Heres some info that may help. Also at the end is a link to the actuall topic on another board where i got this info. Good source for Water-Cooled Info.

CIS basic is a purely mechanical(some might say "hydraulic") system, no ECUs at all. "Euro CIS" falls under this category, and it what came on the 139hp 1.8 16v motors in Europe. See that afore mentioned "faq" for greater detail.

CIS Lambda uses an O2 sensor connected to an ECU to modulate a frequency valve, assuring a mixture that is within a clean yet fairly powerful range.

CISe takes it further, using more electronics to affect mixture and performance. Typically, this was matched to a knock sensing ignition, so there is a seperate ECU for the fi, and a another for the ignition.

CIS Motronic has the ECUs combined into one version, and is basically the height of evolution for the CIS systems. Chippable, and very capable of supporting generous hp #. Think 2.0 -2.1liter 16vs with portwork and cams.

I think that's it in a nutshell, some one else feel free to elaborate or correect any inaccuracies, please.

CIS is very capable, even in it's most basic forms. Typically, you can bump hp by 50% over stock and not run out of fuel. They were ready for us  



CIS Euro - No ECU, 80mm air flow sensor, External control pressure regulator
US CIS Jetronic (basic) - No ECU, 60mm or 80mm air flow sensor, External cpr

US CIS Jetronic (Lambda) - ECU to control freq. valve (i.e. fuel mixture) based on oxygen sensor input, External cpr

CIS-E Jetronic - ECU controls cold start, idle and WOT fueling among other things; no External cpr rather a differential pressure regulator attached to side of fuel dist.

CIS-E Motronic - Similar to CIS-E Jetronic, but can chip the ECU

For more info, check out any of the Bosch manuals on the variations of CIS fuel injection.  
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