I find the going isn't the problem, it's the stopping. The small engines have no engine braking full stop long period that is it good night nurse delight.
Where the bi-turbo falls over slightly is where you are running at the crossover point between the two hairdryers and then dump your foot up it when the poor little sewing machine is already working hard. If you are following one towing and it is on a hill that gets steeper and the thing starts pumping black smoke thats what has just happened. It's not exclusively a Ford problem, any twin turbo will do it in the right circumstances. Not good for longterm engine life as the piston and cylinder temps are going through the roof in that situation and the exhaust temps are about to join them...
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