I am confused as to how a Turbo operates in my 1985 300TD. The car is quite slow up to about 2500 RPM when it suddenly starts pulling. Is this turbo unit pedal actuated or does it engage only after certain RPM? I drove an Audi recently where turbo engaged as you pressed the gas pedal but my car does that only after it passes 2500 RPM.

Igor Zeljic, Minneapolis.

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1984 MB 300D Turbo Diesel W123 Sedan 132K
1987 MB 300D Turbo W124 Sedan 295K
1983 Porsche 944 104K
1989 Audi 80 Quattro 180K
2002 Audi A6 3.0 Quattro Avant 49K (Wife's car with warranty )

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