I was only doing 80-85 mph tops, and it was running only 6psi boost. Just to clear up any confusion.

It was only running base map, as the car has only just been put back together after being off the road for 2 - 3 years, the engine was re-built over 45,000 miles ago, but used the base map to put some mileage on the whole car, as it had new suspension, engine management, and a few other mods. And i wanted it to be all running with no teething problems before it was mapped. As i was told for an engine mapper to have to sort minor problems out first on a car that is "suppose" to be ready, is a major pain in the ass so thought i would make 100% sure mine was OK first.

As it turned out i had an intermitant fault which caused the car to "die" with no warning what so ever, which was dodgy plug connections on the phase sensor. And it had a sticky starter motor, both of which would not have shown up if i hadnt put some mileage on it.