book spec from vm for the 51a engine is 150 hp 220 lbft. this engine was in my dads old range rover years ago it was a conversion by motor and diesels in a d reg auto range rover. dads now got a p reg 2.5 td bmw engine range rover with manual box. the old rangie with an auto felt to have twice the torque of the bmw engine. and its so simple, push rod engine with literally no electrics to go wrong. external wastegate aswell. ive gotta find out what vm spec boost pressure at as it might have already been adjusted for the original conversion in the rangerover.