he's easy to work with. Having the system on my 6.9 was worrysome until I found Larry. Almost no one has the knowledge, experience, and equipment to service the WUR and FD. That was not an easy problem to solve.

Hope these helps.

Tom

[Fulcrum525]

The idle on my friends 280CE is very rough and the previous owner stated that he adjusted the idle up and that he might have burned the WUR. What will be my options if I have to replace the WUR without going into the electronic solution?

[etmerritt33]

Get in touch with Larry. I have a pretty unusual 85 Euro 280E 5 spd manual. It has 118K miles with an incomplete service history. Very good compression 180-185 PSI across all 6 cylinders.

When I got the car it had been sitting for a couple years which is normally bad news for FI. The car had been brought to the States very shortly after delivery in early 1985 from the factory in Stutgart. Initially, I thought the car ran fairly well but the more I drove it the worse it ran. The WUR on was worthless as a core as it had no atmospheric or vacuum ports. It was evidently something that these federalization companies used.

Larry custom built me a Bosch WUR based on the last version for the Euro 280E and he even punched the correct number into it. I lucked out on the FD and the injectors as I had expected to have to replace them but in the end they were good. We put the entire FI system back to factory Euro spec.

The car runs better than I had hoped it would. I think it cost me about $ 1200 to put the system back to stock. It runs like a bat out of hell down country roads or on the highway. Starts immediately and idles perfectly. It is very strong for a 2.8 straight MB six cylinder.

I think the WUR cost was just over $ 300 and that was because I didn't have a rebuildable core WUR. You should be able to get your Bosch WUR rebuilt for under $ 300 which is a deal when you consider that some new Bosch WUR's have gone over $ 1000 from MBCC.

Here's a link with more info. There are a couple others related to sorting my 280E on this board as well. http://w123gassers.smfforfree2.com/index.php/topic,709.0.html

[Fulcrum525]

I will most likely go down this route with the 280CE. I just hope that it wasn't butchered when it was federalized (Perhaps they were less stringent in 1980 then in 1985....then again I never did find out when the car was actually brought to the US so this might end up hurting)


I have much more experience with my diesel and haven't really had a chance to dive into the 280CE. Is there a post somewhere that details how to get at it? Also approximately how long would it take him to rebuild and calibrate the WUR? (Assuming it's an acceptable core)

Also I originally looked that the UTI upgrade as well but the owner of this 280 will probably never have any need to get that precise. Stock performance will be perfect.


And yes, under $300 is a heck of a much better deal then brand new (I checked the dealer prices for them....#1 they didn't know what it was at first but #2, once they found it....ouch)

[etmerritt33]

Sounds like you have a good, systematic approach in mind. One thing on these cars worth mentioning, I was shocked at the location of the WUR in comparison to the 6.9. The 6.9 is right in the middle near the front of the engine and is easily accessible. On the other hand, the 280E WUR is underneath the car and near the bottom of the engine bay. It is much harder to R&R and it also does not lend itself to being good for the UT WUR given greater exposure to the elements. It can be relocated without too much trouble if desired.

I am very critical and difficult to satisfy. But, I'm very pleased with how my euro 280E runs and drives at pretty close to euro stock. It actually is 100 percent euro stock because the EGR is disabiled. It has a new euro exhaust system. I removed all of my federalization equipment. Mine may not be perfectly tuned either. I have not bothered to check the control pressures but I'm pretty confident that Larry calibrated it correctly. Ignition timing and idle mixture very likely not perfect either.

Anyway, if you like the car I think you would be very pleased with the outcome should you decide to do something similar. The advantage you have over me is that you have had the opportunity to drive one of these far longer than I have so you should have a pretty good sense about whether you want to go to the expense of making this change on this particular car.

Let me know if I can help. I think I have just been down the road you might decide to take. Hope this helps.

- Tom

[Fulcrum525]

Originally Posted by etmerritt33

Let me know if I can help. I think I have just been down the road you might decide to take. Hope this helps.

- Tom

Very much so.

I remember asking where the WUR was when I went to look at the car with my friend and he said "Down there".......He pointed but you really can't see it from above. I've been dreading the day when I have to remove it....then again I did the starter a few months back and that really wasn't too bad. (Assuming you do it correctly of course) Seriously though....there is so much space on in that engine bay that its actual location staggers me.

I've only driven it a few times for a few miles but I have to say it was a blast to drive although I can't help but feel that it's actually down on power, i'd do a 0-60 run but the speedo cable also needs to be replaced as well (The car had a list of things that it needed since it was purchased but the starter caught us off guard and took immediate priority) It's already received a new AC belt and it has a spare rear diff in the trunk that will also eventually need to be installed.

One thing at a time though, the other unexpected thing needs to be addressed.
I HATE losers....
(New glass purchased from a forum member and should be here this week)

I need to spend some time with the camera to find out more details about it (For example I never stopped to think if the exhaust was Euro or not....) Although we did put new hangers on it

[PanzerSD]

would my WUR benefit from a general cleaning? can it be take apart?