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Most diesels that I know of do not have a map sensor, the intake is just open, also in engines the so called "restrictions" are not that, unless you don't believe in math, not to say you should believe in math, it's full of theory's, just like evolution is.
The fluid dynamics of pulses of air react differently with different speeds and frequency, length and size of intake and exhaust affect this, but when you add a turbo in to the intake it's less so on both ends because of how the turbo soaks up the pulses.
your question however was on fuel usage, your throttle connect to your injector pump, or on a common rail diesel, to your injectors with a connection to the waste gate on the turbo to give the engine more air when the amount of fuel being injected gets high enough.
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