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991.2 GT3 transmission noise

Old 05-14-2018, 11:22 AM
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Been a few months now... and still no video or audio clip of this noise.
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Old 05-14-2018, 11:42 AM
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the limited driving I had in my manual GT3.2 I experienced none of these sounds. in fact, I was annoyed at how quiet the car was versus prior editions.
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Old 05-14-2018, 12:42 PM
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Originally Posted by FourT6and2 View Post
Been a few months now... and still no video or audio clip of this noise.
it would be tough to capture via audio I think and impossible to capture via video
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Old 05-14-2018, 01:02 PM
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Originally Posted by johnneurauter View Post

it would be tough to capture via audio I think and impossible to capture via video

If the noise is audible to you, a person, it will be audible to a microphone unless it's a "clunk" type of noise that you feel instead of hear. And the OP said he was going to post up a sound clip.

Last edited by FourT6and2; 01-19-2019 at 04:11 AM.
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Old 01-19-2019, 02:25 AM
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Originally Posted by cobrien View Post
OK, managed to drive the car a bit more today and experiment a bit to see if I could figure out where this was coming from and why. I think I've actually got 2 separate but similar-sounding things going on. The first is just basic mechanical noise from the gearbox when shifting, and this lessens as the transmission heats up. I suspect I can hear it more in the GT3 (compared to my former GTS) because of the reduced insulation. It's nowhere near as noisy as a race car, and the sound characteristics are somewhat different, but that's where some of the noise is coming from. I don't believe it indicates there is a problem or issue, it sounds like normal mechanical noise. The second is as gago1101 said intake noise (and if I'm ever in southern Cal I owe you a drink!). Very easy to reproduce, just cruising along off-throttle in any gear and punch the gas (maybe 40%-50% throttle) and I very clearly hear a clunk type of sound from behind me. I would assume both PDK and MT cars would experience this since it's not transmission related. So I'm wondering if this is something others are hearing with 991.2 GT3s? If so great, if not I'll take it in and get it checked. On my car it is *very* noticeable and actually gets irritating at times. No-lift shift may be the way to go just to keep it from closing and reopening. Thanks!
Just acquired a manual 991.2 GT3 in November and have noticed exactly what cobrien describes. Definitely not present in my old 997.1 GT3 or the 991.1 Carrera I still have. Just wondering if this issue has been addressed by Porsche or if it has led to any problems.
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Old 01-19-2019, 01:57 PM
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It is not clear if this is a normal sound or not. Why do you expect porsche to address this before this is determined?
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Old 01-19-2019, 03:35 PM
Larry Cable
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The GT3 generates a lot of mechanical noises and vibrations - its normal... chillax and enjoy before the batteries come along replace it and spoil it all...

We are lucky that it has a dual mass flywheel - if you ever had a single mass you'd think your transmission was a bucket full of bolts ...

The intake noise is also normal, the clunk and sucking noise ... all is good!

I'm surprised no one (that I know of) has (yet) "complained" about the amount of vibration/feedback that comes thru the shifter cables ...
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Old 01-19-2019, 05:29 PM
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I must be one of the lucky ones. Knock on wood. The car has a lot of wonderful noises but not the transmission noise or vibration from the shifter cables
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Old 01-19-2019, 06:22 PM
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Cobrien, curious if you have owned or driven other 991 GT3's? I hear and feel nothing abnormal in the current car (991.2 manual) compared to two .1's I owned. However, I did have a bad gearbox on the 2016 car which made a strange "crunch" sound after a low gear change. Gearbox was replaced with under 100 miles on the car.
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Old 01-19-2019, 08:56 PM
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But but I like the bucket full of bolts noises with the single mass flywheel Larry

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Old 01-19-2019, 10:04 PM
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Funny. I had same reaction and did same thing after getting my first GT3, a 2014 991.1, which I had bought from from out of town dealer... Took it to my local Porsche dealer proudly and to ask service about the noises at idle.

He came out to the where I parked with his head Porsche tech, then both got in. He started it up. A big grin appeared across his face, and he looked up at me standing alongside the driver’s driver’s side, and said, simply, “race car”.
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Old 01-19-2019, 10:41 PM
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I've experienced this "clunk" from the rear of my manual GT3 as well. It occurs about 2/3 of the time when engaging the clutch. It's more of a feel rather than auditory, so I think it wouldn't video very well.
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