by phil4 » Sun Feb 03, 2019 8:12 pm
Autobackup is right.
Most of the track day noise limits are circa 100 - 105dba, measured from 1m away at ~45 degrees, they ask for 75% revs, but you'll be maxed at about 4500 (before the static limiter kicks in and bounces it around... more noise, so avoid that!).
I tried measuring the same way with the sports on, and it was hitting 120dba.... granted different measuring equipment, and different eyeballs (I've no idea whether they look for the max, or min or whether they generously knock some off).
The stock exhaust is usually just under 100dba, and so works well for tracks. I've only been to a few, but never had any problems with it.
That being said, I much prefer the sports exhaust when driving, I find the stock exhaust very droney... and does my head in. The sports exhaust, much nicer, no drone... and have been to le-mans and back with it twice and no bother with the police or my ears.
So in my world, with the 3.5, I have both... one I have to use for trackdays (Stock), and one I have on the rest of the time (Sports). Luckily it's a 10 minute one man easy job to change - I'm so in awe of how easy Ariel made it to change. You litterly undo the bolts (5 in all), and it just hangs there, ready for you to sort out the nuts/bolts/washers put the spanner down, and then you just lift it off and put it away. New one the reverse. Easier than changing a wheel!
Autobackup is right.
Most of the track day noise limits are circa 100 - 105dba, measured from 1m away at ~45 degrees, they ask for 75% revs, but you'll be maxed at about 4500 (before the static limiter kicks in and bounces it around... more noise, so avoid that!).
I tried measuring the same way with the sports on, and it was hitting 120dba.... granted different measuring equipment, and different eyeballs (I've no idea whether they look for the max, or min or whether they generously knock some off).
The stock exhaust is usually just under 100dba, and so works well for tracks. I've only been to a few, but never had any problems with it.
That being said, I much prefer the sports exhaust when driving, I find the stock exhaust very droney... and does my head in. The sports exhaust, much nicer, no drone... and have been to le-mans and back with it twice and no bother with the police or my ears.
So in my world, with the 3.5, I have both... one I have to use for trackdays (Stock), and one I have on the rest of the time (Sports). Luckily it's a 10 minute one man easy job to change - I'm so in awe of how easy Ariel made it to change. You litterly undo the bolts (5 in all), and it just hangs there, ready for you to sort out the nuts/bolts/washers put the spanner down, and then you just lift it off and put it away. New one the reverse. Easier than changing a wheel!