By the horsepower numbers, it looks like you have an OM603. Not sure about
the gasket questions, but it looks like I may need a couple valvelifters at
179k here (getting that nice tappety tap noise).
As for power, the problem with these engines is not lack of fuel or turbo
pressure, but temperature. You can lock the wastegate shut and do a quick
run or two, and chances are you'll get no extra power from the 22+ psi. You
can also turn the ALDA adjustment as rich as possible, but you won't see any
gain here either. Doing both you might see a bit of zoom, but you'll be
COOKING your valves. The only solution (it appears) is to get an
intercooler, which can boost power to about 180hp. Mosselman Turbo of
Holland makes a very nice bit of kit for european 300DTs:
Claimed power increase is around 178hp and 250ft/lbs with proper ALDA
adjustment. The whole kit runs about $1400 and looks to be very desireable.
Still waiting on a US version that's compatible with the EGR and AVR mixing
crap on our engines.
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