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Supercharger Flutter

 
Old 01-09-2017, 03:44 AM
  #11  
 
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Mine also makes this noise when releasing the throttle after WOT. It's identical to the noise @ 5:04 on this
.
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Old 01-09-2017, 03:56 AM
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Mine has never done that flutter, it just wooshes when i let off or on part throttle??
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Old 01-09-2017, 04:24 AM
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Maybe its okay but i know generally you don't want flutter on a supercharger. I'm no expert on supercharger design but i do know that having a correctly sized bypass valve is essential to remove any strain on the supercharger and belt system.

When i had the HKS pipework i don't remember having any flutter with the kit. I didn't keep it standard for long as i wanted the water/meth so changed the pipework quite quickly and fitted my own bypass valve

This what I've read in the past regarding compressor surge

"Compressor surge is a problem that affects all superchargers and develops when the supercharger is creating boost, but the throttle shaft is closed. This condition can occur under deceleration or while shifting between gears, and can cause the car to sputter and chirp. Under surge, the compressor forces air into the closed throttle body until the pressure inside the throttle body is higher than the amount of pressure being created by the supercharger, and the air pops backward through the supercharger. At that point, pressure is released inside the throttle body and the compressor forces air back through the scroll and into the throttle body, which again has nowhere to go, and the process repeats. While surge normally is not highly damaging to the engine it is certainly annoying and can cause damage with time. To eliminate these problems under surge conditions, a bypass valve (sometimes called an anti-surge valve) is used to release the excess pressure. The bypass valve is actuated using intake manifold vaccuum, which opens the vent valve and releases pressure in the air-intake. Air is either released into the atmosphere (blowoff valve) or recirculated back through the supercharger compressor (bypass valve)."
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Old 01-09-2017, 04:30 AM
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Si can you have a word with HKS as to whether flutter is correct on these kits and it seems to be different for some people which to me means something is either wrong or broken?
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Old 01-09-2017, 04:41 AM
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Originally Posted by CynicG View Post
Mine also makes this noise when releasing the throttle after WOT. It's identical to the noise @ 5:04 on this HKS // Arvou Honda vid.
This is exactly what i'm talking about. Would a atmospheric dump valve be any better?

I seem to remember when i spoke to Si about getting one for the kit he told me HKS don't recommend fitting the SSQV........(unless i'm remembering that incorrect, Si please correct me if i'm wrong)
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Old 01-09-2017, 05:15 AM
  #16  
 
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Tial Q50 / R/ QR sorts these problems, 2psi SC spring.

Compressor surge is bad as described by Mark.

Atmosphere dump value help keep AIT lower as you are not recirculating pressurised air (hot).

Last edited by E4RTH WORM JIM; 01-09-2017 at 05:17 AM.
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Old 01-09-2017, 05:17 AM
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so flutter is bad, woosh is best?
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Old 01-09-2017, 05:18 AM
  #18  
 
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Originally Posted by johnckeen View Post
so flutter is bad, woosh is best?
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Old 01-09-2017, 05:23 AM
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so if you got flutter you have a bad BOV?
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Old 01-09-2017, 05:36 AM
  #20  
 
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Or
a vac leak that opens the value
Or
a bad spring or diaphragm in the BOV
Or
too much boost for the chosen BOV
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