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Old 02-19-2009, 02:41 PM   #1
Mr_Snips
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Default Discussion on a CVT

Does anyone produce yet a CVT (constantly varying transmission) for a supercharger yet?

I could see that easily out classing a turbo if they could make something reliable. Can you imagine the supercharger spinning at its perfect speed all the way through the rpm range?

Has anyone seen one produced for a supercharger yet?
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Old 02-19-2009, 03:45 PM   #2
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This really would only be of benefit to a Centrifugal SC since it needs higher RPMs to make boost.
The roots blower is already great at low RPMs, but struggles as RPM and pressure ratios rise too high.
But... the TwinScrew enjoys the best of both worlds. It can make great boost at lower RPMs, yet still make plenty of boost at higher RPMs too. And unlike the roots, it won't generate gobs of heat as the pressure ratio rises past 2:1.
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Old 02-19-2009, 06:56 PM   #3
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Edit: apparently that is not a transmission

Last edited by IllNastyImpreza; 02-19-2009 at 10:52 PM.
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Old 02-19-2009, 07:47 PM   #4
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^ Dude.. you had better re-read the OP.
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Old 02-19-2009, 10:51 PM   #5
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hey... he said transmission
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Old 02-19-2009, 11:42 PM   #6
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Technically.. yeah.. I know.. your right.. CVT.
But.. ah.. you get the point.
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Old 02-20-2009, 07:27 AM   #7
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transmission is used loosley. you could cal in a variable pulley, i dont care. it was to get the point across if that you could spin the SC at ideal speed no matter where you were in the revrange.
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Old 02-23-2009, 06:49 PM   #8
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there are some dual speed SC units, but not CVT.
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Old 02-24-2009, 12:18 PM   #9
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i have seen a fair amount of variable pulleys. They are all quite large and heavy so it would take a lot of R&D to make it into a workable size.

also the drag a SC would put on an engine if it was spinning at it's target rpm while the car was at idle would probably cause bogging and other unwanted characteristics.
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Old 02-24-2009, 12:43 PM   #10
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Paxton superchargers from the '50s had variable pulley ratios.

Read on - http://images.google.com/imgres?imgu...%3Den%26sa%3DN
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