Nissan 370Z Forum  

100DB Track Limit

A new local track requires the noise level to be under 100DB directly behind the car at and 95DB on some corners but with a bit distance. I currently have

Go Back   Nissan 370Z Forum > Nissan 370Z Tech Area > Track / Autocross / Drifting / Dragstrip

Like Tree16Likes
  • 3 Post By gomer_110
  • 1 Post By gomer_110
  • 5 Post By Elmo370z
  • 3 Post By gomer_110
  • 3 Post By gomer_110
  • 1 Post By gomer_110

Reply
 
LinkBack Thread Tools Display Modes
Old 12-18-2018, 01:39 PM   #1 (permalink)
Premium Member
 
Join Date: Nov 2009
Location: Taipei
Posts: 233
Drives: 2012 370z
Rep Power: 3380
andy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond repute
Default 100DB Track Limit

A new local track requires the noise level to be under 100DB directly behind the car at and 95DB on some corners but with a bit distance. I currently have FI LTH and CBE with 18" resonator but it's still too loud, any idea on how to quiet it down without sacrificing power? I also have the side pipe welded to the muffler to reduce the drone at about 3k rpm, but that doesn't really do much at high rev. Thanks in advance.
__________________
Current: 2015 C200 / 2018 Cayenne / 2012 370z / 2012 C250 Coupe
Gone: 2013 Cayenne / 2004 Cayenne S / 2003 SL55 AMG / 2008 C300 / 2006 350z / 2006 C280 4Matic
andy_meng1024 is offline   Reply With Quote
Old 12-18-2018, 08:04 PM   #2 (permalink)
A True Z Fanatic
 
gomer_110's Avatar
 
Join Date: Aug 2011
Location: Perrysburg, OH
Posts: 17,992
Drives: '11 Nismo #528 GM
Rep Power: 36939
gomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond repute
Default

How the hell are you over 100dB with that setup? I have that same setup and consistently come in around 93-94 dB. Maybe try adding some turndowns on the tips that are pointed down to help quiet it down a bit.
Chuck33079, Rusty and Hotrodz like this.
__________________
'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
gomer_110 is offline   Reply With Quote
Old 12-18-2018, 09:47 PM   #3 (permalink)
Enthusiast Member
 
yaoxiao4's Avatar
 
Join Date: Feb 2017
Location: Bay Area
Posts: 320
Drives: 13 370z Black M6
Rep Power: 6
yaoxiao4 is on a distinguished road
Default

thats crazy, granted i dont have the FI LTH but my FI CBE (also 18 res) doesnt even break 90db on Laguna Seca
yaoxiao4 is offline   Reply With Quote
Old 12-18-2018, 09:49 PM   #4 (permalink)
Premium Member
 
Join Date: Nov 2009
Location: Taipei
Posts: 233
Drives: 2012 370z
Rep Power: 3380
andy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond reputeandy_meng1024 has a reputation beyond repute
Default

Quote:
Originally Posted by gomer_110 View Post
How the hell are you over 100dB with that setup? I have that same setup and consistently come in around 93-94 dB. Maybe try adding some turndowns on the tips that are pointed down to help quiet it down a bit.


What RPM did they use for sound level? The local track asks me to rev to 6k.


iPhoneTapatalk
__________________
Current: 2015 C200 / 2018 Cayenne / 2012 370z / 2012 C250 Coupe
Gone: 2013 Cayenne / 2004 Cayenne S / 2003 SL55 AMG / 2008 C300 / 2006 350z / 2006 C280 4Matic
andy_meng1024 is offline   Reply With Quote
Old 12-18-2018, 10:00 PM   #5 (permalink)
A True Z Fanatic
 
gomer_110's Avatar
 
Join Date: Aug 2011
Location: Perrysburg, OH
Posts: 17,992
Drives: '11 Nismo #528 GM
Rep Power: 36939
gomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond repute
Default

I do autox with SCCA. Generally they setup the sound meter along the course at a point where most people will be near redline. I'm sure I've been measured everywhere from 5500 to 7600 rpm.

Do you know what the settings on the sound meter are. Most have a peak capture mode along with an averaging mode. Averaging mode is what most organization use because peak basically screws everyone. I've see bone stock 911 GT3's hit 100 when measured in peak mode.

Easiest first attempt to get quieter would be to get some 90 ductwork elbows that will slip over the exhaust tips and use hose clamps to secure them in place. Make sure they are pointed down at the ground. This should help noticeable. It won't look pretty but won't lose performance and they can be removed after the event.
andy_meng1024 likes this.
__________________
'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
gomer_110 is offline   Reply With Quote
Old 12-20-2018, 10:01 PM   #6 (permalink)
A True Z Fanatic
 
Join Date: Apr 2013
Location: st. petersburg
Posts: 5,606
Drives: 09 nissan 370z Sp M6
Rep Power: 288665
Elmo370z has a reputation beyond reputeElmo370z has a reputation beyond reputeElmo370z has a reputation beyond reputeElmo370z has a reputation beyond reputeElmo370z has a reputation beyond reputeElmo370z has a reputation beyond reputeElmo370z has a reputation beyond reputeElmo370z has a reputation beyond reputeElmo370z has a reputation beyond reputeElmo370z has a reputation beyond reputeElmo370z has a reputation beyond repute
Default

