Quote:
Originally Posted by bcfromfl
I think this is the mistake...assuming it's entirely due to the BOV. Yes, the BOV can alter the sound, change the RPMs, etc., but I don't think you can address the entire problem from one end. The shop owner who installed my kit races, has lots of experience with superchargers, and, as I mentioned, installs many centrifugal kits on Mustangs. (He has a Viper GTS that makes 3500hp, among his cars.) He believes the issue is mostly with the intake side.
He explained it this way: Picture your s/c compressing 15 cubic feet of air into your manifold, but the engine is cruising, only drawing 5 cubic feet. That extra 10 cubic feet is going to squeeze out the front of the supercharger, and will be modulated by the spinning of the compressor. If you're always drawing against a slight vacuum, you'll moderate that "overpressure," and muffle the sound through a filter.
I hope we can nail down a good fix in this thread.
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Here's what you quoted above from the owner of the shop that built your car:
"It’s the shop owner’s belief that it occurs because the supercharger is creating more pressure than the engine requires when cruising, and the pressure is cavitating out the compressor fan blades out the opening of the intake. He’s calling it a type of “compressor surge.” I’ve got the “hair net” filter on over the opening, and he said that if you could rig up a GoPro camera to look at the filter, you’d see it vibrating in and out when cruising. He feels that the solution would be to put a pancake H&N-type filter on the intake, so that the supercharger is always pulling against a slight vacuum. Or, if there might be an S-curved charge pipe that could fit a larger filter behind the bumper. Just something to create a small amount of vacuum on the intake."
The owner of the shop that built my car told me the exact same thing and suggested exactly what your shop owner suggested. I'll never know now since I blew my motor before we got to that point. And as much fun as I had experimenting with superchargers, I accomplished pretty much what I wanted with my build(s), I'm going with tt's now.