ITT: we compare length, girth, and quality ;) - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 04-28-2014, 01:25 PM   #1
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,584
Wink ITT: we compare length, girth, and quality ;)

Of exhaust resonators

I used two giant (21" I think) resonators on my '00 in addition to a vibrant 11x14 or something like that muffler. It sounded grrrreat.

This is for a different car, not a miata, but since you gayz are really helpful in making me make decisions, I axe this here:

which one would you run?

MagnaFlow Exhaust Products - For Trucks, Suv's, American Muscle, Diesel, & Sport Compact Vehicles

or

Vibrant Performance ::.

Both are bottle style resonators, both are similar in size, one has moar length the other moar girth. Quality to me looks comparable, as both magnaflow and vibrant seem to be decent brands for mufflers/resonators. The magna is a tiny bit cheaper.

The goal, as it is always with me, to make the car as quiet and resonance free as possibru. The catch is, I can't use the big 'ol vibrant "utra quiet" becuase it won't fit otherwise I'd use that.

I've read arguments about length vs girth, and majority seem to agree that girth is more important at killing noise, since you get more exhaust packing and whatnot.

Input appreciated.
18psi is offline   Reply With Quote
Old 04-28-2014, 05:12 PM   #2
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

Both. And isnt this the wrong section?

More muffler packing volume = more better. More different lengths of those hot dog resonators = more better. Use all of them. I used both lenghts of the dynomax racing bullets as resonators in my car, I cant tell you how much it drones because the AWR mounts make it loud in the cockpit even with the stock exhaust, but combined with the borla muffler in the back they car is pretty quiet.
Leafy is offline   Reply With Quote
Old 04-28-2014, 05:13 PM   #3
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,584
Default

I can't use both. I can only use one.
And I just realized about posting this in the wrong section like a n00b. whoops lol
mods can haz move plox?
18psi is offline   Reply With Quote
Old 04-29-2014, 01:35 AM   #4
Junior Member
 
Join Date: Dec 2006
Location: Vancouver, BC
Posts: 131
Total Cats: 6
Default

The Magna says it has a 2.5" core. I wouldn't use that. I would use this: MagnaFlow Exhaust Products - For Trucks, Suv's, American Muscle, Diesel, & Sport Compact Vehicles
VanMSM is offline   Reply With Quote
Old 04-29-2014, 01:46 AM   #5
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,584
Default

Interesting, so basically the core is more thin on one and more thick on the other, despite same ID and same OD?

Doesn't that make it pretty much a slightly larger version of the vibrant?

Thanks for posting, I guess I should keep looking. I don't think I can go any larger than about 5" OD on the canister, adn about 20" length.
18psi is offline   Reply With Quote
Old 04-29-2014, 10:02 AM   #6
Elite Member
iTrader: (8)
 
Join Date: Dec 2008
Location: Kingston, Ontario
Posts: 2,791
Total Cats: 71
Default

girth before length with mufflers/resonators. though there is a happy balance usually with real estate under a car. fit the largest one you can in the space you have available if you want to make it as quiet as you can (obvious)

if your using a muffler too, don't get a muffler under the car and another at the back. it will still resonate.

Looking at them both in hand they look the same but the perforation and the packing does different things. Mufflers quiet it down, resonators remove resonance. it really comes down to what your end goal is with adding this to the exhaust.

I just built an exhaust system for a Miata in Texas that uses the vibrant resonator above (and only that) it will be extremely loud, but it wont resonate (drone) as much as if it were a straight pipe.
shlammed is offline   Reply With Quote
Old 04-29-2014, 10:07 AM   #7
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

Technically resonators dont have packing. When using a round glass pack, shaped like a resonator you're trying to get both the resonator effect to kill drone while also using the muffler packing to attenuate sound. I really wish I could find a good deal on a slip roll so I could start making custom fit rebuildable resonators. Its actually really easy.
Leafy is offline   Reply With Quote
Old 04-29-2014, 10:21 AM   #8
Elite Member
iTrader: (8)
 
Join Date: Dec 2008
Location: Kingston, Ontario
Posts: 2,791
Total Cats: 71
Default

I wish I had space for more tools, like a slip roll. LOL.

If your building yourself an exhaust, don't discount any spaces.
You can make a Helmholtz resonator off of the tube to tune out resonances at a specific RPM (usually highway cruising rpms). they are more effective close to the engine, but you can see them on all kinds of aftermarket exhausts from the last 10-20 years. they don't take up a lot of space and they actually work, with minimal added backpressure. many factory mufflers are straight through tubes now with these resonators inside with the muffler casing as the resonator volume.
shlammed is offline   Reply With Quote
Old 04-29-2014, 10:34 AM   #9
Senior Member
iTrader: (4)
 
Join Date: May 2010
Location: Cedar Rapids
Posts: 674
Total Cats: 29
Default

I can make you a bottle shaped helmholtz resonator that is 4" or 5" diameter depending on what frequency you are trying to kill. That would work far better than just throwing additional "resonators" at it.
vteckiller2000 is offline   Reply With Quote
Old 04-29-2014, 11:17 AM   #10
Senior Member
iTrader: (3)
 
Join Date: May 2005
Location: Mass.
Posts: 816
Total Cats: 41
Default

FYI - Abe @ ARTech fit one of the larger volume Vibrant resonators at the mid-pipe on my 1.6 2.5" exhaust and an "ultra quiet" resonator out back. The longer resonator fits well in the mid-pipe volume.

Vibrant Performance ::.

You can get an idea for the size in this low-res pic.



Can't comment on sound yet.


