Laguna Seca 991 C2S 90db limit tips
#1
Advanced
Thread Starter
Laguna Seca 991 C2S 90db limit tips
Hi,
I'm really looking forward to going to Laguna Seca next weekend, but amidst the excitement I forgot to think about sound levels.
I have a stock 2013 C2S with PSE, and it's a 90db limit event. Has anyone else run there with a similar car and passed the sound limit? Are there any special tricks needed to pass this? I'll definitely keep PSE off, although I believe the PSE valves open automatically after 4000rpm anyway so that won't help.
I've done some forum searching, but most threads are either for GT3 owners or for cars with aftermarket exhausts... really hoping my stock car won't have any issues.
Thanks
I'm really looking forward to going to Laguna Seca next weekend, but amidst the excitement I forgot to think about sound levels.
I have a stock 2013 C2S with PSE, and it's a 90db limit event. Has anyone else run there with a similar car and passed the sound limit? Are there any special tricks needed to pass this? I'll definitely keep PSE off, although I believe the PSE valves open automatically after 4000rpm anyway so that won't help.
I've done some forum searching, but most threads are either for GT3 owners or for cars with aftermarket exhausts... really hoping my stock car won't have any issues.
Thanks
#2
Sorry to say it, but you're not going to pass sound there with PSE, even with it turned off, as the valves open above 3k RPM even with it off. Only option is to lift going up the hill and see if you can beat the meter.
#4
Rennlist Member
I'm with Grunty.
Hammer up that hill, and see what happens. You won't get shut down for ringing the bell, but you don't get a lot of tries.
if for some reason your banging over 90db in a stock Porsche, THEN you can lift your foot out of it on the next lap. But I really don't think you're going to be too loud.
You can get cheater pipes / diaper pipes / bendy pipes - but I'd be real surprised to learn that 90db actually impacts the likes of bone stock modern Porsches.
I'd love to find a place in the north bay with a decibel meter and find out once and for all how many db's mine lets out OT.
And yes, they let the cars roar on Raceday.
My understanding is this 90db ruling is really held in place by a tight knit group of like 11 people from the community. Mind blowing if true.
Hammer up that hill, and see what happens. You won't get shut down for ringing the bell, but you don't get a lot of tries.
if for some reason your banging over 90db in a stock Porsche, THEN you can lift your foot out of it on the next lap. But I really don't think you're going to be too loud.
You can get cheater pipes / diaper pipes / bendy pipes - but I'd be real surprised to learn that 90db actually impacts the likes of bone stock modern Porsches.
I'd love to find a place in the north bay with a decibel meter and find out once and for all how many db's mine lets out OT.
And yes, they let the cars roar on Raceday.
My understanding is this 90db ruling is really held in place by a tight knit group of like 11 people from the community. Mind blowing if true.
#6
There are a certain number of unrestricted days at Laguna, most of which are taken by race organizers. Track rental is much more expensive on those days. Every once in a blue moon one of them comes open and gets snapped up by a track day organizer.
#7
Absolutely not true. Not only is it not a small group, the sound issue itself goes all the way back to when the track was put there.
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#8
OP, you should find out how many strikes your track day organizer allows before you just open throttle it up the hill the first time. Some only give one chance to correct. If that's the case, you don't want to waste that first one and then be worried the rest of the day. Might be smarter to short shift up the hill from the get go.
#9
Instructor
2014 C2S w/PSE
I don't think you're going to have any issues - I had my 2014 C2S w/PSE at Laguna on numerous 90db days without issue, and if for some reason to get flagged for sound, it's not like its 1 and done, go back out and don't accelerate as hard until you're past the sound shack, you're not going to go much slower up the hill and it will not change how much fun you have with your car at the track.
#12
Instructor
I'm convinced it's a roll of the dice - I hear about stock Cayman GTSes getting meatballed every once in a while, but when I ran it in my own Cayman GTS I had no issues with sound. (I know you're asking about a 991.)
If you search you'll see some elaborate solutions, including a GPS-controlled solenoid that closes the PSE as you approach the sound booth. You'll also see a lot of exhaust tips that point the exhaust away from the sound booth.
I agree with the recommendations - run the track and forget about the sound booth unless you get flagged, in which case just letup a bit as you pass that section of track.
If you search you'll see some elaborate solutions, including a GPS-controlled solenoid that closes the PSE as you approach the sound booth. You'll also see a lot of exhaust tips that point the exhaust away from the sound booth.
I agree with the recommendations - run the track and forget about the sound booth unless you get flagged, in which case just letup a bit as you pass that section of track.
#13
Drifting
There may be some valves in the non PSE cars that open up as the RPM rises to allow freer breathing, but according to my SA, the PSE is fully deafeatable.
#14
Drifting
Pay no attention to the aftermarket portion but this is in an enclosed area up close to the exhaust:
https://youtu.be/TQQiz6A-Phg
Make sure and watch to the end when the car is not in a metal building.
https://youtu.be/TQQiz6A-Phg
Make sure and watch to the end when the car is not in a metal building.
#15
Actually, while Monterey County measures and enforces the sound levels, and it does go back a long time, it is pressure from local residents, mostly in Tehama, that continue to oppose higher sound limits resulting in fewer and fewer open sound days, or even 103db days. Come to Sonoma instead.