108Db with bypass on a 991 GT3...
Discussion
Are you running with the exhaust in loud mode?
All GT3's, 996, 997 and 991 are all borderline in static at most circuits with their standard exhausts in quiet mode, with clutch dipped in etc etc So it's no surprise you were struggling with a 991 with bypass fitted. Almost all aftermarket exhaust mods push GT3's over the noise limits at most tracks.
Did you notice a few cars at Oulton running decibel killers? I saw at least 3. This is going to be your only reliable option to allow you to use the bypass system on track and still be able to enjoy the noise on the road.
Jack
All GT3's, 996, 997 and 991 are all borderline in static at most circuits with their standard exhausts in quiet mode, with clutch dipped in etc etc So it's no surprise you were struggling with a 991 with bypass fitted. Almost all aftermarket exhaust mods push GT3's over the noise limits at most tracks.
Did you notice a few cars at Oulton running decibel killers? I saw at least 3. This is going to be your only reliable option to allow you to use the bypass system on track and still be able to enjoy the noise on the road.
Jack
jackwood said:
Looks like you'll need some decibel killers then.
I do agree it's stupid to make track-focused cars that you can't actually use on track.
In the UK, and it's got a bypass..not sure what Porsche could do about that.I do agree it's stupid to make track-focused cars that you can't actually use on track.
Decibel devils or similar will probably get it back to stock sound level. Ish.
I know there are various solutions to reduce the noise on the 997 GT3 but is there a simple solution to reduce the noise without the dramatic looking additional silencers...?
Whilst the 991 GT3 sounds epic when 'you're on it' most people choose a bypass pipe to offer more emotion and noise across a broader Rev range so the noise can be enjoyed more of the time on the road. Unfortunately this is an issue on track days unless you head to the great circuits of Europe!
Whilst the 991 GT3 sounds epic when 'you're on it' most people choose a bypass pipe to offer more emotion and noise across a broader Rev range so the noise can be enjoyed more of the time on the road. Unfortunately this is an issue on track days unless you head to the great circuits of Europe!
This is so depressing. All we hear about on trackdays is noise woes. What has the world come to? I bought a house near Snetterton and guess what? I heard engines sometimes. Unless somone bought a house and then had a racetrack appear nearby these feckers should be told to talk to the hand with their moaning.
Sure I get annoyed with the loud pipe brigage especially on bikes roaring about but FFS that's what racetracks are for. Soon they'll be having speed and economy limits.
And... Relax
good luck with the GT3
Sure I get annoyed with the loud pipe brigage especially on bikes roaring about but FFS that's what racetracks are for. Soon they'll be having speed and economy limits.
And... Relax
good luck with the GT3hondansx said:
Agree, it is depressing. Seems even more incredulous that somewhere like Spa - with all that space - needs noise limits, especially when you consider the local economy is very dependent on the circuit.
I have never seen any car having issues at spa. They are very very tolerant. Didn't even ever test any of my cars and we had proper race cars on the 21st. Like Lambo super trofeos and GT3s going on the straight at full chat. You ought to be okay at Silverstone, Spa and the Nurburgring. Other than that it may be better to simply plan your calendar where possible around the occasional 'noisy' days that some TDOs offer. BookaTrack have an unsilenced Zolder day on the 9th July if you fancy a road trip with a few of the usual suspects or an unsilenced Donington day on the 6th October closer to home.
This was one of the expected problems that several of us predicted when hearing of the 9000rpm red line when the car was announced (at the time, 997s with 500 fewer revs to play with were starting to see noise abatement issues at some venues). I suspect that the issue has only come to the fore now as more of them are starting to find homes with second owners who are more interested in tracking them - as I mentioned at the RS day at Oulton: that was the most 991 GT3s that I had seen in the same place at the same time and the first TD that I had been at where there were more than a couple taking to the circuit. Which is not simply good, but more like excellent
This was one of the expected problems that several of us predicted when hearing of the 9000rpm red line when the car was announced (at the time, 997s with 500 fewer revs to play with were starting to see noise abatement issues at some venues). I suspect that the issue has only come to the fore now as more of them are starting to find homes with second owners who are more interested in tracking them - as I mentioned at the RS day at Oulton: that was the most 991 GT3s that I had seen in the same place at the same time and the first TD that I had been at where there were more than a couple taking to the circuit. Which is not simply good, but more like excellent
Edited by DiscoColin on Friday 27th March 12:04
Perfectly legal to drive up and down all day long outside the track BUT as soon as you go on track you get black flagged. Total nonsense brought about by the nimby brigade.
