Turbo Flutter
17 September 2010, 08:16 PM
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Turbo Flutter
Should a standard my00 recirc valve be able to cope with 330bhp? I am getting turbo flutter sometimes which sounds expensive everytime it does it! Are there higher rated recirc valves as I really don't want a dump valve!
17 September 2010, 10:25 PM
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standard recirc can handle quite abit. Have you put an induction kit on as this will make things a bit louder then normal. I think forge do a recirc valve.
Has this flutter got any worse, or have you just started to notice it?
What turbo are you running. As the TD's can handle it.
Has this flutter got any worse, or have you just started to notice it?
What turbo are you running. As the TD's can handle it.
17 September 2010, 10:33 PM
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VF28, recent remap by Bob Rawle, green cotton panel filter. It isn't all the time but on a gradually decreasing throttle i.e. lifting off gradually it "chirps" a lot which i am assuming is flutter.
Or could it be the wastegate? Not a clue i am afraid
Or could it be the wastegate? Not a clue i am afraid
17 September 2010, 10:37 PM
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I dont think you have anything to worry about. Think maybe now you've had it mapped, things have changed. Maybe speak to Bob and see if he knows anything about it, and put your mind at rest.
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17 September 2010, 10:42 PM
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Does it hold boost ok? If so i'd say nothing to worry about. But then you think why is it causing to flutter slightly.
I wouldn't worry to much. But if your still worried get it checked, as over internet hard to tell
I wouldn't worry to much. But if your still worried get it checked, as over internet hard to tell
17 September 2010, 10:43 PM
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Does it hold boost ok? If so i'd say nothing to worry about. But then you think why is it causing to flutter slightly.
I wouldn't worry to much. But if your still worried get it checked, as over internet hard to tell
I wouldn't worry to much. But if your still worried get it checked, as over internet hard to tell
17 September 2010, 10:49 PM
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The turbo flutter you describe sounds like compressor surge, its a state the turbo gets in when the compressor is drawing in more air than the engine can handle, this causes the pressure in the intake (post turbo) to backup against the compressor which slows the compressor down briefly but then the engine catches up again causing the backup to occur again, this all happens very quickly and when you hear it, it sounds like a flutter. This flutter can infact hold your engine back during acceleration in the higher gears, I have found that reducing the intake duct size helps especially if you are using a silicone turbo intake hose. So far I have found a 57mm or 60mm duct (depending on car and mods) just after the MAF seems to be the optimum size of intake duct.
Cheers Iain
Cheers Iain
17 September 2010, 10:52 PM
#17
The turbo flutter you describe sounds like compressor surge, its a state the turbo gets in when the compressor is drawing in more air than the engine can handle, this causes the pressure in the intake (post turbo) to backup against the compressor which slows the compressor down briefly but then the engine catches up again causing the backup to occur again, this all happens very quickly and when you hear it, it sounds like a flutter. This flutter can infact hold your engine back during acceleration in the higher gears, I have found that reducing the intake duct size helps especially if you are using a silicone turbo intake hose. So far I have found a 57mm or 60mm duct (depending on car and mods) just after the MAF seems to be the optimum size of intake duct.
Cheers Iain
Cheers Iain
17 September 2010, 10:53 PM
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Just realised that you are in Swindon mate, if it would lay your mind at rest I would be happy to meet you and advise on what the flutter is and how to rectify it if indeed it need fixing.
Cheers Iain
Cheers Iain
17 September 2010, 10:57 PM
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The turbo flutter you describe sounds like compressor surge, its a state the turbo gets in when the compressor is drawing in more air than the engine can handle, this causes the pressure in the intake (post turbo) to backup against the compressor which slows the compressor down briefly but then the engine catches up again causing the backup to occur again, this all happens very quickly and when you hear it, it sounds like a flutter. This flutter can infact hold your engine back during acceleration in the higher gears, I have found that reducing the intake duct size helps especially if you are using a silicone turbo intake hose. So far I have found a 57mm or 60mm duct (depending on car and mods) just after the MAF seems to be the optimum size of intake duct.
Cheers Iain
Cheers Iain
Thanks Iain that is very kind, if it continues to happen i will take you up on that. It clearly isn't a massive cause for concern yet but if it gets worse i shall give you a shout as can't afford another VF28!!
Last edited by chtpcpo; 17 September 2010 at 10:59 PM.
17 September 2010, 11:01 PM
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Cheers Iain
18 September 2010, 08:57 AM
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Just to close the loop, here is the email conversation that i had with Bob Rawle:
Hi Mark, thats what I had in my records but just to check, so as mentioned not a "problem" in that sense.
best regards
bob
On 18 Sep 2010, at 08:40, Mark Ellis wrote:
Thanks Bob, yes it was worse when it was colder a few days ago and yes it is the standard DV mounted on the front of the IC
Mark
--------------------------------------------------------------------------------
From: Bob Rawle [mailto:rbr@brdevelopments.com]
Sent: 18 September 2010 08:37
To: Mark Ellis
Subject: Re: Booking
Hi, I am away in Portugal mapping at the moment so apologies for the slow reply, what you describe is not waste-gate related, if occurring as you lift off the throttle then this is the sound of air moving back through the turbo to the induction area, it will become louder at colder temperatures since the air is becoming denser. If you lift off quickly then you get a snappier noise if anything ? But easing off produces the "WRC chirp". Remind do you have the std dump valve fitted?
Its not a problem so don't spend money
best regards
bob
On 17 Sep 2010, at 22:52, Mark Ellis wrote:
Hi Bob,
I seem to have a bit of a problem developing. I seem to be getting wastegate flutter which has only come on in the last week or so as it has been getting cooler. Basically on a reducing throttle in any gear there is quite a loud chirping noise that comes from the turbo. Could be boost solenoid? Wastegate actuator? Or normal? Impossible to tell over the internet but maybe something that you have come across before?
Cheers mate
Mark
Hi Mark, thats what I had in my records but just to check, so as mentioned not a "problem" in that sense.
best regards
bob
On 18 Sep 2010, at 08:40, Mark Ellis wrote:
Thanks Bob, yes it was worse when it was colder a few days ago and yes it is the standard DV mounted on the front of the IC
Mark
--------------------------------------------------------------------------------
From: Bob Rawle [mailto:rbr@brdevelopments.com]
Sent: 18 September 2010 08:37
To: Mark Ellis
Subject: Re: Booking
Hi, I am away in Portugal mapping at the moment so apologies for the slow reply, what you describe is not waste-gate related, if occurring as you lift off the throttle then this is the sound of air moving back through the turbo to the induction area, it will become louder at colder temperatures since the air is becoming denser. If you lift off quickly then you get a snappier noise if anything ? But easing off produces the "WRC chirp". Remind do you have the std dump valve fitted?
Its not a problem so don't spend money
best regards
bob
On 17 Sep 2010, at 22:52, Mark Ellis wrote:
Hi Bob,
I seem to have a bit of a problem developing. I seem to be getting wastegate flutter which has only come on in the last week or so as it has been getting cooler. Basically on a reducing throttle in any gear there is quite a loud chirping noise that comes from the turbo. Could be boost solenoid? Wastegate actuator? Or normal? Impossible to tell over the internet but maybe something that you have come across before?
Cheers mate
Mark
18 September 2010, 03:15 PM
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Accelerate deffo, just done a test run. It is worst when you back off from full to half throttle though, doing it all the time now. It was mapped at 28 degrees C which might explain the gradual onset as the weather has cooled