Failed 90 db limit, badly, at Laguna Seca
#1
Failed 90 db limit, badly, at Laguna Seca
At the last PCA track day at Laguna Seca, I got black flagged several times for sound violations, up to 96 db. All this with a stock exhaust! I thought I'd be fine even with their 90db limit due to the sound attenuation of the turbos. The only power mods on the car are a EVOMS chip, 5 bar FPR, and diverter valves.
I don't know how to go quieter than stock, and lifting past the sound station is a bummer. Any ideas?
I don't know how to go quieter than stock, and lifting past the sound station is a bummer. Any ideas?
#3
Wow, that's horrible! I don't even go to tracks with strict sound limits. My advice is go to another track. Changing exhausts and stuff is for the birds.
There are baffles you can buy though. I think about $100 each that will reduce sound further. They sell them at atlanta Motorsports park.
There are baffles you can buy though. I think about $100 each that will reduce sound further. They sell them at atlanta Motorsports park.
#4
Another track? No way, Seca is the best!
As dj stated above, key is to make extensions pointing away from the db meter. Up shift and if they still complain lift. It does the trick as I have a full 3 inch "X" exhaust with no cats.
As dj stated above, key is to make extensions pointing away from the db meter. Up shift and if they still complain lift. It does the trick as I have a full 3 inch "X" exhaust with no cats.
#7
Road Atlanta 20 min
VIR 5 hrs
Barber 2.5 hrs
I wouldn't bother with a track that was that much trouble to run.
I hear Sonoma is better anyways. Hoping to see for myself this fall.
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#9
The only easy solution is to lift. Otherwise, the posts above about using extensions to point the tips away from the meter is really your only option short of cutting your mufflers open and adding more baffles (not really an option).
+1 to that! How can any stock car/exhaust fail at a track?
+1 to that! How can any stock car/exhaust fail at a track?
#11
There were a couple of other 996 turbos there that day, at least one with an aftermarket exhaust, that were not getting black flagged. The only material difference with mine is the K24 turbos. I'm willing to make the "laguna pipes" but first want to rule out some issue with my exhaust system making it louder than it should be.
#13
Is your car an X50 or regular turbo? I'm assuming since you say K24 it's an X50, which does have a louder exhaust than a regular Turbo.
I would agree, the X50 car definitely has a distinctive (and louder) sound versus a regular Turbo.
I would agree, the X50 car definitely has a distinctive (and louder) sound versus a regular Turbo.
#15
I got black flagged in my first session at LS also even with track tips. The rest of the day I took it easy on the gas pedal after turn 5 and had no problems. On 90db days that is really all you can do.