Anyone used one before? I'm sick of glasspacks blowing out but they're tough to beat for ease of use. This seems like it would last longer and hopefully be more quiet.
I'd like to know as well if they work without sacrificing performance and I do know were you're coming from for noise level which caused me to have to make another setup with turbo mufflers..
The spirals would be a great exhaust for the stock 3.4 DOHC exhaust routing in a Fiero. I wonder what the shortest lengths are
[This message has been edited by Erik (edited 05-02-2006).]
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11:23 PM
Erik Member
Posts: 5625 From: Des Moines, Iowa Registered: Jul 2002
well I checked them out and the shortest length I could find was 12 inches which is just a bit too long if one wanted to use 2 within the stock Fiero muffler area ..like this setupwas and i had to shorten the glasspaks to get them to fit
of course if you were to lower them to the same level as the bottom of the back of the cradle then there would be room depending on the angle of the Y pipe or one could use a T but that would cut down on flow
[This message has been edited by Erik (edited 05-02-2006).]
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11:30 PM
Erik Member
Posts: 5625 From: Des Moines, Iowa Registered: Jul 2002
I'm only using a single tip.. this is what my setup looks like:
The overall length of the Spiral Flow is 18", which is the same as my glasspack IIRC, I'll have to get the measuring tape.
no dual? Thats cool but if you use the total length of the spiral then you would probably have to do a 90 degree radius off the exhaust manifold flange off to one end of the availible area then a u raduis then the muffler which would just fine for a single outlet. Of course i like duals it looks sort of funny to me to have the space for it on one side and nothing there ..too bad there isn't a filler panel so it looks like it came with a single stock
just wanted to add that the 12 inch is the case length so that would be the minimum space you could go unless you wanted to cut into the muffler and that would probably not work with the spiral design
[This message has been edited by Erik (edited 05-03-2006).]
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12:01 AM
Erik Member
Posts: 5625 From: Des Moines, Iowa Registered: Jul 2002
I'm thinking since they are race mufflers then they probably would be on the loud side but, at least they wouldn't change tone or noise level as the muffler aged due to blow out like you mentioned ..i wish I'd known about them a few days ago before I put this latest system together or i would have been very tempted to try them out
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12:09 AM
May 5th, 2006
Doug Chase Member
Posts: 1487 From: Seattle area, Washington State, USA Registered: Sep 2001
Anyone used one before? I'm sick of glasspacks blowing out but they're tough to beat for ease of use. This seems like it would last longer and hopefully be more quiet.
We tried one on an exhaust we built for an RX-8. It sounded decent and quiet enough but it cost some power on the top end so we didn't stick with it. I'll dig up the dyno sheets and see if these results would be applicable to you. It's quite possible you'll be fine because your power level and rpm will be lower than the RX-8.
Correct me if I'm wrong but it looks as though the muffler is designed to help "scavange" the exhaust? You gain more power if the motor doesnt have push out the exhaust against atmospheric pressure. I believe I've heard that if you keep the heat in the exhaust until it exits the pipe the better it is for scavenging.......
I used the Moroso muffler on my 2.9 for a season. It is very strongly built, but it is mild steel and you have to paint it. No kidding, at idle everybody who didn't know I had a six, thought it was an SBC. The 4 sets of baffles modulate the pulses so it sounds like an 8. You don't realize it is a 6 until the revs are up.
The muffler sounded totally awesome, however, I have 2 close neighbours, both shift workers and with babies, so I did the 'nice' thing and replaced it with a Superturbo. I LOST NOTICABLE TORQUE DOING THIS.
The Moroso muffler is a racing muffler and flows very well.
My next muffler (I can't live with the torque loss) will be a Magnaflow.
Arn
PS. I think 12" was not correct. I think the body was 14" and with the 2.5" inlet
[This message has been edited by Arns85GT (edited 05-06-2006).]
Try to PM forum member Bryson or Rejuvinated. Bryson built a Quad 4 Turbo and the first exhaust he had on the car was a spiral insert. I think the insert was built the same as the muffler you are looking at. It was pretty loud. In fact when he drove it in parking garages, it set the alarms off in every car he drove near... He replaced it with a different exhaust set up.
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06:57 AM
jeffndebrus Member
Posts: 2772 From: Jacksonville, Fl- usa Registered: Aug 2001
I'd like to know as well if they work without sacrificing performance and I do know were you're coming from for noise level which caused me to have to make another setup with turbo mufflers..
