BTN explain

BTN Turbo state that the overspeed of turbochargers can cause severe damage. Overspeeding occurs when the turbo rotates at a greater speed than its operational limits and can push the turbo beyond its safe operating parameters, causing it to fail by damaging the turbine or compressor wheels and bearings.

BTN Turbo also say that “overspeed can be caused by a restriction in the air intake filter or pipe work, or a split or detached air hose, allowing incorrect amounts of air into the turbo. Other causes include incorrect volume of air in the turbo, a ‘chipped’ or ‘overfuelled’ engine that isn’t to standard specification, worn injectors, loss of signal to the Simple Rotary Electronic Actuator for the wastegate or fitting the incorrect turbo”.

BTN advise technicians to check that there aren’t any restrictions or leaks in the air intake so as to avoid potential turbo failure from overspeed.