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he 2001 model TiD has huge engine differences over the previous years TiD engines. 125Hp over 115hp, and 280NM (some sources say 290nm) Torque over 260NM, but that doesn't tell half the story over the engine improvements. New for 2001's TiD engine included better oil cooling, new improved pistons, reinforcement of the engine to cope with Torque, new fuel electronics, incorporating the new Bosch PSG-16 Diesel integrated fuel pump/ECU, totally new electronically controlled EGR (Exhaust Gas Recirculation) system and the icing on the cake, model year 2001 Saab TiDs are fitted with a Garret 15 VNT (Variable Nozzle Turbine) turbo. Unlike conventional Turbo designs, this turbo has no wastegate, but is instead controlled by a set of guide rails on the exhaust side of the turbo. The turbo pressure control system controls the turbo so that on low gas flow, the turbo speed increases and hence the boost pressure. This means that a higher engine torque even at low engine speed. At higher gas flow, the turbo unit speed is reduced to avoid over-revving of the turbo, but still gives the desired boost pressure.