LocostUSA.com

Learning how to build Lotus Seven replicas...together!
It is currently March 28, 2024, 9:28 am

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 47 posts ]  Go to page Previous  1, 2, 3, 4  Next
Author Message
 Post subject: Re: Quieter exhaust
PostPosted: June 26, 2012, 11:31 pm 
Offline

Joined: January 14, 2012, 8:08 am
Posts: 38
Miatav8,MstrASE,A&P,F wrote:
There is nothing wrong with trading a few hp at the top of the rev range for less noise at all revs.


Co-Signed by the guy with a 2" diameter 1' long wastegate dump to atmosphere, and a full 4" pipe from the turbo to the rear bumper. I used to get phone calls from a friend that lived a mile away telling me to knock it off as he was trying to sleep - he actually never missed. :lol:

Knocking down the dB's also lets you drive further without exhausting yourself, and get through traffic without feeling guilty / nervous about the trooper on the side of the road with his window down.


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: April 18, 2013, 8:39 pm 
Offline
User avatar

Joined: December 7, 2012, 8:28 am
Posts: 1410
Location: Sarasota
Great advice I think I will go with two of the Harley ones to keep the noise down on my S2000 motor when it is finally running.

_________________
2015 & 2016 EMod Florida State Autocross Champion
2013 & 2014 DSP Florida State Autocross Champion

Scrap Metal Build Log viewtopic.php?f=35&t=14558


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: April 18, 2013, 11:18 pm 
Offline
Mid-Engined Maniac

Joined: April 23, 2006, 8:26 pm
Posts: 6410
Location: SoCal
In general, the larger the muffler the better.

_________________
Midlana book: Build this mid-engine Locost!, http://midlana.com/stuff/book/
Kimini book: Designing mid-engine cars using FWD drivetrains
Both available from https://www.lulu.com/


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 5, 2014, 11:52 am 
Offline

Joined: February 28, 2009, 11:09 pm
Posts: 1307
Location: Connersville, Indiana
My old muffler got too loud, so I started looking around. The smallest high flow muffler I could find was the Dynmax Super Trap. It is available with 2" inlet and outlet and is only 3 1/2" thick, even though the web site says otherwise.

http://www.dynomax.com/mufflers/super-turbo-mufflers

It quieter than the 2" "installer" turbo muffler it replaced. I have a 2" glass pack in front of it and the combination is as quiet as a stock setup, at least at low throttle. The downside: It is available only in steel and is butt ugly, like any other cheap muffler.

Bill


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 5, 2014, 12:29 pm 
Offline
User avatar

Joined: October 27, 2006, 3:29 pm
Posts: 459
Location: Indiana
locofinn wrote:
Racing Beat pre-silencer and silencer squeezed in as small a space as possible. Hope it is under 100 db at full throttle.



FYI, This turned out to be very quiet. A good rumble at idle but "street car quiet" on the track. This set up will be for sale soon and I am changing my engine.

_________________
Building a whole car from scratch is a 1,000 little tasks, done 1 task at a time, while thinking 10 tasks ahead, then redoing it anyway.
South Bend Region SCCA D-Modifed Class Autocross & Track-Day/TT. Chevrolet 1.4 L Turbo Ecotec Power


Link to my build log:
http://www.locostusa.com/forums/viewtopic.php?f=35&t=3356


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 6, 2014, 12:09 pm 
Offline
User avatar

Joined: June 8, 2010, 8:02 pm
Posts: 621
Location: White Rock, BC, Canada
Does anyone know of a quiet oval muffler with inline, offset inlet/outlet?
Something like:
Image

I need to get my V6 down to 92dB for autoX.

Cheers.

_________________
Build log: viewtopic.php?t=9291


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 6, 2014, 4:05 pm 
Offline
User avatar

Joined: August 19, 2006, 5:48 pm
Posts: 1217
Location: S. Florida
C10CoryM wrote:
Does anyone know of a quiet oval muffler with inline, offset inlet/outlet?

Cheers.
The old Corvair had an offset muffler. The offset is from one corner at one end to the center at the other end.

http://www.ebay.com/itm/Walker-Exhaust- ... 1d&vxp=mtr

_________________
"My junk is organized. At least is was when I put it wherever it is." -olrowdy
Completed building GSXR1000 CMC7, "Locouki"
Website: http://projekt.com/locouki/


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 6, 2014, 7:06 pm 
Offline
Automotive Encyclopedia
User avatar

Joined: December 22, 2006, 2:05 pm
Posts: 8037
Walker Quiet Flow 3 replacement for 84-86 mustang, pn 22348
4.25 x 8.813 Oval, offset, 2.25 in , 2.25 out, 13 inch case, 16 inch overall.
Also has a handy bracket built in but you can cut it off.

