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Old 04-04-2017, 09:41 PM   #1
4eat05
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Member#: 378421
Join Date: Jan 2014
Location: NC
Vehicle:
2005 Cobb Stg2+ Wrx
Platinum Silver

Default turbo surge/flutter below 5psi?

Hey guys, I just bought an Hks Ssqv from a friend for stupid cheap. Put it on and vacuum pulled the valve open a hair at idle. Did great everywhere else other than idle, so I took the ssqv apart and used a washer to shim the spring to make it stiffer to hold shut during idle (ssqv is backwards from most valves).

Now it never leaks but I get a little surge/flutter when it blows off below 5psi. Quick smooth blow offs at anything above 5psi.

So, is surge/flutter at 5psi or less going to really hurt my turbo?
I'm sure surge at 10+psi is pretty darn bad for the turbo/blades/bearings but kinda feel a quick surge at 5psi or less can't be tooooo bad, can it???

(Please don't tell me I'm dumb for putting a bov on my stage 2 wrx or tell me to recirc....I already know, it was crazy cheap from a friend, takes 5 mins to swap valves and is my favorite sounding valve. Just want opinions on low boost compressor surge)
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Old 04-06-2017, 07:12 PM   #2
hondaeater69
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Member#: 60324
Join Date: Apr 2004
Location: soon to be somewhere else
Vehicle:
1998 RS

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probably fine. there's no spring load adjustment?
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Old 04-15-2017, 11:04 AM   #3
4eat05
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Member#: 378421
Join Date: Jan 2014
Location: NC
Vehicle:
2005 Cobb Stg2+ Wrx
Platinum Silver

Default

no, its non adjustable. Clone of v4 ssqv. I think only v1 had adjustment screw on it.
I did have to shim the spring with a washer so it wouldn't leak at idle.

I'm sure compressor surge at higher psi would absolutely be bad for the turbo, but still a little worried surge at 0-5psi might be bad. Blows off smooth 5-16psi with no surge which I'm happy about.
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Old 04-15-2017, 12:53 PM   #4
andyfloyd
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Join Date: May 2005
Vehicle:
2002 wrx
silver

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youre fine man, a little surge at low shaft speeds is totally fine.
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