James Watson Motorsport is an elite New Zealand engineering facility specializing in advanced powertrain solutions and bespoke race engine building. Our expertise encompasses high-performance and historic racing platforms, including the meticulous assembly and tuning of BMW S50b32, Holden 308, and Toyota 4A-GE race engines. We complement mechanical builds with cutting-edge ECU tuning to maximize reliable track performance.
A critical focus of our operation is specialized transmission and drivetrain mastery. We are experts in servicing, building, and optimizing Staffs gearboxes, Hewland Ft200, and DG300 transaxles. Our precision setup of Clutch pack LSDs and cam and pawl diffs ensures optimal power delivery, corner exit traction, and reliability for Formula 5000 and premier historic race cars.
