I say let him try... :-p
I do have my own 2 cents to throw in here. Mechanic, have you consider store the steam in a reservoir and releasing into a 2nd turbo? Something to simply raise addition compression in the diesel engine when accelerating or pulse-gliding? Basically making a momentary boost in PSI by use of a secondary air injection. Not sure if theres any efficiency to be gained, but if you could tap a few (2-4psi) extra momentarily, it may be something worth trying as well. And you won't be blowing water vapor into your motor.
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