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Old 03-25-2008, 01:21 PM   #1
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Question there HAS to be a reason this wont work

I've been trying to learn about turbochargers and after seeing a vortech supercharger i came up with a crazy idea since most of my ideas have already been thought of i just thought i'd throw this out and get feedback.
from howstuffworks i found a picture that i cant get to load right now but can be found here http://auto.howstuffworks.com/turbo1.htm my idea was to remove the turbine section of a turbo and just have the compressor section of a turbo with a shaft spinning the compressor powered by the drive belt pretty much exactly like a vortech super charger does...now i know there would be fab work involved making a shaft and mounts and a ton of stuff that way... but i have access to lots of materials and a full machine shop i can access so time and materials aside it would be much cheaper for me to buy a turbocharger and do this instead of buying something like the vortech charger.
alrighty guys let the debating begin why wont this work??? (aside the possible fact that i might just be an idiot)


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Old 03-25-2008, 01:27 PM   #2
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There is....you won't get any appreciable boost with the turbine spinning at drive belt speeds. Once you get done gearing it up to spin fast enough to boost you'll have much more time and energy in it than would be worth it to just buy a supercharger.
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Old 03-25-2008, 01:33 PM   #3
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thats what i was thinking it would be was getting it to spin fast enough to provide boost!
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Old 03-25-2008, 02:13 PM   #4
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So what you're asking for is whether it's feasible to fab your own centrifugal supercharger?

http://en.wikipedia.org/wiki/Centrif...e_supercharger

Just to be clear.
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Old 03-25-2008, 02:44 PM   #5
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yeah basically i guess thats what i'm asking just using turbo parts instead of completely building one
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Old 03-25-2008, 02:49 PM   #6
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the housings are designed completely differently, i'd be surprised if you get more than 5 or 6 pounds of boost out of it

centrifugal SC housings are designed to flow more air at a time at a lower velocity since the serpentine belt cannot spin the shaft that fast without some crazy gearing

Turbo compressor housings and impellers are more designed for high velocity and less volume at a time since the shaft can get really high up there in rpm's
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Old 03-25-2008, 03:10 PM   #7
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5-6 psi though? isnt that getting close to how much an auto tranny can handle anyways? maybe i should have specified I'm not looking for 400hp like tls_bmx i just want to be close to the 200hp mark
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Old 03-25-2008, 03:13 PM   #8
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I was just guessing, for all I know you wont even get 2psi without some serious gearing and by serious I mean like 60:1
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Old 03-25-2008, 05:56 PM   #9
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Is this something that Maximum Boost would give the basic math to figuring out?
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Old 03-25-2008, 06:23 PM   #10
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Quote:
Originally Posted by illinipo View Post
I was just guessing, for all I know you wont even get 2psi without some serious gearing and by serious I mean like 60:1
Uhhh.....
http://www.answers.com/topic/assumption?cat=biz-fin

The PC I had was spinning around 80,000 RPM at redline, which netted 10psi. The compressor wheel is designed to flow a LOT of CFM's at that rate, but even so 80,000 is the low side of turbo flow territory.

PC gearing would be about 11:1, you certainly do NOT need 60:1 gearing to spin a turbo in its efficiency range!!
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