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Old 04-28-2010, 01:42 PM   #1
dur4ce
Scooby Newbie
 
Member#: 213449
Join Date: Jun 2009
Chapter/Region: MAIC
Location: Kitsap County, WA
Vehicle:
2009 WRX Prem 5-door
WR Blue Mica

Default Help with BPV flutter after fmic install

So last weekend I installed a TurboXS catted downpipe, cai, and fmic on my heretofore stock 2009 WRX engine. Things went well and after a problem with the throttle body inlet popping off under boost everything seemed fine.

Everything except the fact that my bpv does not vent with a single "psh!" sound like other bpv's on an fmic. Instead, when I let off the throttle after building some boost I get a fluttering sound. I think the problem is that my bpv isn't actually venting and instead I'm getting compressor stall/surge. It sounds just like the videos of off boost compressor stall that can be heard on youtube, ect.

Here are some more pieces of relevant info:
1. I have a maddad boost gauge running off a T that is in the bpv vacuum line, about 5" from the valve
2. I've got a wideband o2 sensor and my afr's are running pretty normally, at about 14.2 at idle and cruising.
3. I have NOT leak tested the fmic yet, but I'm fairly confident that there isn't a major leak (all joints secured with t-bolts)
4. I have NOT yet replaced the throttle body inlet with the AVO silicone tb inlet I ordered. Should be delivered tonight.
5. Since the fmic, cai and dp were all installed at once, I can't tell if the flutter was present before the fmic install

My best guess is either the t in the vacuum line isn't a large enough inner diameter to let the BPV see the necessary vacuum to open, or for some reason my bpv is just buggered.

I think the best approach will be to install the tb inlet to make sure I'm not leaving at the tb (unlikely the problem) and fine a straight through hose coupler with a larger inner diameter and replace the T with that to see if the BPV vacuum line is the culprit. After that I don't know what to do except buy a aftermarket BPV (or recirc bov) to replace the stock one. But the stock one should be just fine... Ugh!

I would appreciate any advice that you could give. I just would like to get this taken care of before I really try out the full capabilities of my stage 2 setup.

Thanks!

-Steve
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