Oh noes, dynomax ultraflow, sounds a little ricey!

[the poi]

Finsihed up welding together my exhaust, 3in turbo to tail, witha single dynomax welded muffler (ultraflow, starightthrough). Cuts down on the idle sound and the the volume throughout the rpm range, cept from about 2k- 4k it has somewhat of the characteristiocs ricey rumbly farty sound. The volume is fine, but is there anything I can do to cut down on that weird exhasut note? I was thinking just another ultraflow in the middle of the system... wil that work or will it just make it quieter?

[245gti]

Where is your muffler located? This my 3" system with a Dynomax Ultraflow muffler and it's almost too quiet. Certainly not ricey....

http://www.pbase.com/image/16858157/large

Now....that same muffler in a side exit was substantially louder although the tone was much deeper than a rice rocket....

[the poi]

Where is your muffler located? This my 3" system with a Dynomax Ultraflow muffler and it's almost too quiet. Certainly not ricey....

http://www.pbase.com/image/16858157/large

Now....that same muffler in a side exit was substantially louder although the tone was much deeper than a rice rocket....hmmm, intersting, may just be resoance im hearing IN the car... in any event, the uffler is right at the back, right now, there is nothing really attached to the other end, so its dumping a foot short of the car right out the stock opening. Im going to be putting on a tip that will estend it out tongiht...maybe that will clear up tyhe rpbolem

[BudGT]

Having the muffler dump out before the rear of the car definately makes a difference.
My 780 with stock B280 has a single muffler system that is quiet, however when the tailpipe rusted and fell off - the resonance was really noticeable inside. Its just the way the exhaust pulses bounce off of things.

[EricF]

Having the muffler dump out before the rear of the car definately makes a difference.
My 780 with stock B280 has a single muffler system that is quiet, however when the tailpipe rusted and fell off - the resonance was really noticeable inside. Its just the way the exhaust pulses bounce off of things.

HUGE difference... Get some piping to dump it a few inches beyond the rear bumper, and the in-car volume difference will be crazy. I'd imagine your wierd tone might go away as well.

[towerymt]

I've got a Magnaflow. There's a raspy buzz at around 4000rpm (only when the ambient temp is warm, oddly), but the muffler was MUCH, MUCH louder when it ended under the car (rear 240 location, parrallel to the bumper). Adding a 90° bend and a tailpipe 2" past the muffler made a huge difference. There was really bad droning, vibrating, whatever you want to call it, which went away after the tailpipe.

[Anonymous]

Yeah, if you end the exhaust with a muffler, the note will sound fluffy at certain RPMs. Gotta stick a tailpipe on there - the shape of it makes a difference, believe it or not! Did you use a resonator as well? That makes a difference too.

[Hank Scorpio]

Whats wrong with rice? :rofl:

[dl242gt]

In my experience with the large 4 cylinder motors like these. You get a resonance zone from around 2k-3k rpms. I didn't find it very bad on my
MVP system. However, before that I ran a Dynomax UltraFlow and it had the resonance problem. I added a ricer APC resonated slash cut tailpipe and that cured it. It made the exhaust note really nice. In the past I've also used a pencil tip Monza resonated tip to cure this on other systems I had on my car. Try out a resonated tip. It will cure these types of issues and look nice, too.

[Anonymous]

Thats funny cause my super loud side exit dynamax bullet exhaust system is ONLY quiet from 2-3300 rpm cruising lol

[the poi]

I was thinking about a "resonating" exhaust tip as well, but didn't know if it would make it better or worse, good to know theres an easy solution (and I need an exhaust tip anyway, the tip i put on is pretty ghetto). IM a little leary about APC product quality, will it do just fine? Any sources for any brands that aren't too pricey? i've been having trouble finding a selection with a 3in inlet...

[jackbombay]

What is with all this exahaust tip talk? Mine is just a 2.5 inch pipe sticking out the back, sleeper stlye, no bling all zing. Makes dusting unsuspecting fools all the more humiliating for them since my car looks stock except for the 2.5" exahaust compared to 2.25" stock system, but only volvo freaks would ever notice that.

-Jack

[Two245Turbos]

You need a RESONATOR right before the tailpipe...I have one @5"dia.x24" long, high flow/no restriction works perfect with my 2.5" catback/ProFlo Turbo...Low tone, not ricey...
http://www.savepic.com/freepicturehosting/is.php?i=53011&img=DSC03467.jpg

[the poi]

You need a RESONATOR right before the tailpipe...I have one @5"dia.x24" long, high flow/no restriction works perfect with my 2.5" catback/ProFlo Turbo...Low tone, not ricey...
[img]http://www.savepic.com/freepicturehosting/is.php?i=53011&img=DSC03467.jpg[img]hmm, sounds good... would it work just as well before the muffler, my muffler is right at the exit (tis a 700 wagon, so no right angle bend), cause i have a pretty big straight pipe i coul replace with a resonator + cat...

