I doubt a couple of pounds of boost would be any problem. I would first make sure everything was optimal, especially the break open point of the injectors which should be about 1800 PSI. I think you said something about that but I found the benz injectors just needed new springs or shimming to get the pressure up from 13-1500 to the factory new 1800 + spec which means much better atomization. Also make sure the throttle position is correct and you get max throttle. Seen that on a later 240 and it took forever to get that one to 60 MPH. The customer was astounded when he drove the car after we added about 40% throttle position although amazing still means a long time to 60 MPH, but that was in the Florida Keys with route 1 being the highest speed limit road at 45-55 MPH for 100 miles and traffic so heavy you were better off turning right and then making a u turn instead of waiting 10 minutes to make a left turn.
regards
Mech
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