Another dumb 991.1 GT3 noise question

[gd]

Hi all,

I will start by saying that I really love my new (to me) 991.1 GT3, I've had it for nearly three months now, it looks amazing and I have enjoyed quite a few 'spirited' weekend drives around the local country lanes. Having come from a 997 turbo it feels (surprisingly) quite a bit quicker, seriously well planted on the road and a lot more special. I am looking forward to a few track days and really opening it up when I am more used to the car. It is immaculate, it came from an OPC with just over 3,000 mies on the clock, a full history and a long warranty, and it feels very new still. It took me six months to find the right one, and I feel lucky to own such an amazing car.

However, one thing is bugging me, I suspect it could be normal but I just don't know these cars well enough. And that is how it sounds at times.

I am not talking about the "nuts and bolts in a can" or cement-mixer sound at idle, I am used to this and understand that this is perfectly normal, and I am comfortable with it too. All a part of it being a race-car, I was told when I bought it.

The noise I am referring to is different. It occurs when the car is moving along under load, and typically when the PDK auto box leaves me in too high a gear with revs too low and I press on the gas pedal to accelerate. It then makes a very noticeable "scraping" sound as it pulls away, which seems to come from the engine or transmission. The noise eventually fades as the revs rise, and disappears fully before it starts to howl. But the best way I can describe it is that it is pitched somewhere between a grinding and a hissing, or a slightly higher pitched version of a very well worn bearing that has failed. But it's not there all of the time, it does fade away and I can also "avoid" it by keeping the revs up and using lower gears, but it's still there occasionally.

I don't recall hearing it in the test drive, but to be honest I was just grinning like an idiot through most of that and trying to make sure that I didn't crash it as I wanted it so much! I first noticed it about a couple of weeks after buying the car, but I think that by then I was starting to notice everything a lot more, so it may have been there all the time.

A friend suggested that this might be due to the single mass flywheel in the 991.1 GT3, and that I should just keep up the revs. Is this right? Or should I take it back to the OPC and risk them looking at me like I am an idiot?

Any thoughts, explanations, recommendations or reassurances will be very welcome

Thanks
Gary

[Porsche911R]

How low a revs?

As imo out of sports mods oem lugs the engine which cannot be good in auto mode.

[gd]

Anything between about 1k and 3k from memory... I think it starts to fade out at about 2.5k.

Doesn't feel like it's completely lugging the engine as there's no judder, but I get your point.

Edited by gd on Sunday 11th August 19:18

[gd]

Anyone else?

[red997]

I think, given your description, I've heard this too.
no idea whats actually causing it !
Doesn't seem detrimental;
using PDK in manual mode helps alleviate the noise (which I tend to do most times)

[cayman-black]

If it is bothering you and rightly so , i would get it checked out at the OPC and see what they have to say.

[throt]

I would cover my arse and get it checked at my OPC.

[HamidQ]

I've got a 2016 RS which I have had from new, its just turned 3 years old. Pretty sure I hear a "scraping" type sound sometimes at low speed until the speed rises. I've not worried about it and have done all kinds of driving in it from track days to school drops and the car has been to the local dealer each year for a service and warranty check/extension. The car runs perfectly (touch wood) but if you are worried, definitely take it to your local OPC (or one you trust) for them to take a look.

[IMI A]

LWFW chatter in PDK? Your old 997 would murder this car in 9 out of 10 situations. Think it’s the noise which is making you think you’re travelling quicker. Run against these at VMAX and track. They’re blue flagged. Even stock turbo with a decent set of shocks faster on track. Sure not as nice to drive on track though but how often do you actually track her?! On a typical wet and leafy give and take UK B road GT3 wouldn’t see which way a turbo went. Happy to post a couple of vids if you’d like to see the performance difference in a straight line and on track.