[dl242gt]

Heehee, to find a tip big enough for a 3" exhaust. You have to shop in the pickup and truck exhaust section. I like the sound of my MVP exhaust
without one. But all of my former 2.5" systems sounded much better
with a resonating tip. The resonating style tip has a glasspack built into
it.

Rice is good and healthy for you to eat.

[towerymt]

Before:
http://mason.gmu.edu/~mtowery/volvo/240/MVC-580S.JPG

After:
http://mason.gmu.edu/~mtowery/volvo/MVC-594S.JPG

Did I mention that I pieced this together myself with low quality Advance Auto exhaust pipe? :rofl: I'm just glad my car's so low in the back that most people can't see it. Mostly a temp solution to get through emissions/inspection and replace the old muffler:

/MVC-584S.JPG (http://mason.gmu.edu/~mtowery/volvo/240/MVC-584S.JPG)

[Pennybridge Pioneer]

someone likes exhaust clamps :wink:

[the poi]

they make resonating 3in tips? I cant sem to find anything cept for a 50 dollar dual outlet Monza from summit... seems a littl emuch when i need something a lot simpler...

[towerymt]

someone likes exhaust clamps :wink:

That someone isn't me. The midas guy enlarged the wrong end of my 90° bend, so then he had to stretch the straight piece even further to fit the enlarged side. Ended up not fitting, cut the end off the straight pipe, put that on the muffler, then the bend, then the tailpipe. PITA, but it works, barely leaks, and is rock solid. With the coat hanger metal adding support to the tailpipe, I can kick or stand on it w/o damage.

[The Aspirator]

would it work just as well before the muffler, my muffler is right at the exit (tis a 700 wagon, so no right angle bend), cause i have a pretty big straight pipe i coul replace with a resonator + cat...
I want to know this too, where's the best place to put a resonator... before or after the muffler?

I think I'll go with something like what Dale has, maybe a little bit bigger muffler for the sleeper effect.

John

[the poi]

as far as just muffler tips are concerend... hows this, http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1365&prmenbr=361 ? Think it'll do any good?

[Boosted2003]

i have 3 inch dyno max muffler on my car.. Only thing you can hear at wot is turbo or when letting gas off it back firing a bit.

[dl242gt]

they make resonating 3in tips? I cant sem to find anything cept for a 50 dollar dual outlet Monza from summit... seems a littl emuch when i need something a lot simpler...

Ha, I bought that thing. You can buy mine if you want it. I wouldn't recommend using it. As soon as I saw it, I didn't like the way the exhaust flow went through it. So, I went to Pep Boys and in the truck exhaust section there was an APC resonated slash style tip. It looked nice enough so I bought it. Turned out that it's the exact size of my 3 inch pipe. I'd have to goto an exhaust shop to have them stretch it so it fits over my present 3 inch pipe. Just haven't got around to it because I'm happy for
now with the system the way it is.
Wish you well,

[245gti]

[quote:cfded1e923="the poi"]would it work just as well before the muffler, my muffler is right at the exit (tis a 700 wagon, so no right angle bend), cause i have a pretty big straight pipe i coul replace with a resonator + cat...
I want to know this too, where's the best place to put a resonator... before or after the muffler?

I think I'll go with something like what Dale has, maybe a little bit bigger muffler for the sleeper effect.

John[/quote:cfded1e923]

John.

I wish I could get an audio clip of mine. It's not loud. In fact, I think it's too quiet. C'mon....I'm over 40. Do you really think I want a loud exhaust system? Do you think my wife would allow it? Well....maybe, but.....

Seriously though, if you build a system like mine and use the Dynomax Ultraflow, I think you'll be surprised at how quiet it really is....

[stylngle2003]

I'm over 40. Do you think my wife would allow it? Well....maybe, but.....


haha speaking of,
when i got my 2.25" installed (it was still my mom's DD) we initially used only 2 glasspack resonators. it was sooo loud and ricey but sounded awesome....
my mom called my mechanic (Martin Motorsports) and said "Take this damn thing off, and tell my husband its me or the fuc.king exhaust!"

needless to say, we put a magnaflow on the back lol!


Billy

[The Aspirator]

I wish I could get an audio clip of mine. It's not loud. In fact, I think it's too quiet. C'mon....I'm over 40. Do you really think I want a loud exhaust system? Do you think my wife would allow it? Well....maybe, but.....

Seriously though, if you build a system like mine and use the Dynomax Ultraflow, I think you'll be surprised at how quiet it really is....

Ok Dale I'll take your word for it, I mean I'm half your age!!! So a little bit loud is cool, what's the tone of yours like? Deep? Rumbly? Throaty? etc? What size Dynomax is that?

Actually when I weld up my system at my buddies shop, I'm printing out pictures of your piping layout so I can copy it! haha, you've got some great pictures there so I'll be using them for refference.

Although it appears that my exhaust might have to wait a while, cause I'm gettin a wagon! But it needs an engine, B23E maybe, then turbo it!!

Thanks!

