Quiet down 4" exhaust - Yellow Bullet Forums
;

Go Back   Yellow Bullet Forums > Technical Section > Turbo Charged - Precision Turbo & Engine

Turbo Charged - Precision Turbo & Engine

Reply
 
Thread Tools Display Modes
Old 10-21-2019, 08:56 AM   #1
forcd02
Senior Member
Smoked Another SBC
 
forcd02's Avatar
 
Join Date: Jun 2005
Location: woodbine, md
Posts: 19,198
Default Quiet down 4" exhaust

Trying to quiet down my truck, has a 6.0, turbo, and 4" exhaust to the rear bumper.
I have one round, straight thru Dynomax (22" case) before the rear, and another 12"
after the rear, then a short tailpipe. Trying to get the cab quieter, def going to do a lot
of insulating this winter, hopefully that helps that part. I was thinking of splitting the exhaust
into dual 3" and mufflers, not sure how much that helps. There was a muffler that had a flap
inside, open up under pressure, but finding 4" stuff reduces choices. They make some diff.
valves that open by pressure, or elect. I know the Hellcats used something to open up the
exhaust in perf. mode. Curious what guys are using to quiet things down, yet avoid
exhaust rests.
__________________
when your credit cards are max\'ed-call and raise the limits
forcd02 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-21-2019, 11:35 AM   #2
Briansshop
Senior Member
Smoked another BBC
 
Briansshop's Avatar
 
Join Date: Sep 2008
Location: MD,the East Coast CA
Posts: 1,861
Default Re: Quiet down 4" exhaust

Trucks are hard to get the drone out of,I guess the bed has to do with it. I took the single 4" off of mine a did a 3" dual,and was much better.
__________________
SBE 351W 10.26/134, 4280lbs
Briansshop is offline   Reply With Quote
Old 10-21-2019, 04:43 PM   #3
93hatch
Senior Member
Smoked another BBC
 
93hatch's Avatar
 
Join Date: Apr 2011
Location: Az
Posts: 1,529
Default Re: Quiet down 4" exhaust

Giant diesel straight through muffler
93hatch is offline   Reply With Quote
Old 10-21-2019, 05:06 PM   #4
my69brd
Chief Curmudgeon
Smoked Another SBC
 
my69brd's Avatar
 
Join Date: Apr 2014
Location: In every liberals nightmares
Posts: 12,771
Default Re: Quiet down 4" exhaust

Inyati bed liner in the bed
About as light as you'll get

Dynomat the behind the rear seats
(I know it's not light but it really works)

JMHDAO

__________________
my69brd is offline   Reply With Quote
Old 10-21-2019, 08:18 PM   #5
boostedbowtie
Senior Member
Smoked Another SBC
 
boostedbowtie's Avatar
 
Join Date: Dec 2009
Location: Florida
Posts: 22,760
Default Re: Quiet down 4" exhaust

Or this .

[IMG]Picture083 by David Cedoz, on Flickr[/IMG]
boostedbowtie is offline   Reply With Quote
Old 10-21-2019, 09:55 PM   #6
forcd02
Senior Member
Smoked Another SBC
 
forcd02's Avatar
 
Join Date: Jun 2005
Location: woodbine, md
Posts: 19,198
Default Re: Quiet down 4" exhaust

Quote:
Originally Posted by boostedbowtie View Post
Or this .

[IMG]Picture083 by David Cedoz, on Flickr[/IMG]
Thats kind of what Im thinking, split it up-did that to my Nova, was pretty quite, but the mufflers were baffled, rested.
__________________
when your credit cards are max\'ed-call and raise the limits
forcd02 is offline   Reply With Quote
Old 10-21-2019, 10:49 PM   #7
Lumbergh
Senior Member
Smoked Another SBC
 
Lumbergh's Avatar
 
Join Date: Sep 2007
Location: Paradise
Posts: 4,816
Default Re: Quiet down 4" exhaust

If you run a kill pipe/cancel pipe or two it might help, but it won’t be a huge difference with a 4” system. This would be a pipe plumbed into the exhaust pipe but running next to it with a capped end to kill/cancel exhaust pulses. Tough to explain, but I’ve seen it used before to eliminate drone on smaller systems and it works.

Edit: found a pic on the net, they call it a “side branch” https://www.yelp.com/biz_photos/blak...MPvk0TP8xN8tyQ
__________________
Fuck you Greta!

Last edited by Lumbergh; 10-21-2019 at 10:53 PM. Reason: Added link
Lumbergh is offline   Reply With Quote
Old 10-21-2019, 11:32 PM   #8
302StrokerGT
Senior Member
Smoked Another SBC
 
302StrokerGT's Avatar
 
Join Date: Nov 2013
Location: Garbage Can
Posts: 5,122
Default Re: Quiet down 4" exhaust

although its a car a i run a 3in side exit with a magnaflow rectangle/box straight through muffler for daily driving but i have a 4in bumper exit downpipe with a 4in loud valve that opens under boost.
__________________
Your Mom Says Hi

Me2 Machine (2)

