Hot!Trackday noise levels 991.1 GTS

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penguinman
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penguinman Guest of the Club
2018/03/22 08:15:53 (permalink)

Trackday noise levels 991.1 GTS

Hello,  I am thinking of changing my 981 Cayman S for a 991.1 3.8 GTS.
Am a bit worried about noise level on track days, thinking mainly of Brands GP circuit.  Does anybody here have experience of using the GTS on track and have you had problems with noise limits either static or drive-by? (Obviously I would not use sports exhaust mode!).    Thank you in advance,
 
 

9 Replies Related Threads

    salisbees
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    salisbees PCGB Member
    Re: Trackday noise levels 991.1 GTS 2018/03/22 19:54:06 (permalink)
    I run a 991.1 Carrera S 3.8 on track days and the issue is not simple. I have had readings from 98db to 101db and there is no discernable reason for the difference but it does help to run slightly higher revs than you are being asked for. The tracks I mainly use are Goodwood and Castle Coombe both of whom are prepared to measure you in advance, if you want to know if you can run. The other solution is to buy a noise meter, which I have and test the car yourself, which I now do with any car I buy.
    Phillip Wright
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    Phillip Wright PCGB Member
    Re: Trackday noise levels 991.1 GTS 2018/03/22 19:59:54 (permalink)
    I ran my 991.1 GTS at Castle Coombe last year and had no problem passing the noise test. Couldn't use the sports exhaust on track though.
    I don't know if Brands has lower noise limits than Castle Coombe.
    ralphmusic
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    ralphmusic PCGB Member
    Re: Trackday noise levels 991.1 GTS 2018/03/22 20:05:54 (permalink)
    Ha!
     
    I run a 981 Cayman S with a tuned 3.8L 991.1 engine and Cargraphics manifolds with 200 cell cats and can't run at Goodwood due to drive-by noise although I am only 102db on static. You probably should be OK with standard manifolds and cats as I was with a previous 997.2 GTS.

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    Tony Warr
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    Tony Warr PCGB Member
    Re: Trackday noise levels 991.1 GTS 2018/03/22 21:50:47 (permalink)
    It is a really great idea to buy one thanks salisbees. 
    Only £14.99 with delivery tomorrow if you order within 2 hours.
    https://www.amazon.co.uk/Meterk-30-130dB-Measuring-Instrument-Monitoring/dp/B075591G4Q/ref=sr_1_4?ie=UTF8&qid=1521754569&sr=8-4&keywords=Sound+Level+Meters
     
    Also, I compare noise levels here:
    https://www.opentrack.co.uk/shop/
    Dave Woodall runs great trackdays and is a top bloke so I suspect he would happily advice too.
     
     
    penguinman
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    penguinman Guest of the Club
    Re: Trackday noise levels 991.1 GTS 2018/03/23 07:42:24 (permalink)
    Thank you all for the replies and advice. Brands are very tight on levels. I do not want to buy the car and then find I cannot use for occasional track days, as it is a big investment for me. I will invest in the meter, but having a lot of experience with various cars at Brands, my subjective feeling is that the GTS would be marginal at least and close to failure, hence my question. I need to measure before buying methinks.
    Thanks again. 
    MistleyMike
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    MistleyMike PCGB Member
    Re: Trackday noise levels 991.1 GTS 2018/03/23 16:37:16 (permalink)
     
    Does this help? - from the Club Track Day page.....
     
    Three of our days this year will be on a Saturday as, despite expressions of support they tend to be less well supported than weekdays. All of our days will be run to a static noise limit of 105dbA, Our evening event at Brands Hatch in May is run to 102dbA, to avoid upsetting the neighbours. This means this event is not suitable for Cayman GT4's and possibly 991 GT3's. Our day at Donington Park in July is run to an unlimited noise level and can accommodate any model with any exhaust.
     
    Reading that, the GTS should be below the limit. 
     
     

    Mike Watson
    penguinman
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    penguinman Guest of the Club
    Re: Trackday noise levels 991.1 GTS 2018/03/23 16:57:07 (permalink)
    Thanks Mike, yes I agree that may be OK for Indy circuit although drive-by is still 92dba.
    It's the GP circuit that I love, and that has static of 101 and same drive by. My GT3 997.1 started failing both on the GP loop and I resorted to blanking off the vacuum servo to the sport exhaust flaps (which on the GT3 sapped torque as it also governed other parameters), and under certain weather conditions (!) it still failed the drive-by. There used to be some latitude, but not now as there is a direct telemetry link to local authority. 
    Please don't think I am criticising your reply, as really helpful, just adding stuff. 
    Tony Warr
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    Tony Warr PCGB Member
    Re: Trackday noise levels 991.1 GTS 2018/03/26 07:51:24 (permalink)
     And I just wondered if any members might carry/use exhaust noise suppressors such as these http://www.decibeldevil.co.uk/ if they have a trackday noise level problem?
     
    Stephen Walker
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    Stephen Walker PCGB Member
    Re: Trackday noise levels 991.1 GTS 2018/06/13 15:33:29 (permalink)
    Hello.
     
    On a recent trackday at Goodwood, with GRRC I was told that the GT4 struggles with noise, which is ironic as it is a track car-ish.
     
    My concern is I am booked into Snetterton on a PCGB trackday, in a couple of weeks, which is 105db and I'd like to take my GT4.
     
    Does anyone have any first hand experience on whether the GT4 will pass the 105dB noise test?
     
    The other option i have is a 991.2 GTS - again, has anyone any experience on passing noise tests with this model (I am assuming it'll pass no problem).
     
    Any first hand knowledge feedback on the above would be greatly appreciated.
     
    SW
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