Re: Dynomax Super Turbo Mufflers.!
[Re: 62maxwgn]
#1254725
06/22/12 10:22 AM
06/22/12 10:22 AM
|
Joined: Jan 2003
Posts: 9,924 Weddington, N.C.
Streetwize
master
|
master
Joined: Jan 2003
Posts: 9,924
Weddington, N.C.
|
I've met comparatively few people (outside these forums of course...how's that George? )that seem to have more than a passing understanding of exhaust backpressure and how it relates to a 4 cycle exhaust system. If a conventional muffler (turbo or otherwise) is trully "restrictive" It is logical that you would be able to measure positive pressure against the walls of the muffler case because the gasses can't get out as fast as they are coming in. We've probably all seen 'blown out' mufflers or cases that have been swollen (if only slightly) by excessive exhaust pressure. Also, more surface area (which includes the pipe walls themselves and absorbtion is evident because the pipes get hot) there is in a system can actually aid power because by absorbing the exhuast heat you are cooling and slowing the energy that remains in the system until it exhusts to the atmosphere. EX On a Big B or E body with a 3" system there's a LOT of pipe upstream of the mufflers that aids in reducing the remaining energy before it ever gets to the case. Also, the net effect is really at what point does the exhuast slow the rate of acceleration of the motor? Assuming no tire slip, a given car/motor going from idle to WOT with 3.55 gears vs say 4.30 gears, a more restrictive muffler will have less of an effect on acceleration because the peak volume of air moving through the engine meters through the system CFM per second at a lower rate. Some People erroneously assume that flowmasters are 'restrictive' because they flow less CFM in a side by side 'free flow test'; this really has little if any bearing on what an actual 4 cycle exhaust system does), a Flowmaster (and similar designs) operate very much like a check valve in that they are designed (in theory) to capture and channel the FORWARD moving" exhaust pulses while reducing the reversion effects of the vaccuum created behind each exhuast pulse as the valve is closing behind a high velocity stream. In an open pipe atmospheric air naturally fills the void and as we know air has mass that must be 'pushed' through the pipe before the exhaust exits the system. I don't mean this as a 'dissertation' at all, I'm just pointing out there's a lot of HYPE and "seat of the pants" testimonials that don't always stand-up 'real world' to sound engineering logic ....and timeslips. On a race car, sure but on the street... opinions vary of course
Last edited by Streetwize; 06/22/12 10:45 AM.
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: DARTH V8Я]
#1254729
06/22/12 11:39 AM
06/22/12 11:39 AM
|
Joined: Jan 2003
Posts: 9,924 Weddington, N.C.
Streetwize
master
|
master
Joined: Jan 2003
Posts: 9,924
Weddington, N.C.
|
Neither am I, not by a long shot! But I think it's been proven (especially with the turbo crowd) that a properly merged big single system can make as much power as a dual and typically can be made lighter or more strtegically routed to aid weight distribution.
Many of the mid 90's early 2000's F-BOdy GM's still run big 3 1/2 - 4" single systems because (and having owned one and worked for SLP on Many of them) the underside of those cars doesn't lend itself to running a true dual system...it's doesn't seem to hurt he performance at all.
Last edited by Streetwize; 06/22/12 11:41 AM.
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: Streetwize]
#1254730
06/22/12 11:49 AM
06/22/12 11:49 AM
|
Joined: Jun 2008
Posts: 768 Maryville tn
67coronetman
OP
super stock
|
OP
super stock
Joined: Jun 2008
Posts: 768
Maryville tn
|
Look i didn't want to get everyone all pumped up i just wanted to know if anyone has used the Dyno max super turbos on there cars and how they liked them.!
Old car are me......
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: 67coronetman]
#1254731
06/22/12 11:59 AM
06/22/12 11:59 AM
|
Joined: Jan 2003
Posts: 9,924 Weddington, N.C.
Streetwize
master
|
master
Joined: Jan 2003
Posts: 9,924
Weddington, N.C.
|
Mark, No worries mate! It's all good! We're all friends in here so we just say what's on our minds. So How's the 431 shortblock coming? Just talked to Hollis last week about my Rocky, you still thinking about sending your E-heads to him for a little 'respiratory enhancement'? I'll be up in Oak Ridge next week, shoot me your number maybe I can come by and meet ya. Another practical thing about Backpressure is (generally) the further the resistance occurs from the exhaust valve the less impact it has and there is a distinction between backpressure which effectively slows the acceleration rate of the piston on the power stroke and Dilution/reversion (which generally is where exhaust that can't escape the port is 'trapped' in the combustion chamber dilutes the incoming charge during overlap.) Also, even atmospheric pressure is 'backpressure' ...but as it is a phyisical constant (a fact of life) it's effect is sometimes 'ignored'. but the negative pulses behind each high pressure 'slug' of exhaust is key to achieving a basic understanding the flowmaster (and similar designs) exhaust theory.
Last edited by Streetwize; 06/22/12 12:15 PM.