Thank god I live in Florida. Car to loud for the track is ridiculous
madwi, Brendan, Spooler and 2 others like this.
Elmo370z is offline   Reply With Quote
Old 12-22-2018, 03:19 PM   #7 (permalink)
Ronin Samurai - Assassin
 
Rusty's Avatar
 
Join Date: Dec 2011
Location: Fayettenam,Pennsyltucky
Age: 66
Posts: 33,811
Drives: 2011 Nismo GM 6M
Rep Power: 2684433
Rusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond repute
Unhappy

Quote:
Originally Posted by Elmo370z View Post
Thank god I live in Florida. Car to loud for the track is ridiculous
A lot of tracks are like that now.
__________________

浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html
Rusty is offline   Reply With Quote
Old 12-22-2018, 05:00 PM   #8 (permalink)
A True Z Fanatic
 
gomer_110's Avatar
 
Join Date: Aug 2011
Location: Perrysburg, OH
Posts: 17,992
Drives: '11 Nismo #528 GM
Rep Power: 36939
gomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond repute
Default

Quote:
Originally Posted by Elmo370z View Post
Thank god I live in Florida. Car to loud for the track is ridiculous
I would normally agree with you but the fact is there's always those one or two aholes that show up with a straight piped POS that is loud for the sake of being loud. These jacka$$es are the ones that have ruined it for the rest of us.
Rusty, Brendan and Spooler like this.
__________________
'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
gomer_110 is offline   Reply With Quote
Old 12-22-2018, 05:11 PM   #9 (permalink)
Ronin Samurai - Assassin
 
Rusty's Avatar
 
Join Date: Dec 2011
Location: Fayettenam,Pennsyltucky
Age: 66
Posts: 33,811
Drives: 2011 Nismo GM 6M
Rep Power: 2684433
Rusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond reputeRusty has a reputation beyond repute
Talking

Quote:
Originally Posted by gomer_110 View Post
I would normally agree with you but the fact is there's always those one or two aholes that show up with a straight piped POS that is loud for the sake of being loud. These jacka$$es are the ones that have ruined it for the rest of us.
You ever get passed by a NACRAPER during a track day? Fvcker's will make your ears bleed.
__________________

浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
http://www.the370z.com/members-370z-...o-journal.html
Rusty is offline   Reply With Quote
Old 12-22-2018, 05:46 PM   #10 (permalink)
A True Z Fanatic
 
gomer_110's Avatar
 
Join Date: Aug 2011
Location: Perrysburg, OH
Posts: 17,992
Drives: '11 Nismo #528 GM
Rep Power: 36939
gomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond repute
Default

For me it's the miatas and civics that show up at autox with straight pipes that argue putting a muffler on would kill their power.
Rusty, Hotrodz and Spooler like this.
__________________
'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
gomer_110 is offline   Reply With Quote
Old 12-22-2018, 10:21 PM   #11 (permalink)
A True Z Fanatic
 
Join Date: Jun 2014
Location: Ga
Posts: 12,934
Drives: 2013 Nismo 370z
Rep Power: 2684388
Spooler has a reputation beyond reputeSpooler has a reputation beyond reputeSpooler has a reputation beyond reputeSpooler has a reputation beyond reputeSpooler has a reputation beyond reputeSpooler has a reputation beyond reputeSpooler has a reputation beyond reputeSpooler has a reputation beyond reputeSpooler has a reputation beyond reputeSpooler has a reputation beyond reputeSpooler has a reputation beyond repute
Default

Quote:
Originally Posted by gomer_110 View Post
For me it's the miatas and civics that show up at autox with straight pipes that argue putting a muffler on would kill their power.
What power? LOL
Spooler is online now   Reply With Quote
Old 12-22-2018, 10:40 PM   #12 (permalink)
A True Z Fanatic
 
gomer_110's Avatar
 
Join Date: Aug 2011
Location: Perrysburg, OH
Posts: 17,992
Drives: '11 Nismo #528 GM
Rep Power: 36939
gomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond reputegomer_110 has a reputation beyond repute
Default

Precisely their argument. When they only make ~100 hp, giving up 5 hp for a muffler is a 5% drop in in power.
Hotrodz likes this.
__________________
'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
gomer_110 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
SCCA Exhaust db Limit 14BlackCherry Track / Autocross / Drifting / Dragstrip 11 04-19-2016 09:49 AM
TSB time limit? tonybell_57 370Z Technical Service Bulletins (TSB) / Recalls 3 02-24-2014 10:33 AM
Speed limit reduced Mt Tam I am Nissan 370Z General Discussions 27 08-11-2012 07:47 PM
size limit chii370 Wheels & Tires 5 07-18-2011 04:18 PM
Rev Limit? Kendrick777 Engine & Drivetrain 10 04-29-2011 02:53 PM


All times are GMT -5. The time now is 12:25 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2