fluttering sound

[Hurdy]

It does sound like you have a problem.

275whp is low for a K04 conversion on a standard GTI. A standard GTI has a slightly higher compression ratio than the ED30 does and so should mean that you would see a higher figure than an ED30 with the K04 fitted. Most ED30's with a simple remap will be making over 280whp.

Is the "fluttering" noise occurring when on full accelleration or when lifting off between 3500 and 4500rpm?
If it is happening when you lift off then it is something that most remapped cars with a HPFP and forge DV will do. It is even louder with a Garrett GT28 turbo fitted.

You shouldn't have any fluttering noise under accelleration though.

I tend to agree with Gaz and think you need to look at having a custom remap, rather than a generic one as fuelling maybe out.

[wps]

It does sound like you have a problem.

275whp is low for a K04 conversion on a standard GTI. A standard GTI has a slightly higher compression ratio than the ED30 does and so should mean that you would see a higher figure than an ED30 with the K04 fitted. Most ED30's with a simple remap will be making over 280whp.

Is the "fluttering" noise occurring when on full accelleration or when lifting off between 3500 and 4500rpm?
If it is happening when you lift off then it is something that most remapped cars with a HPFP and forge DV will do. It is even louder with a Garrett GT28 turbo fitted.

You shouldn't have any fluttering noise under accelleration though.

I tend to agree with Gaz and think you need to look at having a custom remap, rather than a generic one as fuelling maybe out.

thank hurdy,
the fluttering noise (sounds like zzzccchttt, like turbo is choking. seems like not enough fueling but i'm already running an autetech FP so that should not be the problem) is like when i floor the throttle from 3k rpm onwards and when it hits 3.5k it will start having this sound as the rev increases to 4k and after 4.5k rpm, it climbs very smoothly. its between 3.5 to 4k rpm when the rpm isn't moving up smoothly. can see the turbo boost meter not holding steadily. the boost is fluctuating between 1.5 to 1.6 bar.
too bad, nobody knows who to do a custom remap in my area.

[No Golf Clubs at all]

evap solenoid?

My 05 (55), dsg was intermittently "choking", sticking revs, lacking occasional boost, I described as a flat spot to the dealer, they replaced the evap solenoid (whatever that is) and I have smooth power delivery no hesitancy at all revs.  I would also experience a high pitched electrical whine after a run, with the keys out of the ignition and the car parked up...ok I given the complex nature of this post my coat's on a shoogley peg here however It just a suggestion....I admit I speak with NO technical authority, just seems a similar issue to that you are describing.  I can only imagine that my stealer noticed some error codes to point them in this direction. 

This was in an earlier post, hope it helps in someway...put your bullets away techies, I'm just trying to be helpful 

http://www.youtube.com/watch?v=lc40BEYgPQM&feature=related

http://www.golfgtiforum.co.uk/index.php?topic=89662.0

[Teutonic_Tamer]

The fluttering sound is probably due to the turbo stalling (not good)

Huh - how could the turbo stall with engine rpms at 3½k? 

and I would check the dump valve (not sure of correct terminology on the mk 5) is operating properly under the increased boost pressure. I had a similar problem in my old LCR, when we were trying to set up the Forge split-R valve.
If the dump valve fitted is aftermarket then the problem will probably lie elsewhere.
Of course I might be completely wrong, but its worth a quick check.

But the Mk5 don't use a "dump" valve (ie, one which vents excess boost to the atmosphere, which are well known to cause the turbo to rapidly drop off spool speed).  The Mk5 use a recirculating valve, now correctly termed "cut-off valve", which would allow the turbo to spin at full speed, but simply divert excess boost back to the low pressure side of the turbo.  On the standard GTI (KKK03 ), this is done directly on the turbo housing, whereas on the Ed30/LCR/S3 KKK04 turbo with the remote "DV", the excess is sent back into the airbox - which I think the OP is still using.  So like I said, the turbo itself shouldn't be stalling.

Maybe the actuall DV itself is fluttering, and over cycling?

[Teutonic_Tamer]

Is the APR map the HPFP specific map, if not the map you have may not be requesting the fuel to go with the extra boost in the midrange, could be talking out of my @rse

Could be, but that wouldn't really account for the fluttering sound!  That would be more "felt" rather than "heard".

[Teutonic_Tamer]

It does sound like you have a problem.

