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