[s-cars] UPDATE: Wastegate Flutter? OR Hyperboost BPV Flutter?

[Cody Payne]

Well I tried 2 things to get this resolved:
-1) Reverse the plumbing so that the BPV had the high pressure on the bottom of the piston vs. the side.
	- Result: Flutter still but also was very "chirpy" BOV sounding on shifts
-2) Purchased the Adj. Hyperboost BPV "Upgrade" from Pete at Strat. and changed back plumbing so that high pressure side was pressing on the "side" of the piston
	- Result: Cranked down max preload...no more apparent audible flutter no more BOV like chirping

Problem apparently solved...true test with Boost Gauge install this week.

cp
-----Original Message-----
From: Cody Payne
Sent: Monday, June 30, 2003 9:44 AM
To: 'S-Car-List (E-mail)
Subject: Wastegate Flutter? OR Hyperboost BPV Flutter?


Gents,
	After install of my new 3 BAR software I am noticing slight audible fluttering of what I believe is my wastegate or BPV.  In particular on the highway say in 5th gear and going full throttle around 3K RPMs.  So high boost and high engine load.  I am currently cranked down on the wastegate 10 turns and running a Hyperboost BPV.

My boost gauge comes this week..so really cannot tell if I am loosing boost..but it is audible especially w/ my intake.

Any similar experiences?

I do have a 710N BPV I can throw in there to see if it goes away...

Thx

cp