275whp is low for a K04 conversion on a standard GTI. A standard GTI has a slightly higher compression ratio than the ED30 does and so should mean that you would see a higher figure than an ED30 with the K04 fitted. Most ED30's with a simple remap will be making over 280whp.

Hmmmm - are you sure?  Manufacturers figures are quoted as power at the flywheel, and are extremely accurate.  VAG use a very accurate DIN testing standard!  So anybody who states that a standard GTI is making 200whp, or standard Ed30 are making 230whp are talking BS.  A standard GTI makes 200bhp at the flywheel, and the Ed30 is 230 flywheel.  Roadwheel horsepower will be noticeably less, and is NEVER used by manufacturers.

It is for this very reason why wheel driven, or hub driven dynos can never be deemed accurate, because there is no way they can know exactly what the specific transmission losses are!  Hub/wheel dynos are only good for making comparisons, and not for making factual claims.

I agree he has a problem though!

[Hurdy]

It does sound like you have a problem.

275whp is low for a K04 conversion on a standard GTI. A standard GTI has a slightly higher compression ratio than the ED30 does and so should mean that you would see a higher figure than an ED30 with the K04 fitted. Most ED30's with a simple remap will be making over 280whp.

Hmmmm - are you sure?  Manufacturers figures are quoted as power at the flywheel, and are extremely accurate.  VAG use a very accurate DIN testing standard!  So anybody who states that a standard GTI is making 200whp, or standard Ed30 are making 230whp are talking BS.  A standard GTI makes 200bhp at the flywheel, and the Ed30 is 230 flywheel.  Roadwheel horsepower will be noticeably less, and is NEVER used by manufacturers.

It is for this very reason why wheel driven, or hub driven dynos can never be deemed accurate, because there is no way they can know exactly what the specific transmission losses are!  Hub/wheel dynos are only good for making comparisons, and not for making factual claims.

I agree he has a problem though!

Yes, I'm sure TT, Ask Vtec abuser (Ben). The Awesome RR printouts show both BHP and WHP.

I can see what you have picked up on though. I was talking about the Standard GTI in the OP that has 275whp (with a K04 and remap) and not a standard GTI with a K04 and no remap.

[vRStu]

I know of somone else who has a similar setup albeit with REVO software and has suffered some turbo stalling that sounds similar to what you are experiencing.

The turbo can stall when it is too efficient and creates more boost that is being requested.

I would suspect that this could be mapped out.

[Teutonic_Tamer]

It does sound like you have a problem.

275whp is low for a K04 conversion on a standard GTI. A standard GTI has a slightly higher compression ratio than the ED30 does and so should mean that you would see a higher figure than an ED30 with the K04 fitted. Most ED30's with a simple remap will be making over 280whp.

Hmmmm - are you sure?  Manufacturers figures are quoted as power at the flywheel, and are extremely accurate.  VAG use a very accurate DIN testing standard!  So anybody who states that a standard GTI is making 200whp, or standard Ed30 are making 230whp are talking BS.  A standard GTI makes 200bhp at the flywheel, and the Ed30 is 230 flywheel.  Roadwheel horsepower will be noticeably less, and is NEVER used by manufacturers.

It is for this very reason why wheel driven, or hub driven dynos can never be deemed accurate, because there is no way they can know exactly what the specific transmission losses are!  Hub/wheel dynos are only good for making comparisons, and not for making factual claims.

I agree he has a problem though!

Yes, I'm sure TT, Ask Vtec abuser (Ben). The Awesome RR printouts show both BHP and WHP.

And how, exactly do Awesome measure that?  The ONLY way to measure the true and accurate engine output is on an engine dyno - and I doubt that (a) Awesome actually have an engine dyno, and (b) they would go to the lengths required to completely remove an engine from a car and bolt it too said engine dyno! 

The method Awesome, and all RR operators use, is a basic conversion formula.  Which like I said previously, is fine for making comparisons on the SAME car, for assessing remaps and the like.  However, no rolling road or hub dyno can ever give a true and genuine power/torque output from the flywheel. 

[Teutonic_Tamer]

The turbo can stall when it is too efficient and creates more boost that is being requested.

But the turbo should only stall if either (a) and atmospheric dump valve has been fitted, or (b) the current recirc valve is not working correctly, and allowing the boost pressure to build too high, and effectively "backing-up" the turbo! 

I would suspect that this could be mapped out.

Yup, agreed.