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Originally Posted by Brian Carlton
Well, now I'm confused. If we agree that we cannot overfuel a OM603 turbo if the boost is completely disconnected and only your right foot controls the governor, then I fail to see how the engine can get overfueled if the boost is running 8 psi. The ALDA will add more fuel because it sees the 8 psi. This is completely independent of your right foot. In fact, as an aside, I would like to overfuel the engine with a small air compressor. I would like to send 10 psi to the ALDA at low power levels to create a "proximity regulator". Again, independent of your right foot. The ALDA opens the rack.
If you can overfuel an OM603, and I am not at all confident that you can, it should be possible to do this independent of of the boost control and manifold pressure. Whether you can or cannot is dependent on the flyweights in the governor. They will not allow more than a certain amount of fuel at a given rpm. Now, if someone will tell me if the governor has a WOT setting where it dumps in some more fuel after your right foot hits the firewall, similar to old carburetors on gasoline engines, I would be most appreciative.
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I think the difference in perspective is based on control. I would be very surprised if the system was controlled by the ALDA or the governor flywheel weights, since these things are not under the driver's control. I would expect these items to put some limits on the machine's response to the driver inputs, but if my injector rack position was under the control of the ALDA, I would be very disappointed. For example, if the car is under full load and I need to take my foot off the accelerator, I want the rack to move right away. On my 240D it does, and on my 1998 E300 TurboDiesel it sure seems to. The ALDA merely modifies what my foot tells the machine to do. It is never in charge.
The same with the governor weights. I believe they are a limiting feature, but I do not believe the normal operating condition under steady state is being limited by these items. It is my foot again. If I push the pedal to the floor, I get fuel enrichment until these items impose a limit. If everything was at a limit all the time, transient response would really suck, if you could get any at all. 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)
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