Too quiet? Use the Walker Sound FX instead of quiet flow 3. It is going to be louder than the mustang anyway since there will be no tail pipe. I only use Walkers. They cost a bit more but they are made better than most.

http://www.summitracing.com/parts/wlk-22348/overview/

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 6, 2014, 7:41 pm 
Offline

Joined: June 24, 2007, 6:04 pm
Posts: 1521
I agree with MiataV8 as far as using the Walkers, I am using a Walker Quiet flow #21028 originally for the 1962 chevy truck.
It is quiet enough for the wife and I to carry on a conversation yet sounds very muscular when the the throttle is put down.
I have been quite happy with it. It doesn't have a fancy chrome or polished finish, but on the other hand you could put a polished heat screen around it.
In my case I didn't bother and have yet have any negative comment on my muffler, it looks period and like it belongs.
Plus it works well.
I ordered mine locally, the site below just shows the muffler.

Al

http://www.oreillyauto.com/site/c/detail/WAL2/21028/02421.oap?year=1962&make=Chevrolet&model=C30%2BPickup%2BRWD&vi=1324796&ck=Search_02421_1324796_-1&pt=02421&ppt=C0022

_________________
Super Seven 3.4


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 6, 2014, 9:56 pm 
Offline
User avatar

Joined: June 8, 2010, 8:02 pm
Posts: 621
Location: White Rock, BC, Canada
Thanks guys.

Specifically I was wondering if there one a muffler where the inlet and outlet are in line, like in the picture. Would make my life easier as my exhaust is already done, just with mufflers which are likely too loud.

Cheers.

_________________
Build log: viewtopic.php?t=9291


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 6, 2014, 10:47 pm 
Offline
Toyotaphobe
User avatar

Joined: April 5, 2008, 2:25 am
Posts: 4829
Location: Fort Worth, Texas
Don't know nothing bout no inline outlets, but I prefer the Borlas to the Walkers. They have a better tone and I've never heard a too loud Borla and I have heard a too loud Walker.

_________________
mobilito ergo sum
I drive therefore I am

I can explain it to you,
but I can't understand it for you.


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 7, 2014, 6:34 am 
Offline
Automotive Encyclopedia
User avatar

Joined: December 22, 2006, 2:05 pm
Posts: 8037
To fit the space, the list is short and loud considering no tail pipe. Flowmaster 40, pn 942444.

A good round walker muffler will be 6 or 7 inches thick with an inch of clearance and much longer but look much better and more original to a seven than an oval. Case lengths range from 13 to 29 inches and the ports are offset on both ends. I'd avoid glass packs or anything made for tractors.

Unlike an oval, a round muffler can be rotated so the offset can be minimized at the expense of being more or less outboard. The inlet can hug the car so the case clearance to the body is good and ground clearance is good without kicking out the pipe at a weird angle or a tight bend. You just end up with a longer hanger at the outlet. Just figure out how long of a muffler you can fit.

One like this for your pipe size:

http://www.summitracing.com/parts/wlk-17878/overview/

I'm way too cheap for anything with borla written on it.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 7, 2014, 11:42 am 
Offline

Joined: June 24, 2007, 6:04 pm
Posts: 1521
Or like the one I am mentioned a couple of posts ago which is 5 inches in diameter, though a little more costly than the Summit one MiataV8 has shown.
Still the idea is the same, on the other hand don't confuse the great V8 sounds you get from any of these Borlas or Flowmaster performance style mufflers etc, when you install them on a 4 or 6 cylinder motor, it doesn't always translate..

Al

_________________
Super Seven 3.4


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 7, 2014, 7:02 pm 
Offline
Toyotaphobe
User avatar

Joined: April 5, 2008, 2:25 am
Posts: 4829
Location: Fort Worth, Texas
raceral wrote:
on the other hand don't confuse the great V8 sounds you get from any of these Borlas or Flowmaster performance style mufflers etc, when you install them on a 4 or 6 cylinder motor, it doesn't always translate..

Al



The Borla is the only thing that tamed my Miata and it gave a very pleasing note. I tried 3 other mufflers first so i could have saved myself a lot of money by just going Borla in the first place.

_________________
mobilito ergo sum
I drive therefore I am

I can explain it to you,
but I can't understand it for you.


Top
 Profile  
Reply with quote  
 Post subject: Re: Quieter exhaust
PostPosted: June 7, 2014, 9:06 pm 
Offline
User avatar

Joined: June 8, 2010, 8:02 pm
Posts: 621
Location: White Rock, BC, Canada
Good point on the round mufflers. I figured that I wouldn't be able to fit a large diameter one there, but wasn't thinking about offset openings. I currently have it set up for magnaflow 4" rounds which I'm pretty sure are going to be well over 92dB. If I could, I would shut up the exhaust to be silent, and only hear the blower whine. Not a fan of the 90° V6 sound.
On that note, my blower/intake could be too loud as well.

_________________
Build log: viewtopic.php?t=9291


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 47 posts ]  Go to page Previous  1, 2, 3, 4  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
POWERED_BY