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Old 02-23-2011, 10:45 PM   #1
Pi7467mp
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Default 11' sti wastegate flutter?

I have an 11' sti stage 1 from amr which consists of an intake and access port. I'm getting waste gate flutter!! Has anyone figured out a quick fix for this? I saw that avo makes an upgraded actuator. Does anyone have experience wit this? What about an external wg? OTher than the obvious hardware requirements, how difficult is is to control boost? Can you use the stock solenoid? Any input will be appreciated!
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Old 02-25-2011, 01:47 PM   #2
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There is no "waste gate flutter" or "Chatter" Its air passing through your turbo "makeing a fluttering noise" has noting to do with the waste gate.

Wastegate Chatter Myth

There is a common myth in the automotive world about so called "wastegate chatter", a noise created on lifting off the throttle in a turbocharged car. The sound is commonly described as a chipmunk or a rattlesnake and is often stated incorrectly as being a result of the turbo's wastegate closing.
The noise is in fact the air compressed by the turbo passing back through the compressor housing of the turbo after having hit the now closed throttle plate.
A BOV (Blow Off Valve) will usually eliminate this noise, but in some cases, i.e. where the BOV doesn't open fast enough or is setup to only react to high boost, some chatter will remain.
The chatter noise is very noticable on WRC Rally cars, where no BOV is allowed.
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Old 02-25-2011, 01:58 PM   #3
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Are you talking about the chutft, chutft, chutft noise it makes when you are on WOT? Especially around 3-4k full boost? Don't worry about it. It's not wastegate flutter, the noise you are hearing is from the intake.
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Old 02-25-2011, 02:01 PM   #4
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It sounds like the solenoids duty cycle is set too high and it's not able to keep the wastegate shut so it's "flapping" for lack of a better word open and closed. It's not when I let off it when my car is trying to hit peak boost. Both partial and full throttle. "ffftt ffftt ffftt fttt"
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Old 02-25-2011, 02:03 PM   #5
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Also why would the intake be making this noise?

In coming from a 1000hp supra with a 60mm external WG so this tiny Subaru stuff is relatively new to me.
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Old 02-25-2011, 02:09 PM   #6
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Log your car. If the performance matches your tune, you are good. If it does not match your tune, it aint tuned right. Simple.

Stop trying to analyse your car like your girlfriend.
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Old 02-25-2011, 02:11 PM   #7
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Quote:
Originally Posted by WreaKLoosE
There is no "waste gate flutter" or "Chatter" Its air passing through your turbo "makeing a fluttering noise" has noting to do with the waste gate.

Wastegate Chatter Myth

There is a common myth in the automotive world about so called "wastegate chatter", a noise created on lifting off the throttle in a turbocharged car. The sound is commonly described as a chipmunk or a rattlesnake and is often stated incorrectly as being a result of the turbo's wastegate closing.
The noise is in fact the air compressed by the turbo passing back through the compressor housing of the turbo after having hit the now closed throttle plate.
A BOV (Blow Off Valve) will usually eliminate this noise, but in some cases, i.e. where the BOV doesn't open fast enough or is setup to only react to high boost, some chatter will remain.
The chatter noise is very noticable on WRC Rally cars, where no BOV is allowed.
It's not "chatter" like I said above it's an actual flutter. I know this is like comparing apples to oranges, but on my supra I my WG duty cycle was set to high, my boost solenoid would act to quickly not giving the wastgate a chance to do it's job so it would open and shut repeatedly making a ffffttt ffffftttt fffftttt sound, similar to what I'm hearing. It's not compressor surge which is what you are describing with the chatter, or rattlesnake noise.