Erik, Nice setup---thinking those would work nice with our 4.9's---who makes those small turbo mufflers?
The spirals would be a great exhaust for the stock 3.4 DOHC exhaust routing in a Fiero. I wonder what the shortest lengths are
I had a custom made system done by a friend that does conversions--this is for a 3800Sc stock ported manifolds, he put 2 glass packs on it with resonators--sorry guys I can`t take resonators, so I ripped them off the back , and installed the stock Fiero tips again, my question is ---not trying to high jack the thread--but some said that key word above--what can I use to sound more like a SBC V-8, I know it won`t be the same--but anything has to sound better than those glass packs--I like the Fiero roar/growl sound better on the stock 2.8`s I have here , if I could get close to that I`d be happy as a pig in Sh^t any ideas?
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07:45 AM
Riceburner98 Member
Posts: 2179 From: Natick, Ma, USA Registered: Apr 2002
I had one on my last 3800 swap, along with a Flowmaster 80 (used it after the cat, before the Flowmaster) and it was still loud as heck. Can't comment on performance as I have no reference. But it did rust very badly after only a couple of months. (didn't paint it, doh.)
------------------ Bob Williams Working on the next 3800 swap.. Missing the working one already!
I have them on my car. I got them because I couldnt find a 2 1/2 cherry bomb that was short enough and also didnt want to replace them every couple of years. They seem to flow pretty well on my SBC bored 40 over with 10 - 1 pistons. They are loud but not too bad, you would probably want to take a break after a few hours drive but I think you will run out of gas in a V8 before it gets too bad
I dont have mandral bent tube installed yet, I have parts store pipe. Thats part of the reason I went with the 2 1/2 because of the elbows have restrictions.
Originally posted by Doug Chase: We tried one on an exhaust we built for an RX-8. It sounded decent and quiet enough but it cost some power on the top end so we didn't stick with it. I'll dig up the dyno sheets and see if these results would be applicable to you. It's quite possible you'll be fine because your power level and rpm will be lower than the RX-8.
I have plenty of top end on my car but it is lacking the low end grunt that you get with a quieter muffler. Thats not a bad thing when you dont want to replace the tranny all the time.
quote
Originally posted by Riceburner98: But it did rust very badly after only a couple of months. (didn't paint it, doh.)
I panted mine but I worry that it will rust out from the inside. It would be worth it to powder coat them if you can afford it.
[This message has been edited by Jake_Dragon (edited 05-06-2006).]
Jake I know the standard theory is that a little backpressure enhances low end torque, but just the opposite happened with my 2.9 V6. I'll tell you the story just for reference. The Moroso was too loud where I live. When I removed the Moroso, which is a real 95db muffler and went to a quieter Superturbo, I lost torque. I mean noticable torque.
In doing alot more researching since then, I have discovered that this is normal. Here's what I learned. I made a performance mistake when I switched mufflers. You need really good extraction at low rpms to clear your cylinders and get maximum fuel mixture when vacuum is low. Chambered mufflers don't extract well. Also oversized pipes don't do a good job down low. The pipe isn't narrow enough to create suction behind the exhaust air pulse. However, the right size pipe will work best unbaffled. In fact, our Y pipe is offset which enhances the scavenging effect. Sorry for getting off topic a bit.
The bottom line is that quiet comes with a performance price, but the Moroso was a little too loud for me.
Jake I know the standard theory is that a little backpressure enhances low end torque, but just the opposite happened with my 2.9 V6. Arn
It is loud but I think its a good loud I may add some tips later to mellow it out but I like them and like the fact that they should last longer than the glasspacks. Now if they dont rust and fall apart.
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03:41 PM
Jul 24th, 2006
Blacktree Member
Posts: 20770 From: Central Florida Registered: Dec 2001
Can anyone comment on the noise level of the Spiral Flow muffler as compared to a glass-pack?
You see, I have this old cherry bomb that needs to go bye-bye. And I want to replace it with something roughly the same size and shape. But I don't want the replacement muffler to be any louder.
I replaced my Moroso with a Superturbo and then a Magnaflow which is a steel wool pack, not fiber. The Magnaflow is noticably quieter than the Moroso, but a little louder than the Superturbo which is chambered. It sounds good and deep, and flows very well, but the car once again sounds like a 6.
