Procharger put a CVT on a centrifugal supercharger
 

i-1 Supercharger

https://www.miataturbo.net/attachmen...ine=1374594522

http://i54.photobucket.com/albums/g1...ps343c9f7d.png

Expensive? Yes.
Complex? Yes.
Reliable? Who knows?
Better than the royal turbo? Maybe?

I'm honestly shocked this is a "new product" and just now being made. Just seems like a no-brainer that shoulda been developed ages ago.

In for results. Hopefully positive

Agreed. When i first saw a rotrex as a teenger this was my first thought.

Dann

Questions that arise at 1st glance:

is the cvt to multiply the rpm as it rises on the engine? meaning it starts off at slowest speed (the concern here would be overspinning the compressor like crazy)
or
is the cvt to increase rpm down low and decrease it up top? (resulting is a less pathetic lowend/midrange that these things usually put out, and no threat of overspinning)

so many betters. i honestly thought this was going to be the main idea/difference in the Rotrex when it was first talked about. When it turned out to just be another centrifugal SC I didnt understand why everyone here was ever excited about it.

you're kidding right?

nvm didn't see the link the 1st time around, just read up on it

Seriously. For years Ive been thinking "why doesnt someone slap a snowmobile CVT on a centrifugal compressor?"

18,
Its utilizing some kind of electronic control, so it could be as advanced as measuring boost, and maybe even compressor speed (optical or hall effect sensor perhaps?), and using that feedback to control speed.
But yes, at the most fundamental level, I believe it is running at a high ratio at low rpm, and then lowering the ratio as RPM increases, keeping the compressor speed constant.

Its like a backwards CVT

Im keeping an open mind ;)

On one hand, the turbo isnt putting parasitic drag on the crank or adding inertia to the drivetrain, but on the other hand, without high pressure in the exhaust manifold, the supercharger will have better scavenging and allow for more aggressive tuning.
Im not sure how far these factors balance each other out.

Of course the turbo certainly wins when it comes to cost.