I'll bet that this has been tried before (hard to come up
with truly original ideas), but has anyone heard of using a
'plug' in the end of the intake bellmouth as a throttle?
What I'm seeing is something shaped like an oven baster,
with the pointy end into the bellmouth. If it has an inside
radius which follows the bellmouth shape of the intake,
couldn't you have throttle action without the turbulence of
a butterfly valve (or slide at part-throttle)? I can see a
few design issues, like complexity, having enough force
available to overcome the vacuum as you try to 'open' the
throttle, & designing for 'fail open' instead of 'fail
closed,' but for the moment I'm just interested in the air
flow issue. I'm also assuming that throttle response & idle
characteristics won't be problems due to using electronic
injection.

Somebody shoot this full of holes. I can take it.

Charlie England

Charlie, all ideas are valid, some are just easier to implement. Along the way even seemingly impossible ones stimulate alternatives that hatch the brilliant ones.
Put your largest hose (3") on your shop vac, turn it on and try to modulate it with a paper cup stuck in bottom first. It gets a bit wild that last half inch.
...Chrissi

 
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