90dB @ Laguna Seca
06-16-2015, 02:36 AM
#61
Instructor
Join Date: Apr 2014
Location: Wisconsin
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Did they move to that place before the race track was built? If not, why they complain? They should pay for what they did.
The only example I could think of is the Narita airport. A family was living in that area before the airport was built. Because of that, the whole airport close during night. That man lives at the end of the runway.
oh, maybe we could have a track day at LS in the evening....with the same sound limit, you know....
The only example I could think of is the Narita airport. A family was living in that area before the airport was built. Because of that, the whole airport close during night. That man lives at the end of the runway.
oh, maybe we could have a track day at LS in the evening....with the same sound limit, you know....
06-16-2015, 03:40 AM
#62
Took my GT3 for its first track day (actually weekend) at LS on Saturday and Sunday. Great PCA GGR event! My car has stock exhaust. The sound limit was 92 dba.
Having read this thread (and others), I was cautious when going by the sound booth (of course I was cautious in general since this was my first outing with a GT3 -- I have driven LS before). My successful, but slow, strategy was to upshift to 4th and hold it at 4-5k rpm until the bridge. This consistently worked, although I would occasionally hold people up until the bridge.
I did try a three lap sound check. My understanding was you go out for three laps, your sound is recorded, and if you exceed the limit you are okay. Well I hit 98.5 dba on my second lap when I went by flat out in 3d gear and was meat balled. Went in and thought I would be let back out. No -- I was done for the session but it did not count against the 3 per day limit.
The last session on Sunday was 30 minutes, so I figured I do a normal 20 minute session and use the last 10 minutes to test the sound limits.
At first I kept it in 4th, but stayed on the left hand side by the sound shack and accelerated. No meat ball.
Finally I went by on the right side in 3d, not flat out, maybe 7k. I really expected the meat ball, but no. I was so surprised that afterwards I spoke to some race officials to make sure the sound booth was still manned? Yes it was.
So I'm confused about how fast you can go by on a 92 dba day. I wouldn't be surprised if atmospherics has something to do with the variability. It was cool (65-75) and light winds.
So, for those with stock exhausts, what have you found to be the limits by the sound shack? Gear, rpm, speed, which side of the raceway?
Having read this thread (and others), I was cautious when going by the sound booth (of course I was cautious in general since this was my first outing with a GT3 -- I have driven LS before). My successful, but slow, strategy was to upshift to 4th and hold it at 4-5k rpm until the bridge. This consistently worked, although I would occasionally hold people up until the bridge.
I did try a three lap sound check. My understanding was you go out for three laps, your sound is recorded, and if you exceed the limit you are okay. Well I hit 98.5 dba on my second lap when I went by flat out in 3d gear and was meat balled. Went in and thought I would be let back out. No -- I was done for the session but it did not count against the 3 per day limit.
The last session on Sunday was 30 minutes, so I figured I do a normal 20 minute session and use the last 10 minutes to test the sound limits.
At first I kept it in 4th, but stayed on the left hand side by the sound shack and accelerated. No meat ball.
Finally I went by on the right side in 3d, not flat out, maybe 7k. I really expected the meat ball, but no. I was so surprised that afterwards I spoke to some race officials to make sure the sound booth was still manned? Yes it was.
So I'm confused about how fast you can go by on a 92 dba day. I wouldn't be surprised if atmospherics has something to do with the variability. It was cool (65-75) and light winds.
So, for those with stock exhausts, what have you found to be the limits by the sound shack? Gear, rpm, speed, which side of the raceway?