MK6 GTI - Rattle upon acceleration - Resolved via TPI: 2021062/7

[MIRSAD]

Saw a dark blue GTI turn into Oxford St Bulimba and heard the rattle - loud metallic noise - that'd annoy the bejeebus out of me. Wonder if the motor was cold, or if it always does it. Didnt take off hard either. I'd definately be taking it to VW for a fix.

Fortunately, my MkV doesnt make that noise!

I assume it was MkV GTI

[G-rig]

re: MK6 GTI - Rattle upon acceleration - Resolved via TPI: 2021062/7

Yeah no dark blue in MK6 GTI.

[elisiX]

Had my car for 1 day almost and I have noticed the sound immediately.

And what I find funny is that the very first thought I had was - "sweet, sounds like an E46 M3"

Not annoying me as yet and i've not read the whole thread but ill be sure to let you know if it ****s me.

[kennyc]

Had my car for 1 day almost and I have noticed the sound immediately.

And what I find funny is that the very first thought I had was - "sweet, sounds like an E46 M3"

Not annoying me as yet and i've not read the whole thread but ill be sure to let you know if it ****s me.

You get used to it and forget the "noise" pretty quickly.

[G-rig]

re: MK6 GTI - Rattle upon acceleration - Resolved via TPI: 2021062/7

It's almost like a hissing not a rattle?

[elisiX]

Rattle to my ears, and only under acceleration - no bumps.

[paulcito]

2nd that.
Definitely a rattle (like a bead bouncing erratically on ceramic tiles)

Open front passenger window and quickly accelerate from 2K to 3K rpm.
You'll hear the noise from "under the car"

You can't miss it

[Brian]

Sounds like pinging (detonation) to me. Is the engine labouring in a low gear or is it at higher revs (no labouring)

[G-rig]

is it only under full load or all the time on light throttle? or only sometimes?

Edit: just listened to the sound clip on page 14, couldn't hear much besides the indicator.

[WhiteJames]

Hi,
I've had my MK6 GTI for a few days and have noticed a slight rattle when I accelerate hard.
It sounds like the E46 M3 that rattling sound when accelerating hard.
Any idea or anyone have the same issue.....
Could it be that it's still new?
Fred

My 2010 build GTI has this noise when the motor is under load (i.e. going uphills) between 2400rpm-2500rpm.

The noise is a resonating sound that is a by-product of exhuast savenging.

Sounds a bit like a rattle snake waging its tail. Nothing to be concerned about imo. Sort of like the popping & farting sound of the exhaust on gear change. Adds a bit of character to an otherwise clinically refined motor vehicle.

On the positive side: No longer have to look at the tacho to determine when the revs at at 2400rpm-2500rpm.

Cheers.

WJ

[Christopher]

...

On the positive side: No longer have to look at the tacho to determine when the revs at at 2400rpm-2500rpm.

Cheers.

WJ

haha - my exact way of thinking of it.. (and yes, i previously had said i could not hear it, but now, it's there... but meh, doesn't bother me too much).

[G-rig]

Yeah nothing to worry about.

[WhiteJames]

Wikipedia is your friend re: Exhaust Scavenging & Resonance:

http://en.wikipedia.org/wiki/Scavenging_(automotive)

Scavenging is the process of pushing exhausted gas-charge out of the cylinder and drawing in a fresh draught of air ready for the next cycle in automotive usage. This process is essential in having a smooth-running internal combustion engine. Modifying the exhaust system, (i.e. modifying the exhaust gas velocity by changing exhaust tube diameters) can detract from the "ideal" scavenging effects, and reduce fuel efficiency and power if not properly planned out and executed. To increase scavenging potential, the entire path from intake to exhaust(i.e. all powertrain parts) to tailpipe must be tuned in sync with each other. This will ensure that the air flow is never interrupted. The acceleration and deceleration of thus exhaust gas is what will hinder the scavenging potential. For example, fast flowing heads and a tunnel ram intake combined with a badly planned camshaft and exhaust system will cause the air to "slow down" and "speed up" throughout its journey, thus reducing its scavenging potential. So, to increase scavenging potential, the air must maintain a positive linear acceleration curve.

Manifold (automotive) - Wikipedia, the free encyclopedia

When an engine starts its exhaust stroke, the piston moves up the cylinder bore, decreasing the total chamber volume. With the exhaust valve opens, the high pressure exhaust gas escapes into the exhaust manifold or header, creating an exhaust pulse comprising three main parts: The high-pressure head is created by the large pressure difference between the exhaust in the combustion chamber and the atmospheric pressure outside of the exhaust system. As the exhaust gases equalize between the combustion chamber and the atmosphere, the difference in pressure decreases and the exhaust velocity decreases. This forms the medium-pressure body component of the exhaust pulse. The remaining exhaust gas forms the low-pressure tail component. This tail component may initially match ambient atmospheric pressure, but the momentum of the high- and medium- pressure components reduces the pressure in the combustion chamber to a lower-than-atmospheric level. This relatively low pressure helps to extract all the combustion products from the cylinder and induct the intake charge during the overlap period when both intake and exhaust valves are partially open. The effect is known as scavenging. Length, cross-sectional area, and shaping of the exhaust ports and pipeworks influences the degree of scavenging effect, and the engine speed range over which scavenging occurs.

I'd rather some resonance under load at 2400rpm-2500rpm than the drone at highway speeds from an alternative exhuast system.

Cheers
WJ

[shori]

I finally got my car after 6 months 4 days wait, was exrtemely excited to own a VW GTI till i noticed this sound.
I had great expectations from a German built VW, but this is very annoying & some how i cant get this thing out of my head. Otherwise it is an absolute GEM.

[G-rig]

Apparently there is an AWE K04 kit coming for the MK6 GTI for 4k and 1k to fit it, that would solve the rattle.

AWE K04 KIT - VW GTI MKVI Forum / VW Golf MKVI Forum / VW R20 Forum / VW GTI Forum - Golfmk6.com