[Porsche911R]

IMI A said:

Your old 997 would murder this car in 9 out of 10 situations. Think it’s the noise which is making you think you’re travelling quicker. Run against these at VMAX and track. They’re blue flagged. Even stock turbo with a decent set of shocks faster on track. Sure not as nice to drive on track though but how often do you actually track her?! On a typical wet and leafy give and take UK B road GT3 wouldn’t see which way a turbo went. Happy to post a couple of vids if you’d like to see the performance difference in a straight line and on track.

not so sure, the gt3 has better bhp/t

the 4wd does the trick off the line thing, imo a GT3 would be faster than 997 turbo rolling.

my car would easy pull over a 997 turbo in a straight line, but then the .2 engine is mighty and the manual puts a bit more of that bhp to the wheels.

but I am up at 335bhp/t and less losses over a 997 turbo PDK, with not only PDK losses it has 4WD losses and only 309bhp/t anyway.

daft really as a £95k macca makes all cars slow :-)

Edited by Porsche911R on Thursday 15th August 09:25

[IMI A]

Porsche911R said:

IMI A said:

Your old 997 would murder this car in 9 out of 10 situations. Think it’s the noise which is making you think you’re travelling quicker. Run against these at VMAX and track. They’re blue flagged. Even stock turbo with a decent set of shocks faster on track. Sure not as nice to drive on track though but how often do you actually track her?! On a typical wet and leafy give and take UK B road GT3 wouldn’t see which way a turbo went. Happy to post a couple of vids if you’d like to see the performance difference in a straight line and on track.

not so sure, the gt3 has better bhp/t

the 4wd does the trick off the line thing, imo a GT3 would be faster than 997 turbo rolling.

my car would easy pull over a 997 turbo in a straight line, but then the .2 engine is mighty and the manual puts a bit more of that bhp to the wheels.

but I am up at 335bhp/t and less losses over a 997 turbo PDK, with not only PDK losses it has 4WD losses and only 309bhp/t anyway.

daft really as a £95k macca makes all cars slow :-)

Edited by Porsche911R on Thursday 15th August 09:25

997 had 620bhp when this vid was done and running on Vpower. We now get 680bhp on Vpower and 720bhp ish on MS109 race fuel.

https://www.youtube.com/watch?v=Qwqx9DcekWw&ap...

Put a driver like Mr Rance in a completely stock 480bhp manual 997 turbo and you in your GT3 you’d not stand a chance. You’re forgetting torque figures which are simply not comparable the gulf is so huge

I’m not saying 997 turbo a better car by the way as I’d love one but you’re say following me at 70mph on autobahn and we both floor it. I’ve gone mate. I’m 100% you wouldn’t be able to stay in touch with SWMBO in her 991 turbo s cab on road or track either. Happy to organise a demo and vid it

I’ll put a vid up of running against a new 570s last month. Blew its doors off!! Love this pub talk!!

[throt]

Women can't track, buddy .

[IMI A]

throt said:

Women can't track, buddy .

[Porsche911R]

IMI A said:

997 had 620bhp when this vid was done and running on Vpower. We now get 680bhp on Vpower and 720bhp ish on MS109 race fuel.

https://www.youtube.com/watch?v=Qwqx9DcekWw&ap...

Put a driver like Mr Rance in a completely stock 480bhp manual 997 turbo and you in your GT3 you’d not stand a chance. You’re forgetting torque figures which are simply not comparable the gulf is so huge

I’m not saying 997 turbo a better car by the way as I’d love one but you’re say following me at 70mph on autobahn and we both floor it. I’ve gone mate. I’m 100% you wouldn’t be able to stay in touch with SWMBO in her 991 turbo s cab on road or track either. Happy to organise a demo and vid it

I’ll put a vid up of running against a new 570s last month. Blew its doors off!! Love this pub talk!!

I did the 30-130 days back in the day, and yes the 997 tuned turbos were the fastest cars back in the day. but that's TUNED cars !!

a 911 turbo rolling again would not see where a 570S has gone 100-200 is about 5 seconds.

