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Discussion Starter #1
Ever been done? If not why not? 2 fans of different characteristics. One spools quick other spools slowly? Spool rate matched cuts fast spool to match other.

Thoughts?
 

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Compound charging is big in the diesel world if you want a torque monster and has beenaround for years. Look for Mike Ryan's Pikes Peak truck on YouTube. Land Rover TDV6 are sequential in operation. I don't know what sort of response you'd get in the VR38 though.
 

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Discussion Starter #3
Not on about compound charging. Im talking about a single turbo with 2 sets of fans.
 

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Sorry mate, totally misread it then. Sounds complicated when really a turbo is fairly simple.
 

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sounds like it has a much higher moment of inertia and twice the drag of a stock turbine design.

Only way round this would be to selectively decouple one set of fans from the rotating assembly either by a clutch or a one way bearing. Nice idea but in practice introduces massive of potentially mechanically unreliable components into one of the nastier environments - upwards of 1000°C and 1000 rp/second!

Makes more sense to compound turbo, or better yet, the F1 idea of using the turbo to directly drive a motor instead of a wastegate, and maybe store charge to preaccelerate the turbo when needed.
 
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