John

[qwkswede]

Where is your muffler located? This my 3" system with a Dynomax Ultraflow muffler and it's almost too quiet. Certainly not ricey....

http://www.pbase.com/image/16858157/large

Now....that same muffler in a side exit was substantially louder although the tone was much deeper than a rice rocket....

Why did you choose to go over the axle on a 240? And is your Volvo lowered? Do you ever bump the axle against the exhaust when the suspension compresses?

[Anonymous]

I built the exhaust for my old yellow 242 before it went on Dale's car, so I'll answer these if ya don't mind.

My yellow car was lowered about 2" in the rear, and it was lowered with just chopped sedan springs so they were pretty soft. It never dinged the exhaust pipe at all. I just hammered the crap out of the top of the pipe 'cause there's a crossmember right there and once I built the system the tight-by-design clearance disappeared, so I needed to make a little room. That little flat spot isn't going to hurt flow at all, so no big deal, right? Also, there's another flat spot where it goes under the tranny crossmember. On my car, I left it round and the damn thing just scraped every speedbump I crossed, so I tightened it up for Dale by shortening the downpipe and the vertical leg right before the axle, necessitating the clearance at the crossmember.

I went for an over-the-axle exhaust because I did more playing with springs, shocks, etc., than I did on the motor that required exhaust removal. I felt that if I was going to do any work to the rear suspension, I needed to leave some clearance under the axle so it doesn't restrict working room, and there's lots more room above the axle than below it. I also had an old IPD rear sway from a '76 264, and in '76 the exhaust went over the axle so the sway bar didn't have room for an under-axle exhaust. Also I liked having room under the axle for jack stands, and the over-axle design allows you lots of jack stand room. The extra pipe and bend seems like it would flow worse, but to get an under-axle design tight enough under the body so it doesn't scrape, but far enough under the axle so it doesn't bang on bumps, requires as many turns and almost as much pipe.

I've changed transmissions, engines, and turbos while leaving the exhaust in place - when changing engines or turbos, I just had to loosen one hanger and pry the system backwards to disconnect from the turbo. Then the exhaust would drop down to sit on the floor, out of the way. Granted, an under-axle design is easy to drop in one piece, provided you can get it up high enough. The exhaust I have now in my car is more like a 740, where the muffler and resonator and tailpipe all run down and exit the passenger side. It goes under the axle, so I've had to remove it for other work. Because it doesn't go across the car to exit on the drivers' side, once the whole thing hits the floor it can be turned (axially) 90 degrees so the downpipe is laying flat on the floor, and then the whole shebang gets pulled out the rear. A traditional under-the-axle, muffler-across-the-rear exhaust is much more difficult to pull out.

One thing Dale's pictures don't show is the resonator - it looks as though there's only the one muffler there. The resonator is hidden by the over-the-axle leg... Originally I had a piece-of-crap chambered muffler where Dale's got the Ultraflow, and without the resonator that thing was NOISY!!! I had to add the resonator to get it down to a reasonable level. At the time, Dale bought the Ultraflow and we built a side-exit exhaust for his wagon. It was about as noisy as my two-muffler system standing at the tailpipe, but because it came out the side of the car it was more annoying to drivers and passengers. When I gave my exhaust to Dale, we cut apart his side-exit and used his muffler in place of mine, which went in the garbage. His new system is nice and quiet - too quiet for a "hot rod" but great for a DD.

[qwkswede]

Very interesting. I had a 3" under the axle on one of my volvos. Actually a V8 car, but it was a 3" just the same. That car was lowered a bit, maybe 2". I would scrape the exhuat all the time on speed bumps. Usually at the section right before it went under the axle. Maybe I could have raised the system a little, but it was very close to the axle when the car was on jacks with the wheels hanging down. It was less than ideal. It seems like the over the axle idea addresses alot of those issues. I just never thought you could get pipe that large over the axle. I'll have to take a closer look at that when I build the system for my current project. I wonder if a nice ovalized peice of 3.5" would make it over the axle? Not that I am going to build anything quite that big. But, you never know. heheh.

[740TurboPerformance]

What............? :???: My Dynomax UltraFlow SS sounds bad ass and I had my resonator removed............, not ricey at all, it has a low deep rumble "whoom, whoom, whoom, whoom" at idle and really barks when you get on it, when the RPM's start going high it can sound a bit ricey which is understandable because it is a 4cyl. When crusing or barely getting on the gas you get a very nice, low, mean growl "vvvvvroooooooooooooo" sound, I love it.


Generally when using a 3" or larger opening on a 4cyl it can make it sound ricey, that's why ricers sound that way, they use those mufflers with big ass openings. My opening I believe is the same as stock or something like a quarter inch bigger. Also be sure to use a rear muffler that is about the same overall size as stock, you use a little or shorter muffler and it might sound like crap, using one about the overall size as OE will help maintain a nice deep tone.


Also bare in mind that if you just installed this that it is not going to sound to its full potential. When my Dynomax was first installed you could barely tell the difference. With about 15,000 miles on it I can say that it definately sounds deeper and meaner than at first when I had it installed.