991.2 GT3 transmission noise
05-14-2018, 11:22 AM
#16
Drifting
Been a few months now... and still no video or audio clip of this noise.
05-14-2018, 12:42 PM
#18
Rennlist Member
05-14-2018, 01:02 PM
#19
Drifting
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.
01-19-2019, 02:25 AM
#20
1st Gear
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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!
01-19-2019, 03:35 PM
#22
Rennlist Member
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 ...
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 ...
01-19-2019, 06:22 PM
#24
Rennlist Member
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.
01-19-2019, 10:04 PM
#26
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”.
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”.
01-19-2019, 10:41 PM
#27
Rennlist Member
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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Larry Cable (10-02-2022)
10-02-2022, 04:31 PM
#28
Rennlist Member
I'm a few hundred miles into my new-to-me 2018 GT3 6speed. Feeling a little bit of clunking through the shifter when I transition from no gas to light gas. And a few noises during shifting that sound "unique". I'll listen and test more closely based on the feedback by others in this thread. Hoping it's nothing, obviously. Might take it to my indy or to Sharkwerks for an initial assessment. BBi did a PPI on it and gave it a clean bill of health. Not sure if that included a road test or not.
10-02-2022, 05:00 PM
#29
Rennlist Member
I'm a few hundred miles into my new-to-me 2018 GT3 6speed. Feeling a little bit of clunking through the shifter when I transition from no gas to light gas. And a few noises during shifting that sound "unique". I'll listen and test more closely based on the feedback by others in this thread. Hoping it's nothing, obviously. Might take it to my indy or to Sharkwerks for an initial assessment. BBi did a PPI on it and gave it a clean bill of health. Not sure if that included a road test or not.