On my 1998 E300 TurboDiesel, when I ask for more power at 70 mph and press the pedal down to the floor without inducing a downshift, I get some extra particulate. In fact, I am at a loss as to how the engine would respond to a demand for more power if you did not have the abiity to chuck some more fuel into the combustion chambers. Normally the driver is the feedback mechanism that decides if the car is running as it should for the conditions. The inter-relationship between boost pressure and fuel load is not in the driver's control loop, so the only thing the driver has to manipulate is the mechanical (or electro-mechanical in some cases) fuel enrichment lever.

To address your question directly we would have to know a little more about the situation than I do. Maybe others are more knowledgeable and can pipe in. But as I understand things from a steady state running condition to increase speed or climb a hill, the fuel is enriched first, then the boost climbs, and you settle at a new equillibrium. The driver controls this sequence with his/her right foot. So, in my opinion, unless 11 psi boost only happens with fuel load at maximum (pedal floored), then yes, at 11 psi boost you can have varying degrees of fuel enrichment, depending on the accelerator pedal position. In the case I was responding to, I believe the boost pressure might have been limited to something like 8 psi, and then, when the right foot signal arrived to ask for more power by enriching the mixture directly, the boost did not go up and the mixture stayed too rich, or richer than desired by the engine controls' normal measure of goodness, resulting in increased temps and some smoke out the back.

My view on this is the driver has ultimate control since no electronics to date can understand the driver's intent and deal with it electronically. Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)