Track Day noise limits - what can I do
Thread Starter
MBWorld Fanatic!
Joined: Jun 2008
Posts: 8,074
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From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Track Day noise limits - what can I do
I'm getting ready for track season coming up, and am at a loss on what to do about these retarded db limits.
Right now, my exhaust is stock. The db limits at most of the tracks out here is in the 89-91db range - some tested on track. Limerock and Watkins Glenn are coming up, and I'd rather not be black flagged. Our cars stock are louder than that - I just don't get how these limits are at all reasonable, but what can you do. AND I just picked up MBH headers/mids (stock exhaust the rest of the way), so I know I'm going to be way way over.
What do you guys do to get by these limits? Turn-down tips to point away from the noise-detection side? Do the valvetronic exhausts work, and can they reduce the noise sufficiently? Old school steel wool stuffed in the tips? Lift off on the track where they measure?
Can I weld in another resonator, or is that just pointless.
I'm reaching for ideas here. Any?
Thanks
Right now, my exhaust is stock. The db limits at most of the tracks out here is in the 89-91db range - some tested on track. Limerock and Watkins Glenn are coming up, and I'd rather not be black flagged. Our cars stock are louder than that - I just don't get how these limits are at all reasonable, but what can you do. AND I just picked up MBH headers/mids (stock exhaust the rest of the way), so I know I'm going to be way way over.
What do you guys do to get by these limits? Turn-down tips to point away from the noise-detection side? Do the valvetronic exhausts work, and can they reduce the noise sufficiently? Old school steel wool stuffed in the tips? Lift off on the track where they measure?
Can I weld in another resonator, or is that just pointless.
I'm reaching for ideas here. Any?
Thanks
Thread Starter
MBWorld Fanatic!
Joined: Jun 2008
Posts: 8,074
Likes: 2,867
From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Thanks for the reply man. If the stock mufflers don't do the job, will the valvetronic be any quieter? I'm not sufficiently knowledgeable to know if the valvetronic mufflers, when the valve is closed, are quieter than the stock cans. Or can be made to be. Thanks.
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Joined: Sep 2014
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From: Suisun City, CA
2009 C63
The valvetronic when closed is basically stock sounding with just a slightly deeper tone. Open is a different story, but at the moment I still have stock manifolds and secondary cats. About to remove the secondaries and hoping I gain some db with that. I keep considering cutouts where the secondaries are now and just go all out halfway down the track. I know Infineon dragway measures at the starting line so halfway I could flip them open and maybe even gain some horses on the top end. Have yet to hear a 63 with open headers basically. I bet it's just raw and awesome.
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Joined: Jul 2011
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From: D.c
2009 Barolo red C63 AMG (SOLD).13' P31 c63 coupe 2012 porsche panamera
The valvetronic when closed is basically stock sounding with just a slightly deeper tone. Open is a different story, but at the moment I still have stock manifolds and secondary cats. About to remove the secondaries and hoping I gain some db with that. I keep considering cutouts where the secondaries are now and just go all out halfway down the track. I know Infineon dragway measures at the starting line so halfway I could flip them open and maybe even gain some horses on the top end. Have yet to hear a 63 with open headers basically. I bet it's just raw and awesome.
Member
Joined: Sep 2014
Posts: 160
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From: Suisun City, CA
2009 C63
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Thread Starter
MBWorld Fanatic!
Joined: Jun 2008
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From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
So you're saying, with the valvetronic exhaust AND LTH mids etc, the car is now quieter than stock with the valves closed? That's the ticket.
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From: eNyCe
Steel Grey Metallic C63!!
When are you planning on doing the install of your LT's? If you have some time, we can meet up and compare the noise level of the different setups. I have 200 cell cats and a xpipe in my setup.
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From: The Great White North
W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, Taycan GTS Sport Turismo, C5 Z06 & IS300 race cars
Every single track that I've driven at in Canada and the US has them, although the rules vary based on their proximity to urban areas and times / days (no open / loud exhausts after 5 PM or before noon on Sundays for example).
MBWorld Fanatic!
Joined: Jan 2013
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From: The Great White North
W204 C63 Coupe, W166 ML350 BlueTEC, 928GT, Taycan GTS Sport Turismo, C5 Z06 & IS300 race cars
I'm getting ready for track season coming up, and am at a loss on what to do about these retarded db limits.
Right now, my exhaust is stock. The db limits at most of the tracks out here is in the 89-91db range - some tested on track. Limerock and Watkins Glenn are coming up, and I'd rather not be black flagged. Our cars stock are louder than that - I just don't get how these limits are at all reasonable, but what can you do. AND I just picked up MBH headers/mids (stock exhaust the rest of the way), so I know I'm going to be way way over.
What do you guys do to get by these limits? Turn-down tips to point away from the noise-detection side? Do the valvetronic exhausts work, and can they reduce the noise sufficiently? Old school steel wool stuffed in the tips? Lift off on the track where they measure?
Can I weld in another resonator, or is that just pointless.
I'm reaching for ideas here. Any?
Thanks
Right now, my exhaust is stock. The db limits at most of the tracks out here is in the 89-91db range - some tested on track. Limerock and Watkins Glenn are coming up, and I'd rather not be black flagged. Our cars stock are louder than that - I just don't get how these limits are at all reasonable, but what can you do. AND I just picked up MBH headers/mids (stock exhaust the rest of the way), so I know I'm going to be way way over.
What do you guys do to get by these limits? Turn-down tips to point away from the noise-detection side? Do the valvetronic exhausts work, and can they reduce the noise sufficiently? Old school steel wool stuffed in the tips? Lift off on the track where they measure?
Can I weld in another resonator, or is that just pointless.
I'm reaching for ideas here. Any?
Thanks
P.S. 91 db does seen excessively low for daytime unless you're runnign on Sunday. That is the evening limit (5 PM - 9 PM) at most tracks around here, but on weekdays during the day it is usually in the neighbourhood of 101 - 103 db.
Last edited by Diabolis; Feb 15, 2015 at 01:35 PM.
