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

[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

[Corey_R]

But their kit (at least following to the other thread linked in your thread), does not contain the Turbo-Back Exhaust, Intercooler, or Air Intake components which are required in the upgrade. This means that the cost is not quite as much as the APR Stage 3 kit, but is approaching that (in the USA it appears to be ~$5000 for the AWE kit, including AWE exhaust and intake etc, vs ~$6800 for the full blown APR Stage 3 kit - both not including installation).

[G-rig]

Yeah it's Almost the same cost but hardly as good power as the APR stage 3. If you're gonna do it may as well do it properly as the labor would be about the same.

[REXman]

Another short recording - noise can be heard only in the first part of that video :

Second Recording

GTI-2.flv video by mirsad99 - Photobucket

That sounds terrible. I can hear it.

I have one on order, and if this is what It sounds like all the time, Im cancelling sorry.

PS - Why do some people NOT have it, If its normal? What a crock.

To be honest, I saw an STi MY09 model today, In white. With those pumped guards, and tints.. Maybe a MY11 WRX is what needs to be done after all.

No rattles there. I have OCD so something like that will annoy the **** out of me.

I will be devistated If I spend 50K on FWD car because of "quality" and I end up getting a car that rattles like its pinging its head off every time I am in the mid range, which is probably, all the time.

[G-rig]

I have one on order, and if this is what It sounds like all the time, Im cancelling sorry.

That's a bit extreme isn't it?
I'm sure a WRX would have other issues, like they are pig ugly and a cheap interior.

You could always consider a MK5 GTI or Pirelli, but then you have to keep an eye on the cam follower issue.

Anyway if enough people report it to their service manager and get it noted on their history perhaps VW may do something about it in the future.

[MurphyTheElf]

That sounds terrible. I can hear it.

I have one on order, and if this is what It sounds like all the time, Im cancelling sorry.

PS - Why do some people NOT have it, If its normal? What a crock.

To be honest, I saw an STi MY09 model today, In white. With those pumped guards, and tints.. Maybe a MY11 WRX is what needs to be done after all.

No rattles there. I have OCD so something like that will annoy the **** out of me.

I will be devistated If I spend 50K on FWD car because of "quality" and I end up getting a car that rattles like its pinging its head off every time I am in the mid range, which is probably, all the time.

I don't blame you for the reaction - it annoys the hell out of me too. But if it was a choice between the MY09 WRX and the MK VI GTI as is, I'd still choose the GTI. That god-awful hard plastic interior is not a place I want to spend my time, day in, day out.