AMR told me that the spring in the actuator is weak and when it heats up gets even weaker making lose the ability to hold the WG shut to reach/hold peak boost.
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Old 02-25-2011, 02:45 PM   #8
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dude im having an issue with fluttering in my 07 wrx with a vf 37 and loss of torque, mad loss! so i think my HOA 3 port boost solenoid took a **** when I had a boost leak and I still tried to get on it to diagnose where it was coming from. I also get a whooshing noise when i let go of the gas, you experiencing that? Sure hope its my solenoid cuz its a cheap fix. maybe u can try that too
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Old 02-25-2011, 02:54 PM   #9
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Quote:
Originally Posted by sanjosuby
dude im having an issue with fluttering in my 07 wrx with a vf 37 and loss of torque, mad loss! so i think my HOA 3 port boost solenoid took a **** when I had a boost leak and I still tried to get on it to diagnose where it was coming from. I also get a whooshing noise when i let go of the gas, you experiencing that? Sure hope its my solenoid cuz its a cheap fix. maybe u can try that too
I doubt it's my solenoid. My car only has 400mi on it, I got it in December! I think that AMR might be on to something. I think im going to buy an adjustable actuator and see if that cures it. I'm trying to stay as close "stock" as possible. AVO turboworld makes an adjustable actuator for a vf48..
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Old 02-25-2011, 03:06 PM   #10
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Quote:
Originally Posted by Pi7467mp View Post
I doubt it's my solenoid. My car only has 400mi on it, I got it in December! I think that AMR might be on to something. I think im going to buy an adjustable actuator and see if that cures it. I'm trying to stay as close "stock" as possible. AVO turboworld makes an adjustable actuator for a vf48..
If its the noise i'm thinking of its not your wastegate. Its your stock bcs and its related to elevation. Drive to a lower elevation and it'll go away. My car did what you're describing with the stock turbo and stg 2.
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Old 02-25-2011, 03:13 PM   #11
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I have a 2011 Forester XT and its making the same noise. I took it to the dealer and test drove another car (same model) and the noise was still there. Mechanic said its normal. Never heard it on my WRX... Normal... I dont know.
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Old 02-25-2011, 03:34 PM   #12
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Quote:
Originally Posted by sanjosuby
dude im having an issue with fluttering in my 07 wrx with a vf 37 and loss of torque, mad loss! so i think my HOA 3 port boost solenoid took a **** when I had a boost leak and I still tried to get on it to diagnose where it was coming from. I also get a whooshing noise when i let go of the gas, you experiencing that? Sure hope its my solenoid cuz its a cheap fix. maybe u can try that too
I doubt it's my solenoid. My car only has 400mi on it, I got it in December! I think that AMR might be on to something. I think im going to buy an adjustable actuator and see if that cures it. I'm trying to stay as close "stock" as possible. AVO turboworld makes an adjustable actuator for a vf48..
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Old 02-25-2011, 04:32 PM   #13
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Quote:
Originally Posted by Edge0fSanity

If its the noise i'm thinking of its not your wastegate. Its your stock bcs and its related to elevation. Drive to a lower elevation and it'll go away. My car did what you're describing with the stock turbo and stg 2.
I would try that but I live in Colorado, my elevation is 5100' and I'm not in the mountains. I would have to go out of state to drop in elevation. Doesn't the atmospheric pressure sensor make up, o a certain extent, altitude changes?
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Old 02-25-2011, 05:41 PM   #14
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Quote:
Originally Posted by Pi7467mp View Post
I would try that but I live in Colorado, my elevation is 5100' and I'm not in the mountains. I would have to go out of state to drop in elevation. Doesn't the atmospheric pressure sensor make up, o a certain extent, altitude changes?
That sensor won't affect the noise you're having issues with. I live at 10k ft and i had to get out of colorado before the noise went away entirely. An aftermarket ebcs with a pro tune should get rid of the noise. It did for me but i'm also no longer on the stock turbo. Out of curiosity can you make a recording of the noise your hearing or find something similar on youtube?
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Old 02-26-2011, 01:19 PM   #15
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Quote:
Originally Posted by Pi7467mp View Post
Also why would the intake be making this noise?