-Zach
Attached Thumbnails
ITT: we compare length, girth, and quality ;)-59148_514270412432_2793483_n.jpg  
thasac is offline   Reply With Quote
Old 04-29-2014, 11:17 AM   #11
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,584
Default

Thanks for the inputs guys, I appreciate it. Keep em coming of course.

I feel like I need to give you the full scenario, so here goes:

car is a '13 wrx, not a miata. I bought a really expensive and good quality Cobb exhaust for it, to replace the Invidia Q300 that's currently on there, and is a bit too loud for my tastes. The cobb is already quiet, but the one I bought is used and has a resonator on it, which is about 10" long, which is damaged (he bottomed out on a rock or something).

So now I have the opportunity to cut out this super short super thin resonator, and replace it with another one of my own choosing. The current one is thin too - only 4" in OD. I feel like I can easily fit 5" since my current invidia Q300 has a 5" resonator.

Some pictures:

current invidia with the 5" OD resonator:


the Cobb with its tiny 4" OD resonator:



I THINK I MIGHT be able to fit a vibrant "ultra quiet" into the space I'm working with, but really not sure, and don't want to take chances.
18psi is offline   Reply With Quote
Old 04-29-2014, 11:21 AM   #12
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,584
Default

Here is the ONLY exhaust I can ever find for this car that seems to have been able to fit the Ultra Quiet:





doesn't that look really really close though?

I don't want it to rub/hit anything
18psi is offline   Reply With Quote
Old 04-29-2014, 11:58 AM   #13
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,584
Default

I think I'm going to try to take measurements tonight
18psi is offline   Reply With Quote
Old 04-29-2014, 12:01 PM   #14
Senior Member
iTrader: (4)
 
Join Date: May 2010
Location: Cedar Rapids
Posts: 674
Total Cats: 29
Default

Quote:
Originally Posted by 18psi View Post
I think I'm going to try to take measurements tonight
Do eet
vteckiller2000 is offline   Reply With Quote
Old 04-29-2014, 12:02 PM   #15
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

Quote:
Originally Posted by 18psi View Post
I think I'm going to try to take measurements tonight
I recommend a soft tape measure. The normal ones have surprising sharp edges when they contact that sensitive skin.
Leafy is offline   Reply With Quote
Old 04-29-2014, 12:04 PM   #16
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,584
Default

Quote:
Originally Posted by Leafy View Post
I recommend a soft tape measure. The normal ones have surprising sharp edges when they contact that sensitive skin.
did you cut your ***** again?
18psi is offline   Reply With Quote
Old 04-29-2014, 12:14 PM   #17
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

Quote:
Originally Posted by 18psi View Post
did you cut your ***** again?
It only happened once.
Leafy is offline   Reply With Quote
Old 04-29-2014, 12:26 PM   #18
FAB
Fab9Tuning.com
iTrader: (4)
 
FAB's Avatar
 
Join Date: Apr 2013
Posts: 943
Total Cats: 394
Default

Most resonators including the Magnaflow and Vibrant have material surrounding the inner core. The only "on paper" difference between these two is the material - The Vibrant offers a T304 Stainless Steel construction and I can tell you from experience, their stuff is easy to weld (not that I doubt Magnaflow would be).

The Magnaflow Glass pack material also doesn't have the greatest reputation for longevity. Take this with a grain of salt - Due to their large compatibility and brand awareness in the US there is obviously far more info out there about Magnaflow but a quick search turns up some pretty surprising information.



More volume gives the resonator a better ability to cancel drone, allowing the unwanted or annoying waves of sound pressure somewhere to go for better resonance throughout the system. Resonator placement comes into play when you are looking to change the tone of your exhaust but in most situations you're limited by space - Also if you're making an entire exhaust sound will also change with material, wall thickness blah blah blah.

All in all - I'd go with the Vibrant. Either direction you choose, just try to avoid placing it too close to your engine for longevity reasons (assuming a boosted application?).
FAB is online now   Reply With Quote
Old 04-29-2014, 12:38 PM   #19
Elite Member
iTrader: (8)
 
Join Date: Dec 2008
Location: Kingston, Ontario
Posts: 2,791
Total Cats: 71
Default

Quote:
Originally Posted by 18psi View Post
doesn't that look really really close though?

I don't want it to rub/hit anything
looks reasonable.

If your worried about it swinging, get poly exhaust bushings. they don't sway or stretch as much.

Magnaflow and vibrant both weld fine. the magnaflow mufflers case isn't as nice and polished as a vibrant one, so it does need a flap disc clean up before you weld it.
The only thing I hate welding with exhausts is flex bellows because you cant really clean them up well enough for my standards prior to welding.
if your having a shop do the replacement, I wouldn't worry about the welding factor. lol



It sounds like you do want a muffler... to quiet it down. more than a resonator.
shlammed is offline   Reply With Quote
Old 04-29-2014, 12:45 PM   #20
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,196
Total Cats: 2,584
Default

Yep, I agree. I think I'm going to try to get the vibrant ultra quiet to fit, and if it doesn't, then I'll go with the 5" OD round one from either magna or vibrant.
18psi is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 Yesterday 09:00 PM
Another Cast Manifold Corky Bell Prefabbed Turbo Kits 18 11-22-2016 10:01 PM
K&N Intake Filter nbdooey Miata parts for sale/trade 0 09-28-2015 09:46 PM
wiring wideband ground to battery terminal btabor ECUs and Tuning 10 09-28-2015 06:33 PM
Now shipping NC MX-5 (2006-15) Precision Sliding Seat Mounts FAB Fab9 Tuning - Miata Performance Parts 0 09-11-2015 01:02 PM


Thread Tools

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:15 AM.