These terms are referring to the same component in the Bosch CIS K-jetronic system. This same basic part is used in not only Mercedes applications but also Porsche, Ferrari, Audio, VW and others. For the sake of brevity, I'll call it simply WUR for this post.

Before I go any further, you should know I am part of UnwiredTools, the VENDOR who sells the digital Warm-Up Regulator Replacement/Upgrade product.


While the WUR, both OEM and the UTCIS, specifically address the function of control pressure management during the warm up cycle of the engine, it also influences the control pressure when the engine has warmed-up.

The lower the control pressure, the richer the fuel mixture. All other things being equal, more fuel will trend toward more power and lower economy. If you raise the control pressure, you lean out the mixture. Less fuel trends toward less power and better economy. The WUR is one of the "knobs and dials" we have to manipulate the economy/power characteristic of a given CIS K equipped engine.

The OEM WUR has diaphragms and bi-metallic metal strips internally for a mechanical interface to the control pressure setting. Mercedes (and other) applications also include a port for sensing Manifold Air Pressure for "full throttle enrichment". To make adjustments to the Control Pressure you require a hammer, a punch and a CIS gauge set.

The product being announced in this thread, the UTCIS-V, is designed to replace all Mercedes OEM WUR parts numbers. The product installs in place of the OEM WUR and includes a small, digital controller box which interfaces with your PC. With the Engine Management software (free), the warm-up control pressure curve and the "run" control pressure can be specified by you, or your technician, as appropriate. The Warm-Up cycle is a series of values over time and temperature. For example, the control pressure should be different at 0 degrees C than at 25 degrees C - the control pressure is set lower when starting cold to provide more fuel, etc. When the engine is warm, there is a range of values for Control Pressure to be set; you specify the desired control pressure relative to Manifold Air Pressure.

For more info on how this operates, you are invited to look at the materials on our website, including an installation manual and a document on how to use the UTCIS Engine Management software.

If there is interest in a more public discussion of how the product works here on the forum, that would be great, but I don't want to over-step the bounds of the use of this forum, so we will not do so without specific invitation and blessing from the moderator(s). However, if you have specific questions, please do not hesitate to ask!

Thanks to Mercedesshop for the opportunity to make this announcement.

Frank
UnwiredTools, LLC
http://unwiredtools.com/utcis.asp

I saw this, and I've been to your website, and there's one thing that's kind of a show stopper for me until I get more information. Maybe you could answer it here?

Do you have "default" profiles that can be loaded and then tweaked? I have a CO meter, but I'm not comfortable starting from scratch. I'm not an engine tuner, and I don't particularly want to be.

Great question. Yes, we have some sample MAPS and they will be posted within the next few days on our site. We also have a mechanism under way for "sharing" Engine Maps where you can save a specific map from your computer to our webstie in order to share it with others. Similarly, you can browse the maps available on our site. Both the sharing and the browsing/downloading will take place from directly within our software. We're working out some of the kinks in that at present and this feature will be enabled in an upcoming release of the software.

Beyond that, the files may also be shared between users via email or posting a file to the forum, etc. The Engine Management map itself is just a file that you can easily save to your computer. Our vision is that folks will have an Engine Management Map that works great for their car and they will share it with others on the forum. There are a couple of informational fields in the Engine Map which stay with the Map, even as programmed into the part. In this way you can see who made the map and what their comments were - ie, modified Control Pressure to 3.7 bar to get better economy at such and such Manifold Air Pressure, etc.

I should also point out that the product comes equipped with a default map already programmed in, so you can easily extract it to your computer and modify it.

I will make a post here when the maps are available on our website for download.

Thanks for the question! Hope that helps.

Regards

Frank
UnwiredTools, LLC
http://unwiredtools.com

After I read the manual on this excellent product, it does the same thing as the EHA valve on the W126 models.

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.

Sort of, The EHA valve is indeed a variable valve which sets the control pressure. The UTCIS has a pressure sensor to measure the control pressure, making the control pressure a regulated loop. This is a first for CIS and it adds a lot of responsiveness, precision and control to CIS.

The EHA valve uses a current from the ECU to control flow in the EHA. The current vs. flow of the EHA changes over time. The EHA can be adjusted but it will fail eventually. The UTCIS uses a stepper motor driven needle valve which does not shift over time.

We've had a lot of requests for a similar upgrade to CIS-KE. We're reviewing this closely and we welcome your input.

Adding an input for an O2 sensor is a good idea and we're working on it. An O2 sensor is a very good performance tuning and diagnostic tool.

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Steve S
Support Tech
UnwiredTools, LLC
www.unwiredtools.com

1982 380SLC
1994 E320TE
1998 E300DT

Interesting

Yep, got a WUR...

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83 500 SEC Euro 198K