Don't.

These usually produce 12-13 psi already, leave them alone.

If you have poor power, look for plugged trap oxidizer (my brother just had his changed, 87 300SDL, 145,000 miles), clogged boost control lines, etc.

Bad turbo will also give low power. Wastegate usually isn't the cause, but I don't know of a good way to test a turbo other than to blow compressed air into the turbine and see if it generates pressure. Boost pressure can be check with a gauge "t'd" into the boost control lines. Certainly, I'm not equiped to check speed, balance, bearings, etc.

Unless the catalyst is shot, you won't see much smoke on these cars, however much they are really making, so adjusting the ALDA would be difficult without proper test equipment, to say nothing of the fact that it will need to be removed for each adjustment! (unless you take the intake manifold off each time, that is!)

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!