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!

 

Anyone!?

 

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.

 

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

 

thats waste gate flutter by the sounds of it mate

 

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.

 

Actuator on its way? Boost solenoid bust? Problem? Or just stop worrying!?

 

if your running 1.5 bar boost then its normal i think,what boost are you running?

 

Hmmm, hasn't done until now and the map was over 3 weeks ago, just seems to have started recently.

 

Errr, don't know mate, don't have a boost guage!

 

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

 

use the search button matey and all will be explained.

 

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

 

Its chucking out 330bhp so i imagine quite high????

 

defo 1.5 bar then mate on vf 28,i would say don't worry mate,i driven a few that churp,sounds quite cool i thought

 

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

 

nice advice Ian +1

 

Done that dude but it isn't clear whether it is genuinely a bad thing - stalling turbine blades - or just something that happens when you wind up a turbo to a high psi.

I will email Bob

 

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

 

I take it that you are referring to the thing between the airbox and the manifold? This is the standard one that came with the car????

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!!

 

no between the airbox and turbo mate he means and id meet Ian and let him listen

 

I am referring to the pipe that passes under the intake manifold, I live not far from Swindon and I am more than happy to have a listen and advise you on the flutter if that would help.

Cheers Iain

 

Oh bolx, i didnt even know there was one

I really need to understand this machine better

 

Will take you up on that if it continues mate

 

No problem mate.

Cheers Iain

 

If the flutter happens when you back off do you have a dump valve fitted or is the DV port blanked off?

Cheers Iain

 

He has standard DV

 

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

 

Can you please confirm that the noise is happening as you accelerate or when you are backing off?

Cheers Iain

 

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