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I was wondering if anyone has tried this.
It sounds nice
"Start with a 4bt. Take a supercharger from a 3800 Buick, mount that to the intake with about a 20% overdrive, then use a Holset HX30w turbo blowing into that supercharger, and you are going to have more torque that you will know what to do with."
 

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Start with a 4bt. Take a supercharger from a 3800 Buick, mount that to the intake with about a 20% overdrive,
While the idea is awesome, I'm pretty sure that particular supercharger would not work very well. Those engines only made a maximum of 7-10psi of boost @ 4500-5000 rpm, which is almost double what your 4BT will see. It would take at least a 50% overdrive to realize 3-5psi of boost at 1100-1200 rpm, which is about where the turbo starts building boost fast anyway.

While considerably more costly, maybe something like this would work: http://cgi.ebay.com/ebaymotors/B-M-BLOWER-SUPERCHARGER-CHROME-FORD-CHEVY-MOPAR_W0QQitemZ110220876635QQcmdZViewItem?hash=item110220876635

Just a thought! :rasta:
 

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detroit started using the roots style forced induction and did for many years on thier diesels. it has been tried on cummins motors also with very little success. from what ive seen they are very jumpy throttle wise. for your secondary induction system you would benefit from a larger turbo so that you would be pushing volume the HX30 would not be able to keep up. the 3800 blower also would not be pushing enough volume of air for the 4bt without a large 50% or greater reduction pulley.
 
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