type s always fluttering

[FrostBite]

my greddy type s always sounds like a flock of seagulls (chhh chhhh chhhhhhh) kind of like a stock 1g bov but 3 times in a row really quickly. i have tried adjusting it all the way lose, all the way tight, middle, everything. it was leaking on the stock ic piping but i got new hard piping on ebay made for a greddy type s which fixed the leaking and i though id get a nice crisp laser sound but its still the flock of seagulls. the only thing i can think of is that the small hose to the top nipple is so short that it barely fits and is pinched, would that cause the fluttering?

 

[spoolup]

without vacuum to assist the BOV it is possible for this to occur, a vacuum line is about $0.15 per foot from NAPA, buy by a few feet and replace it and see if it fixes it, if not your only out $0.60.

here is a short paragraph from the 935 motorsports website a BOV:

Q: How does the Greddy valve work?

A: The Greddy valve has a rubber diaphragm, steel valve and vacuum assisted movement. The boost valve that is normally closed is held shut via spring tension at the top of the valve. A rubber ring at the bottom of the valve flange helps prevent boost leakage. A screw/nut at the top of the bov adjusts the tension of the spring and thus the sealing power of the valve. Normally under boost, the boost pressure on the top nipple helps keep the valve shut along with spring tension against the boost that is underneath the valve. When the throttle plate is closed, your manifold now has vacuum in it while the intercooler pipes are still pressurized. The vacuum, when transmitted to the BOV, helps assist in bringing the valve up, while the escaping boost pressure pushes further to fight its way out. The higher the vacuum level and the higher the boost, the more the valve will move up. Once the boost is evacuated, the spring tension will push the valve shut.

Along with a picture originally from DSMtalk.com (RIP) that shows the Greddy BOV as it opens.

http://www.935motorsports.com/images/greddysopensm.jpg

Start cheap, replace the line.

 

[FrostBite]

yup, the extended line fixed it, its perfect now

 

[spoolup]

its amazing what $1.00 can buy huh. Glad you got it working right