DDS powder coating and bead blasting

In Gear Transmissions and Differentials

202 east main st
manasquan, NJ 08736
732-722-7387
302StrokerGT is offline   Reply With Quote
Old 10-22-2019, 10:15 AM   #9
vw_chuck
Junior Member
Spooled up
 
Join Date: Sep 2010
Posts: 138
Default Re: Quiet down 4" exhaust

Try necking it down to 3.5" and running a moroso spiral flow muffler. No restriction and they quiet down the exhaust using noise canceling technology. Pretty cool technology for a muffler actually. I run one and it works great.
vw_chuck is offline   Reply With Quote
Old 10-22-2019, 11:06 AM   #10
Orr89rocz
Senior Member
Smoked another BBC
 
Join Date: Nov 2015
Posts: 1,647
Garage
Default Re: Quiet down 4" exhaust

Quote:
Originally Posted by Lumbergh View Post
If you run a kill pipe/cancel pipe or two it might help, but it won’t be a huge difference with a 4” system. This would be a pipe plumbed into the exhaust pipe but running next to it with a capped end to kill/cancel exhaust pulses. Tough to explain, but I’ve seen it used before to eliminate drone on smaller systems and it works.

Edit: found a pic on the net, they call it a “side branch” https://www.yelp.com/biz_photos/blak...MPvk0TP8xN8tyQ
Thats helmholtz resonator tuning. If you know the frequency you are trying to eliminate you can calculate the volume and sizes of the resonator chamber to attach to your exhaust
__________________
1989 Camaro IROCZ
400" sbc twin turbo
8.24 @ 169 street car
Orr89rocz is offline   Reply With Quote
Old 10-22-2019, 01:30 PM   #11
forcd02
Senior Member
Smoked Another SBC
 
forcd02's Avatar
 
Join Date: Jun 2005
Location: woodbine, md
Posts: 19,198
Default Re: Quiet down 4" exhaust

Quote:
Originally Posted by Orr89rocz View Post
Thats helmholtz resonator tuning. If you know the frequency you are trying to eliminate you can calculate the volume and sizes of the resonator chamber to attach to your exhaust
I have heard about that, didn't know if it really worked. Some good suggestions.
__________________
when your credit cards are max\'ed-call and raise the limits
forcd02 is offline   Reply With Quote
Old 10-22-2019, 03:17 PM   #12
vw_chuck
Junior Member
Spooled up
 
Join Date: Sep 2010
Posts: 138
Default Re: Quiet down 4" exhaust

That is how the spiral flow muffler also works. It splits the flow and gets half the flow out of phase with the center flow and they cancel each other out when they are reintroduced to each other at the exit of the muffler. Plus they don't cost much.
vw_chuck is offline   Reply With Quote
Old 10-22-2019, 06:48 PM   #13
stevieturbo
Senior Member
Smoked another BBC
 
Join Date: Aug 2010
Location: Norn Iron
Posts: 3,832
Default Re: Quiet down 4" exhaust

Quote:
Originally Posted by vw_chuck View Post
That is how the spiral flow muffler also works. It splits the flow and gets half the flow out of phase with the center flow and they cancel each other out when they are reintroduced to each other at the exit of the muffler. Plus they don't cost much.
I tried 3" Moroso Spiralfow's a few years back.

Unbeknown to me at some point internally they collapsed leaving only the centre hole of around 1.5" inside them

Strangely...never noticed any change in performance.

And this didnt take years...I'd say it must have been weeks or months. Do not use spiralflows.

Really...as big a muffler as possible, I found the perforated tube/packing quieter than any chambered design too.
__________________
blow me
https://www.youtube.com/watch?v=Ss_c7fML3rw

What the f****
stevieturbo is offline   Reply With Quote
Old 10-22-2019, 09:34 PM   #14
Tom89lx
Junior Member
Spooled up
 
Join Date: Apr 2013
Location: Macon GA
Posts: 204
Default Re: Quiet down 4" exhaust

Just put a good muffler system on it. I split my car's 4" downpipe into two 3" into Borla XS mufflers (straight through ovals) and it is quiet as can be. Easy handle over 1000 HP with almost no change in pressure from a dump. It isn't even worth using a cut out.

Just be careful how you do the split.
Tom89lx is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-23-2019, 01:33 PM   #15
vw_chuck
Junior Member
Spooled up
 
Join Date: Sep 2010
Posts: 138
Default Re: Quiet down 4" exhaust

Quote:
Originally Posted by stevieturbo View Post
I tried 3" Moroso Spiralfow's a few years back.

Unbeknown to me at some point internally they collapsed leaving only the centre hole of around 1.5" inside them

Strangely...never noticed any change in performance.

And this didnt take years...I'd say it must have been weeks or months. Do not use spiralflows.

Really...as big a muffler as possible, I found the perforated tube/packing quieter than any chambered design too.
Yes they have a 1.5 inch hole down the middle and a spiral channel around the outside of the 1.5 inch tube down the middle. half the flow goes down the middle and half goes around the outside. Nothing "collapsed" that is how they are new. You obviously didn't build the system or put them on yourself or you would know this.
vw_chuck is offline   Reply With Quote
Reply

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



All times are GMT -4. The time now is 01:53 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 0%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Yellow Bullet LLC
 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.