pdk chunking

[C2SNerves]

has anyone experienced a chunking sound on high gears with the pdk?

when you are on a high gear (higher than what you should be on, like on 3 to 4 going 40mph)and you release the pedal suddenly, there is a mild chunk in the gears. Then when you press the pedal suddenly again you get the same chunking.

the dealer said it is normal to have such sounds on high gears just as a manual gearbox.

comments pls.

[RFM]

Sounds plausible to me, however, a second opinion does no harm.

[tekky]

Sounds plausible to me, however, a second opinion does no harm.

Just tried this on my 997-1 and I hear it but not loud enough to bother me. is the gearbox the same on a manual 997-1 VS 997-2 ?

[Loren]

Sounds plausible to me, however, a second opinion does no harm.

Just tried this on my 997-1 and I hear it but not loud enough to bother me. is the gearbox the same on a manual 997-1 VS 997-2 ?

997-1 is a Tiptronic -- 997-2 is PDK. Very different beasts.

[MWS]

I have about 9000 miles on my '09 C4S with PDK. I have noticed somewhat rough and noisy PDK downshifting when driving at rather low speeds in Sport-Plus mode. I think the transmission wants to keep the engine revs at 4000 or higher for the given gear you are driving in. If you slow down more it will downshift. If when it tries to downshift you are simultaneously starting to accelerate you may notice the rough shift or "Chunking" that you describe.

I think this is situational and not indicative of a pending failure or inadequacy of the PDK. Remember this is a high performance transmission. In Sport-Plus mode it anticipates aggressive driving. When you start to drive it at lower speeds or start to slow down, it must decide what is your next intent in acceleration. Are you going to speed up or continue to slow down? Sometimes it is correct, but sometimes it anticipates incorrectly and you get the "Chunking."

If this is a constant and recurring problem then maybe you have a worrisome concern. If you can isolate the occurrence to only certain situations then maybe it is more of an inadequacy of the transmission computer programming.

Just my two-cents.

MWS