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Old 12-16-2012, 07:10 PM   #12 (permalink)
Boosted Performance
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Quote:
Originally Posted by Mike View Post
not always, maybe the centrifugal ones, but the roots style Stillen that I had on my 350Z had a vacuum operated bypass valve that relieved the pressure on the compressor when not on the gas hard.
Yes, always. In order to have air to recirculate, and relieve the pressure, energy had to be spent on generating the pressure in the first place. This comes from the engine, and is the reson all superchargers have bypass valves, and not blow off valves. If they had BOV's, it would constantly whistle, as it tries to vent the air/pressure being generated by the blower.

To be more specific to the supercharge you are refering to, the Eaton M62. In order for it to make 10psi of boost, spinning at 12,000rpm it needs 42hp. I know these superchargers very well, because I used them on some kits I used to build for a different platform.
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