Reliability was very much an issue. It was highly tuned and went wrong veryoften...at that RR it was blowing smoke out of the turbo. :/
Thing is though, is that it was usually the aftermarket parts that went wrong.
I'm sure the turbo wasn't the original item, the actuator bracket that snapped would have come with either the turbo or actuator, the Samco hose that ripped open...
I don't recall him mentioning any problems with the engine.
Either the aftermarket bits were underspec'd/overworked or it was a bad combination of components. Hardly the fault of the car.