I think you would be shocked at 70mph in a side by side run. put MR Rance in any car in a straight line it makes no odds ;-)
atm we are taking drag racing.

and atm the 570S seem to beat most things, but then the 720's out now and yet again moves the game on !!

it killed the 991.2 turbo and that's after a slower start !

https://www.youtube.com/watch?v=9YOlNJrO5yM

Edited by Porsche911R on Thursday 15th August 11:07

[RDMcG]

Yes - I get it occasionally on my 2016 RS - not sure why but it does not seem to be important.

[cayman-black]

Porsche911R said:

I did the 30-130 days back in the day, and yes the 997 tuned turbos were the fastest cars back in the day. but that's TUNED cars !!

a 911 turbo rolling again would not see where a 570S has gone 100-200 is about 5 seconds.

I think you would be shocked at 70mph in a side by side run. put MR Rance in any car in a straight line it makes no odds ;-)
atm we are taking drag racing.

and atm the 570S seem to beat most things, but then the 720's out now and yet again moves the game on !!

it killed the 991.2 turbo and that's after a slower start !

https://www.youtube.com/watch?v=9YOlNJrO5yM


Bloody hell i would never have thought that a 570S would beat a Turbo S.

Edited by Porsche911R on Thursday 15th August 11:07

[Porsche911R]

cayman-black said:

they beat most things at REAL EVNTS :-)

[IMI A]

Porsche911R said:

IMI A said:

997 had 620bhp when this vid was done and running on Vpower. We now get 680bhp on Vpower and 720bhp ish on MS109 race fuel.

https://www.youtube.com/watch?v=Qwqx9DcekWw&ap...

Put a driver like Mr Rance in a completely stock 480bhp manual 997 turbo and you in your GT3 you’d not stand a chance. You’re forgetting torque figures which are simply not comparable the gulf is so huge

I’m not saying 997 turbo a better car by the way as I’d love one but you’re say following me at 70mph on autobahn and we both floor it. I’ve gone mate. I’m 100% you wouldn’t be able to stay in touch with SWMBO in her 991 turbo s cab on road or track either. Happy to organise a demo and vid it

I’ll put a vid up of running against a new 570s last month. Blew its doors off!! Love this pub talk!!

I did the 30-130 days back in the day, and yes the 997 tuned turbos were the fastest cars back in the day. but that's TUNED cars !!

a 911 turbo rolling again would not see where a 570S has gone 100-200 is about 5 seconds.

I think you would be shocked at 70mph in a side by side run. put MR Rance in any car in a straight line it makes no odds ;-)
atm we are taking drag racing.

and atm the 570S seem to beat most things, but then the 720's out now and yet again moves the game on !!

it killed the 991.2 turbo and that's after a slower start !

https://www.youtube.com/watch?v=9YOlNJrO5yM

Edited by Porsche911R on Thursday 15th August 11:07

997 only has mild bolt ons and unless collector low mile type cars most are mapped nowadays. Porsche leave so much power on the table with these over engineered cars rude not to

Stock manual 997.1 turbo on track with Mr R or stock 991 turbo s cab on track with SWMBO. Your choice buddy the offer is there I'm sure either will oblige and your GT3 won't keep up. If you had PDK I'd put my money on you and your GT3 against the 997 but not in a manual.

570 is 100-200 in smidge under 6 secs as am I but with manual.

720s a freak of a car but try putting that power down on wet and leafy road. Same with sport series. Traction an issue with all that power a 2wd. You should be happy with manual though as its not about lap times

[Porsche911R]

IMI A said:

720s a freak of a car but try putting that power down on wet and leafy road. Same with sport series. Traction an issue with all that power a 2wd. You should be happy with manual though as its not about lap times

manuals no slower ,just harder to drive and get the time hence the fun.

[IMI A]

Porsche911R said:

IMI A said:

720s a freak of a car but try putting that power down on wet and leafy road. Same with sport series. Traction an issue with all that power a 2wd. You should be happy with manual though as its not about lap times

manuals no slower in the hands of someone who can pedal ,just harder to drive and get the time hence the fun.

Fixed that for you