Really gets my goat this issue. Static tests are completed to allow you on circuit but they bare zero resemblance to drive by noise levels of which you get thrown off. Turbo cars are the perfect example as during static test no boost ( or very little ) and then on track , lots of boost under load. Then you have the ambient wind , temp and humidity to consider. In summary, a complete lottery if your car is close to the limit to start with. Sadly your GT3 in standard form is close to the limit let alone with a bypass !
Decibel killers or some such horrendous protrusion fitted to the rear of the car will work or as others have said , look at europe with their slightly more laissez faire attitude.
Really gets my goat this issue. Static tests are completed to allow you on circuit but they bare zero resemblance to drive by noise levels of which you get thrown off. Turbo cars are the perfect example as during static test no boost ( or very little ) and then on track , lots of boost under load. Then you have the ambient wind , temp and humidity to consider. In summary, a complete lottery if your car is close to the limit to start with. Sadly your GT3 in standard form is close to the limit let alone with a bypass !
Decibel killers or some such horrendous protrusion fitted to the rear of the car will work or as others have said , look at europe with their slightly more laissez faire attitude.
It does seem to be silly that cars aimed at track days are too loud for track days. My standard 997.1 GT3 only scrapes past the static noise test of 101DB at Bedford, but could not use full throttle at 4 places on the track so wont be going there again. Anything less than 105DB drive by is also off limits - if you ignore the noise limits you wont get a refund. This does then limit the track days available to the noisy days and circuits allowed to have higher noise limits. Spa is around 107Bb I believe and hence does not create an issue.
Noisy days in the UK in my experience often attract the "race car testing on a track day" fraternity. Whilst I am happy circulating with 458 GT spec cars on slicks, the speed differential can make these days a lot less enjoyable! A mate of mine with a 458 speciale has to use DB Killers on the standard exhaust at Silverstone with the 105DB limit!
It does seem crazy that many cars aimed at driving enthusiasts are too loud to be used where they can be properly enjoyed!. What we need is to build some more Nurburgring style tracks in Britain's national parks without noise restrictions!
Noisy days in the UK in my experience often attract the "race car testing on a track day" fraternity. Whilst I am happy circulating with 458 GT spec cars on slicks, the speed differential can make these days a lot less enjoyable! A mate of mine with a 458 speciale has to use DB Killers on the standard exhaust at Silverstone with the 105DB limit!
It does seem crazy that many cars aimed at driving enthusiasts are too loud to be used where they can be properly enjoyed!. What we need is to build some more Nurburgring style tracks in Britain's national parks without noise restrictions!
Edited by F40GT346 on Friday 27th March 14:33
5517 said:
How are people doing track days in these cars?
I got chucked off Oulton on the RS day with 3 Black flags for noise and have since found out some who are running std without the bypass are having the same problem.
As I look at the trackday list and the Db limits it looks like I cant use it in many places, Silverstone, Bedford, Donnington, Snetterton, Rockingham all no go tracks.
I had no problems at Anglesey but I guess that because its coastal and the noise can escape.
How are others finding it?
Seeing as you passed the 105 db static test it must have been the 98 db driveby that got you. If you hadn't used full throttle up the hill after knickerbrook, you wouldn't have been black flagged. I got chucked off Oulton on the RS day with 3 Black flags for noise and have since found out some who are running std without the bypass are having the same problem.
As I look at the trackday list and the Db limits it looks like I cant use it in many places, Silverstone, Bedford, Donnington, Snetterton, Rockingham all no go tracks.
I had no problems at Anglesey but I guess that because its coastal and the noise can escape.
How are others finding it?
boxsey said:
Seeing as you passed the 105 db static test it must have been the 98 db driveby that got you. If you hadn't used full throttle up the hill after knickerbrook, you wouldn't have been black flagged.
I passed the static because the 991gt3 doesn't rev higher than 4k in Park.I have no interest in doing track days where I have to consider using less throttle.
That not why im there
5517 said:
Mermaid said:
The track focused car is yet to come - the 991RS. 
Outside of the 3 Oligarchs on here who is ever going to track £250K worth of car?and it will also fail the noise tests like its little brother
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