crazy wastegate fluttering
10-20-2004 | 10:21 PM
#1
Thread Starter
Registered User
iTrader: (5)
Joined: Jan 2004
Posts: 236
From: East Bay
Car Info: 06 STI, 00 LGT-L
crazy wastegate fluttering
hey everyone, i'm getting some crazy fluttering sounds, even when i'm not at full boost or throttle, right now i just have an axleback on my car, wtf? is it the waste gate or ? any ideas?
it's like ssssssssssss-fu-fu-fu-fu-ss-s-s-suf-uf-fu if you know what i mean lol. I can try to get a video clip of it or something too
it's like ssssssssssss-fu-fu-fu-fu-ss-s-s-suf-uf-fu if you know what i mean lol. I can try to get a video clip of it or something too
10-21-2004 | 03:06 AM
#5
iClub Silver Vendor
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Joined: Mar 2003
Posts: 8,228
From: 631 Railroad Ave. Fairfield, CA
Car Info: A Laptop
here you guys go.... I don't have time to summerize right now... maybe tomorow:
http://forums.nasioc.com/forums/showthread.php?t=425018
http://forums.nasioc.com/forums/showthread.php?t=425018
10-21-2004 | 08:39 AM
#6
the artist formerly known as mcdrama
iTrader: (23)
Joined: Apr 2004
Posts: 6,428
From: Santa Cruz Mountains, CA.
Car Info: WRBP 2015 WRX Premium/CVT
my 04 seems to 'buck' if I let off the gas too soon when im about to shift[4K-5.4K RPM.
Is this waste gate flutter just a noise, or does it actually effect performance?
Is this waste gate flutter just a noise, or does it actually effect performance?
10-21-2004 | 09:07 AM
#7
Registered User
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Joined: Mar 2004
Posts: 258
From: Sunnyvale CA
Car Info: 2004 San Remo Red WRX
Originally Posted by mcdrama
my 04 seems to 'buck' if I let off the gas too soon when im about to shift[4K-5.4K RPM.
Is this waste gate flutter just a noise, or does it actually effect performance?
Is this waste gate flutter just a noise, or does it actually effect performance?
10-21-2004 | 09:47 AM
#8
Registered User
iTrader: (7)
Joined: May 2003
Posts: 552
From: BAIC
Car Info: 03WRX=sold 08STI=newhotness
Originally Posted by percula
hey everyone, i'm getting some crazy fluttering sounds, even when i'm not at full boost or throttle, right now i just have an axleback on my car, wtf? is it the waste gate or ? any ideas?
it's like ssssssssssss-fu-fu-fu-fu-ss-s-s-suf-uf-fu if you know what i mean lol. I can try to get a video clip of it or something too
it's like ssssssssssss-fu-fu-fu-fu-ss-s-s-suf-uf-fu if you know what i mean lol. I can try to get a video clip of it or something too
10-21-2004 | 10:54 AM
#9
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Joined: May 2003
Posts: 3,648
From: SBAIC-South BayArea Impreza Club-Campbell, CA-Thur
Car Info: 2003 PSM STi
Originally Posted by wrxn'sx
if you're somewhat mechanical/technical you can monkey with the little adjustment **** to the wastegate actuator, sometimes that helps.
-Ted
10-21-2004 | 11:08 AM
#10
iClub Silver Vendor
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From: 631 Railroad Ave. Fairfield, CA
Car Info: A Laptop
Originally Posted by vaus
here you guys go.... I don't have time to summerize right now... maybe tomorow:
http://forums.nasioc.com/forums/showthread.php?t=425018
http://forums.nasioc.com/forums/showthread.php?t=425018
Ok guys.... here's the meat of that thread:
Originally Posted by vaus
Allright guys, looking over the problem, I noticed our adjustable WG actuator. Well, I took off the heatshield, popped off the C clip, and tightened (shortened) the arm 4 turns. Popped it back on and went for a drive and there is now significantly less flutter Before the adjustment I heard flutter at most RPM at very low boost. Now I can only hear a quieter hint of it around 4kRPM under 8-10psi. It deffinately sound healthier and spools a bit quicker as well.
Here's the theory behind it if anyone's interested:
When we all put on turbobacks with much less restriction than the stock exhaust, we also removed that backpressure helping the WG to stay closed under lowe boost. By shortening the actuator arm, you're putting a pre-load on the spring and using the preload to hold the WG shut longer. Be careful not to overtighten as this may cause spiking (from personal experience ).
Try it out and let me know if it works.
Thanks
-- Ed
Here's the theory behind it if anyone's interested:
When we all put on turbobacks with much less restriction than the stock exhaust, we also removed that backpressure helping the WG to stay closed under lowe boost. By shortening the actuator arm, you're putting a pre-load on the spring and using the preload to hold the WG shut longer. Be careful not to overtighten as this may cause spiking (from personal experience ).
Try it out and let me know if it works.
Thanks
-- Ed
Here's a pictures:
-- Ed
10-29-2004 | 02:36 PM
#14
Registered User
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Joined: Jun 2004
Posts: 793
From: San Jose CA
Car Info: '09 accord, '14 2 seater chevy
Originally Posted by percula
nice. Hey it worked out great! It might be in my head but my car actually feels smoother now when i accelerate! By the way, I had to turn it 1.25 times over.
How'd you turn it 1 1/4 turns? It's only half turn incrememnts. I'm going to do it this weekend. Since I put on the twindump DP the flutter kills me, sound like the worst case of knock known to man.
10-29-2004 | 04:27 PM
#15
iClub Silver Vendor
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From: 631 Railroad Ave. Fairfield, CA
Car Info: A Laptop
Originally Posted by percula
nice. Hey it worked out great! It might be in my head but my car actually feels smoother now when i accelerate! By the way, I had to turn it 1.25 times over.
-- Ed