Clean the overboost protection valve; don't bypass it, if it's "slow". If your wastegate hose cracks or falls off (it could happen ) the T3 turbocharger can put out 25-30 psi (with concommitant fuel enrichment). Without the overboost protection valve limiting it to 1.1 bar, you can have a 300SD with a really low 0-60 time, BUT a really short melted piston time (est. ~ 5 minutes at load ).

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)