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A14force wrote:
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blownb310 wrote:
Nice work Bart! 
I will try to make mine fit under the hood of my car. Not sure I can do it. Does your blower create that great whining sound when revved up? What % overdrive with the pulleys are you using?
My blower does not make as much whining noise as you would think (or as I would like). This is mostly because of my drive pulleys. The toyota s/c units use a pully like a a/c units one. the real big angry whine that Jimmy huffers produce is mostly the sound of the big toothed belts forcing the air out of the pulley teeth as it is pulled around. because of the cheap air cleaner ther is quite an induction howl, but not really a whine as such. the ratio of my drive pulleys is 1:1. I figured that thid would be a good starting point. Feral posted a formula regarding ratios etc a while back. According to it my set up should make 16.7 psi????? This is really more that the blower is meant to create safely. It makes a bit over 11 at the moment, but my boost guage is a bit iffy, and I keep running out of road/traction. I know a guy who is running a 4AGZE which has pulleys that are suposed to make 18psi, and his blower is smaller than mine.
You blower should be easyer than mine to conceal as it is longer. Mine is a short unit,so I had to mount it forward more to get the pulleys to line up.
remember, a blower will produce more boost on a smaller engine if driven the same on a lower boosting larger engine.
say you use a 50% overdrive on a 3.8L commodore. the engine might only see 4psi boost and the SC be spinning at 9000rpm internally.
if you used the same pulleys on an A14 for example, so the SC was still spinning at 9000rpm internally, you might end up seeing 12psi of boost.
this is due to the engine's ability to inhale the +ve pressure. the 3.8L V6 can inhale more air, therefore consume more of the available manifold pressure - so it might end up being only 4psi or so above ambient.
the little A14 might consume a third of that available air, so would theorectically triple the manifold pressure - or 12psi.
each system is a little different though, and it depends on plenum sizes, inlet piping lengths, intercooler sizes, cam profiles etc etc but that's the (very) basic principle behind it.
just remember to keep the SC series 'chargers under 11,000 rpm internally. they'll last a long time, and won't de-laminate the rotors.
Transfer
