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Old 05-02-2016, 12:09 PM   #380 (permalink)
TopgunZ
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Quote:
Originally Posted by EVOHUNTER View Post
im still trying to combat this flutter.

Im kinda stumped, Does the spring need to be a lot stiffer to stop the flutter, or does it have to be a lighter spring to allow it to stay opened.
The tighter the spring, the more flutter you will get. You basically just want enough spring pressure so that it stays shut on boost. The lightest spring will have the least amount of resistance to vacuum therefore getting pulled up and away from the pipe.

You get flutter when you are part throttle right? That's because you are going from 18in/hg of vac to say 5. The spring pushes down towards the pipe but the sc is still blowing air out of it at 5in/hg. So it pushes then pulls then pushes etc....

I had the lightest spring in my Turbosmart dual port and still trimmed it down by like 1 and a half coils. It worked perfect. Problem was that it cant purge enough air when you let off the throttle at 7K. It can flow maybe 300cfm when it should be blowing out at least double that.

The Tial QRJ is the way to go. It has very minimal flutter but is very loud due to how much air it can let out of the system. Just put a hose from the outlet to inside of the engine bay somewhere and it should be good.
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