In coming from a 1000hp supra with a 60mm external WG so this tiny Subaru stuff is relatively new to me.
The intake is not making the noise. You are able to hear it now because of the intake.
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Old 02-26-2011, 05:11 PM   #16
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What I'm hearing isn't normal.. I shouldnt hear a flutter at all regardless. The wastegate should either be open or closed. I'm 99% sure it's the wastegate.
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Old 02-26-2011, 07:23 PM   #17
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i get that fluttering noise as well sometimes. im stage 2 with a vf52 swap. it seems to happen more now than when i had the stock td04 turbo at stage 2. im not worried about it.all my accessport data readings are good.
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Old 02-26-2011, 07:38 PM   #18
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Quote:
Originally Posted by Pi7467mp View Post
I have an 11' sti stage 1 from amr which consists of an intake and access port. I'm getting waste gate flutter!! Has anyone figured out a quick fix for this? I saw that avo makes an upgraded actuator. Does anyone have experience wit this? What about an external wg? OTher than the obvious hardware requirements, how difficult is is to control boost? Can you use the stock solenoid? Any input will be appreciated!
I hear what you hear. My Stg2 WRX with an AEM CAI makes the sound you describe. Enjoy it. It's normal.
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Old 02-26-2011, 08:59 PM   #19
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Mine did that after I did the Perrin TMIC. Boost held steady and all was well on the logs. Even after a tune and 3-port if was there. I think the wastegate just doesn't have enough behind it to stay 100% shut at higher boost/load levels.

EWG fixed it.
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Old 07-20-2011, 08:59 PM   #20
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I've got an annoying whistle sound coming from under the hood, over on the passenger side. It's not extremely loud, sounds high pitched and raspy, and it isn't constant. The noise is most pronounced when the engine is under some load and maybe in the 70-90% throttle range. Best example is moderate acceleration on a slight incline. http://youtu.be/zFHFcYpuPrk http://youtu.be/zFHFcYpuPrk
Is that what you have?
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Old 07-20-2011, 10:31 PM   #21
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dude yea my subie does the same thing...... it sounds like a fluttering on like half throttle but it doesnt exist under wot. I was worried the first time I heard it too but also I was with my tuner the first time I heard it and he said dont worry about it its normal. My engine is fully built with ~8k on it now and still on the vf39 which I was running for break in and still have yet to go rotated lol but it will be soon but yea I tuned mine in @ ~23 psi and wot is perfect and very strong but like a half throttle pull which would generate ~10 to 14 psi will make this chattering noise REAL bad lol, so I just usually keep it under 10 psi or wot.

Ive pondered myself what it could be which I still havnt figured it out. At first I thought that it may have something to do with spool versus unequal header runner lengths, but Ive seen alot of subies with rotated setups and large stock location turbos and with their tunes, they dont do this. Idk someone who knows should shed some light on this situation.
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Old 07-29-2011, 06:43 PM   #22
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Yes, it is the wastegate. When the wastegate is opening it makes the noise and I thing the solution will be external wastegate. But the mechanic said its normal.
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Old 11-08-2011, 02:57 AM   #23
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i'm having the same problem so i captured this video. its tough to hear but around 7sec is WOT in 3rd and 10seconds is a WOT in 4th gear.


normal?
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Old 04-14-2012, 11:54 PM   #24
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The original noise mentioned after installing an intake (coughing/grinding sound) when giving it a bit of gas and then immediately letting off the gas pedal is the wastegate.

This sound drove me nuts and I discovered a fix for it on accident while setting I-mode up to run on 0% wastegate duty only. Essentially, I zero'd out all wastegate at and under the 300 requested torque column and the noise was gone.

This weekend I installed a 3port BCS and it's back. I'm pretty sure there isn't much I can do about it without putting the stock BCS back in.
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Old 04-15-2012, 09:50 PM   #25
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Quote:
Originally Posted by 424wrx View Post
i get that fluttering noise as well sometimes. im stage 2 with a vf52 swap. it seems to happen more now than when i had the stock td04 turbo at stage 2. im not worried about it.all my accessport data readings are good.
Mine doesn't do that and I have a similar swap like yours
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