Go Back   Honda-Tech > Honda and Acura Technical Forums > Welding/Fabrication
Sign in using an external account
Register Forgot Password?
Search


Welcome to Honda-Tech!
Welcome to Honda-Tech.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Honda-Tech community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread
Old 03-06-2012, 07:45 PM   #1
Vagmaster
Honda-Tech Member
Garage is empty, add now
 
Vagmaster's Avatar
 
Join Date: Nov 2008
Location: Long Island, NY, USA
Posts: 34
iTrader Rating: (0)
Send a message via AIM to Vagmaster
Default custom exhaust questions got a drone from 3-4K rpm

Made a custom exhaust on my car downpipes are 3" and merges into a 3.5" exhaust i got a annoying drone/rattle between 3-4K rpm only. I already have a Vibrant Muffler and a inline 3" muffler. I was thinking adding 2 glasspack bullet mufflers closer to my downpipes one on each downpipe before the merge. Do you guys think that would get rid of the drone/rattle can noise?
Vagmaster is offline   Reply With Quote
Old 03-08-2012, 03:40 AM   #2
Vagmaster
Honda-Tech Member
Garage is empty, add now
 
Vagmaster's Avatar
 
Join Date: Nov 2008
Location: Long Island, NY, USA
Posts: 34
iTrader Rating: (0)
Send a message via AIM to Vagmaster
Default Re: custom exhaust questions got a drone from 3-4K rpm

??? anyone
Vagmaster is offline   Reply With Quote
Old 03-08-2012, 03:40 PM   #3
intense4thgen
Honda-Tech Member
Garage is empty, add now
 
intense4thgen's Avatar
 
Join Date: Aug 2007
Location: barrie, canada
Posts: 432
iTrader Rating: (0)
Default Re: custom exhaust questions got a drone from 3-4K rpm

maybe post a pic so we can see what you have done and give some advice
__________________
1991 Civic Sedan Built b20/vtec
PTE 6265 486/325 @17psi
Thanks to tony at Dynamotorsports.ca
intense4thgen is offline   Reply With Quote
Old 03-09-2012, 07:40 AM   #4
sitinduk
Honda-Tech Member
Garage is empty, add now
 
sitinduk's Avatar
 
Join Date: May 2006
Location: Huntington, NY
Posts: 201
iTrader Rating: (0)
Default Re: custom exhaust questions got a drone from 3-4K rpm

Supposedly, glasspack type mufflers are only good at muffling higher frequency sound waves:
http://www.enoisecontrol.com/related...rrier_wall.pdf
Might want to look into a branch resonator.
sitinduk is offline   Reply With Quote
Old 03-09-2012, 06:10 PM   #5
Vagmaster
Honda-Tech Member
Garage is empty, add now
 
Vagmaster's Avatar
 
Join Date: Nov 2008
Location: Long Island, NY, USA
Posts: 34
iTrader Rating: (0)
Send a message via AIM to Vagmaster
Default Re: custom exhaust questions got a drone from 3-4K rpm

ill be making a side branch resonator then, seems like the best choice, My engine is 2.7L twin turbo and the rpm drone at 3-4K rpm is a killer cant stand to drive the car anymore.

Should i make my side branch resonator out of pipe with a cap on it or pipe to resonator with a cap on it.
Vagmaster is offline   Reply With Quote
Old 03-09-2012, 06:25 PM   #6
Vagmaster
Honda-Tech Member
Garage is empty, add now
 
Vagmaster's Avatar
 
Join Date: Nov 2008
Location: Long Island, NY, USA
Posts: 34
iTrader Rating: (0)
Send a message via AIM to Vagmaster
Default Re: custom exhaust questions got a drone from 3-4K rpm

here is a picture of my exhaust since then i have added another 3.5 Muffler right where the long piece of straight pipe is
Attached Images
 
Vagmaster is offline   Reply With Quote
Old 03-11-2012, 09:33 AM   #7
timg
Honda-Tech Member
Garage is empty, add now
 
timg's Avatar
 
Join Date: Aug 2004
Location: Kennett Square, PA
Posts: 319
iTrader Rating: (0)
Default Re: custom exhaust questions got a drone from 3-4K rpm

Honda used a Helmholtz resonator on the S2000 to deaden drone. It's just a short piece of capped pipe welded perpendicular to the exhaust. You could try that. I'm not sure how long or what diameter it would need to be to fix your problem though. Could be worth looking into.

Tim
__________________
2004 S2000 - GT3076R, KPro III, Pauter, Arias 9.5:1 CR, GE sleeve, 443 whp, 363 lb-ft
1995 Chevy Monte Carlo Z34 - turbo'd @ 10 psi, self tuned to 325 whp, 350 lb-ft
2007 Saab 9-7X 6.0i - modded LS2 tow vehicle, KW coilovers, 323 awhp
timg is offline   Reply With Quote
Old 03-11-2012, 09:59 PM   #8
SovXietday
Honda-Tech Member
Garage is empty, add now
 
SovXietday's Avatar
 
Join Date: Jan 2005
Location: Lower Right Hand Corner, PA
Posts: 5,526
iTrader Rating: (0)
Send a message via AIM to SovXietday
Default Re: custom exhaust questions got a drone from 3-4K rpm

^ That piece is acoustically tuned to take care of the resonance of the stock exhaust. Without high tech audio and a good bit of know how he really has no hope in making that. Both width of the pipe and length of the pipe are crucially important in cancelling the drone he is targeting.
__________________
Quote:
Originally Posted by wantboost View Post
New guy came in thinking he was hot ****

Denied
SovXietday is offline   Reply With Quote
Old 03-13-2012, 04:44 AM   #9
uberEFtuner
Honda-Tech Member
1991 Honda Civic
My Garage
 
uberEFtuner's Avatar
 
Join Date: Mar 2007
Location: Stroudsburg, PA, USA
Posts: 875
iTrader Rating: (0)
Default Re: custom exhaust questions got a drone from 3-4K rpm

The setup you have has long straight sections. The long straight sections are "tuned" to particular frequencies. I would install a resonator in the middle of the longest pipe.
__________________
Its all about HONDA help your brothers.
uberEFtuner is offline   Reply With Quote
 
 
 
submit to reddit
Reply

Tags
2008, 3, 53i, 97x, crx, custom, downpipe, exhaust, glasspack, glasspacks, honda, s2000, saab, tech, turbo

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Forum Jump



All times are GMT -8. The time now is 12:01 PM.



2008 Copyright, InternetBrands Inc.
Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

Honda and the Honda marquee are registered trademarks of the American Honda Motor Company, Inc. Neither American Honda Motor Company nor its subsidiaries or affiliates shall bear any responsibility for Honda-Tech.com content, comments, or advertising. Honda-Tech.com is not affiliated with American Honda Motor Company in any way. American Honda Motor Company does not sponsor, support, or endorse Honda-Tech.com in any way. Copyright/trademark/sales mark infringements are not intended or implied.
Emails & Contact Details