The only car that actually applies this technology efficiently is Porsche in their 997 Turbo, I can't think of any other automobile that uses other than the diesel trucks. I wouldn't be surprised if it did indeed operate on centrifugal force alone. When reaching different impeller rpm's the blades could theoretically spread out when the specified tension is reached on them pulling them outwards. Some sort of actuator otherwise has to be employed.  Going to do some more research. 
__________________  1987 GN - 009's 42.5LBS Injectors, TE-44 Turbo, Hemco Plenum, Walbro 255 (Hot wired), Hooker Down pipe, Auburn Rear, 2-3/4" Flowmaster Exhaust, Scanmaster version: (busted), Airbags, Weld Pro Stars w/traction-less 255/60/R15 tires
Best ET: 12.64 @ 106.79mph w/1.948 60' - 20psi and 94 Octane http://www.youtube.com/watch?v=zdwFF1BJY2Y 
"Anyone can fire a bullet....but only the select few can steer it"
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