Charles
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Would the bearings and the shaft in the little turbo be able to handle the stress of that high boost and for how long?
The second and third stages would be running at less than stock boost. Other than the increased exhaust temp they should outlast the chargers on a stock truck.
Don't the 6.4's make like 40lbs stock or something close? If the first stage made 25 and the stockers made 40 that would be over 132lbs of boost on the manifold, so obviously they would have to be backed down quite a bit in a triple turbo setup. Even if they only made 25lbs and the first stage made 25lbs that's still over 90lbs on the manifold.
I think they would just be loafing in a compound setup with a third charger.
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