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Old 04-04-2011, 10:40 AM   #1
dwomp24
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Default Flutter..??

First off let me say this is not my car it is the best quality video of the exact same issue i am having to the T.
I drive an 06 sti
Mods: Invida Divorce Catted downpipe. Intake, cobb pro tune(Ptuning in Northern VA tuned it), fuel pump
Issue: I am receiving fludder, I do not believe it is my wastegate and i dont believe it is Compressor surge. Could it be my stock Bypass valve? It all of a sudden started happening. It really starts in 4,5,6 is im at low rpms building boost and mash the throttle "lets say to get around someone one the highway."
Now if im in 1,2,3rd gear and mash the throttle from a optimum rpm range it only hits about 15.5-16psi and my daily is tuned to 17.5-18

The vid is a camed wrx but with the same issue im having.

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Old 04-04-2011, 11:39 AM   #2
KC
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Quote:
Motorsports Forum
The Motorsports forum on NASIOC is for all racing information from beginner amateur to seasoned professional.
You missed. Two of the three forums you posted this same post in have nothing in common with your post.

--kC
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Old 04-04-2011, 01:43 PM   #3
dwomp24
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trying to see if anyone in the racing community is having the same problem, i autocross heavily
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Old 04-04-2011, 06:02 PM   #4
garageGT
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maybe we should have a technical sub-forum under motorsports..there is a lot of good info here and its normal that some subaru owners often ask questions here rather than the generic tech forum.

The problem in the video is the wg blowing open.

PS: Low rpm / high gear driving, along with steep slopes creates massive load. That's how people blow up motors usually, mostly on cold nights. You shouldn't close onto the throttle at low rpm, gradually give more angle until you feel the turbo spool then more throttle if needed..I'm not saying this will fix your problem, in general, this is a bad habit to start with.
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Old 04-04-2011, 06:48 PM   #5
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Make sure all of your lines are secure under the hood. If they are then it is most likely your stock BPV.
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Old 04-04-2011, 08:43 PM   #6
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I'm gonna say bpv. 272 cams and a vf39 is a kinda odd combo, no?
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Old 04-04-2011, 09:00 PM   #7
dwomp24
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Quote:
Originally Posted by rjrutzky View Post
I'm gonna say bpv. 272 cams and a vf39 is a kinda odd combo, no?

lol thanks for the input and yes i think we should have a tech forum under motor sports. As for the video thats just some one with the same problem as me. im not camed, but yes i do have a vf39 in my o6
So yall think its the bpv?
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Old 04-04-2011, 09:40 PM   #8
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Going with what garageGT said about how this sort of driving produces massive amounts of load, could the high load be causing the turbo to spin so fast that it's out of it's effeciency range and just chopping the air as it comes through the intake?
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Old 04-04-2011, 10:17 PM   #9
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Quote:
Originally Posted by dwomp24 View Post
lol thanks for the input and yes i think we should have a tech forum under motor sports. As for the video thats just some one with the same problem as me. im not camed, but yes i do have a vf39 in my o6
So yall think its the bpv?
I missed the fact that it wasn't your car in the video. Don't get your smileys all in a wad
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Old 04-04-2011, 11:16 PM   #10
dwomp24
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Quote:
Originally Posted by MSP608 View Post
Going with what garageGT said about how this sort of driving produces massive amounts of load, could the high load be causing the turbo to spin so fast that it's out of it's effeciency range and just chopping the air as it comes through the intake?
o yea i totally understand but its doing this in 4th 5th and 6th gear.

Quote:
Originally Posted by rjrutzky View Post
I missed the fact that it wasn't your car in the video. Don't get your smileys all in a wad
its all good lol
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Old 04-05-2011, 02:02 AM   #11
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Just go buy a BPV that isn't made of plastic like the OEM one lol. I've got an HKS somethin somethin. Check my profile.
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Old 04-05-2011, 10:03 AM   #12
dwomp24
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06sti is not made of plastic and i want another oem one i guess..
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Old 04-05-2011, 10:08 AM   #13
MSP608
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Quote:
Originally Posted by dwomp24 View Post
o yea i totally understand but its doing this in 4th 5th and 6th gear.
I know, lower gears don't produce as much load as higher gears.

Quote:
Originally Posted by The Database View Post
Just go buy a BPV that isn't made of plastic like the OEM one lol. I've got an HKS somethin somethin. Check my profile.
Are any Subaru bpv's made of plastic? My crushed 04 STi bpv is holding ~25 psi just fine.
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Old 04-05-2011, 11:57 AM   #14
dwomp24
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Are any Subaru bpv's made of plastic? My crushed 04 STi bpv is holding ~25 psi just fine.[/quote]

dont think so.. perhaps the newer models are, idk
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Old 04-05-2011, 12:01 PM   #15
garageGT
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I would borrow one from a friend or put a block off plate for a test drive. Cheaper than buying one just in case it's the WG..
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Old 04-05-2011, 03:29 PM   #16
dwomp24
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Quote:
Originally Posted by garageGT View Post
I would borrow one from a friend or put a block off plate for a test drive. Cheaper than buying one just in case it's the WG..

true im just located 3hrs from anyone i know with a sti lol fail
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Old 04-09-2011, 01:10 PM   #17
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any GD bpv will work, they're all the same. i have one laying around i think. next time you're in the area, give me a shout in fb.

my vote is the wastegate.
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Old 04-09-2011, 02:09 PM   #18
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I have this same issue now on my VF43...I run about 20 psi at WOT. It is only when it hits about 18-19 psi that the sound in the video begins.

Not sure...figured it was wastegate flutter....Thoughts?
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Old 04-11-2011, 06:29 AM   #19
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Originally Posted by MSP608 View Post
Are any Subaru bpv's made of plastic? My crushed 04 STi bpv is holding ~25 psi just fine.
My 2010 WRX comes with a plastic BPV.
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