Just put a hobb switch in for a boost-full throttle contact. The cis-e will go for full throttle enrichment at around 9 ma. I had this on mine for years. I did this because I was always lean until I hit full throttle contact and then I was fine. Under part load the cis-e runs very lean.

i hear you dude.only thing is the t3 t4 only starts boosting by 3500-4000 rpm. And i only get those kind of revs if i floor it. So i need it to enrich past the full throttle current.

You can also switch the coolant temp sensor to 20c with the switch. This will put you in cold enrichment which is a lot of fuel and open loop. If that does not work then adjust the screw on the back of the eha. There is a flat blade brass screw.
Remove this one and then there is a small allen head. If I remember right you want to turn it clockwise but it could be counter clockwise. A quarter of a turn or less at a time. If you go the wrong way just turn it back and then the quarter of a turn the other way. I ran up to 7lbs of boost on this setup. I looked into having an enrichment setup like you are talking about but you need to have a double poll relay to make the switch from the cise control unit. I thought making the switch without setting codes was going to be the problem. I still wanted close loop operation when not driving hard.

tell me, how did you rig up this switch? And what do you mean about codes?

remember, i dont hav an o2 sensor so there is no closed loop feedback.

Just used a boost pressure switch. I actually stole a switch out of a Mercedes pneumatic systems pump from a S class. It has an adjustable pressure switch.
I set it up to close contacts at the point the manifold switched over to boost. This jumped the full throttle contact switch. You could also use this same design to add resistance to the coolant temp. Or just run it all the time with the resistor in it. I think that some where around 10kohms off the top of my head should be close. Honestly though at 4-5lbs of boost you should be ok with the full throttle enrichment. But if you are not running closed loop then you could simply add a dash pot like RBYCC said.

to be honest the other method sounds alot simpler.did u have a look at that pdf? Its one box. But im interestd 2 know what u meant by codes? Fault codes?

if i put a resistor in the path of the coolant temp sensor then there will be no cold start enrichment? And i wouldnt get a reading on my temperature guage. Or did you do it some other way?

Any time there is a fault with circuit the control unit sets fault codes.
The resistor in the coolant circuit will make the control unit think it is colder.
At 20c cold start enrichment is on.

ok. Forgive me,im still learning. For a long time i didnt even know this car had an ecu. In fact my merc mechanic even told me that. But i tend 2 think he is full of hot air. He once told me that the weight of your oil doesnt affect engine temperatures and oil consumption. Anyways, what problem would i experience as a result of these fault codes? Would they get stored and clog up my ecu? That pressure transducer will by applying 20mA of current directly to the eha valve straight off the battery. Would i get an overvoltage fault code?is 20mA enuf 2 do that? And how do i get the fault codes cleared? Sorry for so many questions.

It's not an ECU as you would think it is..
The EZL is very basic...doesn't do many calculations based on inputs and doesn't efficiently blend the timing and fuel controls together...
Remember you are pre OBD so fault codes aren't many and not easily read as in an OBD car...

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1971 280SL ROADSTER
1988 300CE TWIN TURBO WIDEBODY
1994 E320 CABRIOLET
1999 C43 AMG
2005 G55K AMG
2008 CLK63 AMG BLACK SERIES

thats gr8 news. Btw i dont have the EZL device. Freakin boring i know!

I have noticed that the 2.0 and 2.3 injectors have different part numbers. Do they also have different break/opening pressures?

The reason im asking is coz i saw a guy on a vw turbo forum run a 5th injector off the return line from the distributor to the fpr.

the 560 sec injector has an opening pressure of 4.5 bar :-)

the 300e and 260e and 2.3 injectors have an opening pressure of 4 bar. And the 1.8 and 2.0 injectors open at 3.3 bar. What i need now is a fuel pressure guage to test my fuel system pressures.

just got my car back from the mechanic. I spent so much and they did so little. So heartbreaking. But on a happier note, i found a 3.92 diff and brake calipers and discs from a 300e. Bought a multimeter and angle grinder and have located a wealth of info on testing and repairing k jet systems. Oh and i ordered a rising rate fpr.comes with a guage for testing pressure. I was reading the haynes databook and it says the compression ratio on the 2.0 is 9.1. Its almost as if MB knew we would want 2 turbo these things one day.