The pop off pressure is critical ~ so important in fact that I have the injectors in my 240D done by greazzer because he does them all to within 5 # of each other and this makes for a smooth running engine .

The good fine mist spray pattern is nice and important but smoking is caused more by low pop off pressure, I learned this from a fellow who use to be here who didn't ken the fine mist aspect of fuel injectors but had a nifty home brew rig that he used to set the injectors on my first 300CD (NA) to perfect pop off , he also used dental tools to ream the injector nozzles so they sprayed like tiny fire hoses, yet the car didn't smoke and started easily in 40 degree weather on 1/2 crank .

DO NOT DO THIS ! you need the fine mist spray pattern .

This is a delicate thing, your engine and fuel injection system ~ take the injectors to any Heavy Duty Diesel hp and they'll pop test them correctly and give you the exact pop off pressures .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better