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: JAMESDART]
#1254734
06/22/12 07:15 PM
06/22/12 07:15 PM
|
Joined: Aug 2007
Posts: 2,754 Conway, SC
T2R9
master
|
master
Joined: Aug 2007
Posts: 2,754
Conway, SC
|
Love them! Had flowmaster 40's with full 2 1/2 exhaust on my Charger thanks to the PO and the drone was terrible at 40-50 and too damn loud all the other times. I bought the long Super Turbos and no drone, nice sound and the wife will now ride with me! Good price to boot!
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: 67coronetman]
#1254735
06/22/12 10:38 PM
06/22/12 10:38 PM
|
Joined: Jan 2003
Posts: 11,095 Berlin, N.J.
abodyjoe
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 11,095
Berlin, N.J.
|
Quote:
First i am over the flowmaster drone in my car. So i am going with the Dynomax Super Turbo Mufflers since i have TTI Headers from the articles i have read they do very well and sound very good has anyone out here used the Mufflers.They will be the 3" inlet & 3" outlet
Thanks .!
have the 3" on my dart and love them.. nice deep sound, not too loud and no drone.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt. www.MoparMisfits.com
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: 69Cuda340S]
#1254739
06/23/12 02:27 PM
06/23/12 02:27 PM
|
Joined: Jun 2008
Posts: 768 Maryville tn
67coronetman
OP
super stock
|
OP
super stock
Joined: Jun 2008
Posts: 768
Maryville tn
|
Just wanted to say thanks for the reply and the car sounds great in your video.! But i have to disagree with you i just had them installed and the car is way queiter and has a great sound at idle and i don't see any performance diff in my car there is almost no drone noise at all and cruising now is a pleasure and they are cut off at the rearend 3" pipe in to 3" inlet & 3" outlet plus i had a H-pipe installed & the cars sounds better to me now ((plus lots of noise don't make it faster.!)) Quote:
I was running the 2 1/2" Dynomax Super Turbo mufflers. They sounded good but had 2 1/4" passages on the inside and with a center outlet restricting flow on the first turn they stunk as far as performance went. I had a thread on this a while back and the older versions of the Super Turbos did not have the smaller internal passages. Heck why not run a restrictor plate on your carburetor too? Switched to Ultra Flos and car pulls way harder. Its just a tad louder then before and no drone:
http://billsgarage.info/BarracudaVideos.html
Old car are me......
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: abodyjoe]
#1254740
06/23/12 05:15 PM
06/23/12 05:15 PM
|
Joined: Jun 2008
Posts: 768 Maryville tn
67coronetman
OP
super stock
|
OP
super stock
Joined: Jun 2008
Posts: 768
Maryville tn
|
I agree i had a new system put on today 3" to the rear and a h-pipe man that car sounds great.! I love it
Old car are me......
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: 67coronetman]
#1254741
06/23/12 08:51 PM
06/23/12 08:51 PM
|
Joined: Nov 2005
Posts: 210 mass,usa
sickhemi
enthusiast
|
enthusiast
Joined: Nov 2005
Posts: 210
mass,usa
|
i had the 21/2 super turbos on my dart 440 with a 528 solid cam sound awesome not real loud like flowmasters which i dont like. i can hear my car radio with the super turbos!! they gets pretty loud when you stomp on it but quiet at idle and not too loud cruising
1968 gts 355 r3 six speed efi with irs in progress and 1969 convt 440 stage 6 efi 5spd dana
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: sickhemi]
#1254742
06/23/12 09:53 PM
06/23/12 09:53 PM
|
Joined: Jun 2008
Posts: 768 Maryville tn
67coronetman
OP
super stock
|
OP
super stock
Joined: Jun 2008
Posts: 768
Maryville tn
|
I agree mine are the same it really sounds good driving or at idle i am very glad i did go with the Dynomax Super Turbo Mufflers i used the 3" in & 3" out i should have done this along time ago.!
Old car are me......
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: 67coronetman]
#1254743
06/23/12 10:39 PM
06/23/12 10:39 PM
|
Joined: Jan 2003
Posts: 9,924 Weddington, N.C.
Streetwize
master
|
master
Joined: Jan 2003
Posts: 9,924
Weddington, N.C.
|
The 3" hemis are hard to beat and they are a larger case ( length, width And Height) than the 2 1/2's, and they flow a whole lot better. If you look at the 2 1/2's the case is pretty skinny and as such I'm willing to bet the 2 1/4 internals help the flow. If the case were as tall as the 3" theyed be much better.
Mopar muscle did s test between 3" old rusty hemi turbos and brand new ultra flows and the 67 coronet with a 630+ HP 493 ran like (IIRC on it's best run) .17 seconds faster in a less than true Apples to Apples testing. They were also several dbs louder. With new muffs I think the results would have been closer. I love the hemi turbos they're quiet enough and perform well enough to make a 700hp 12:1 motor quiet enough to drive through my neighborhood at any time of night, and I couldn't do that with flowmasters or ultraflows. As for feeling the mufflers holding my motor back, well I cant feel it and I'm packing some pretty respectable power levels.
Last edited by Streetwize; 06/24/12 04:35 AM.
|
|
|
Re: Dynomax Super Turbo Mufflers.!
[Re: Streetwize]
#1254744
06/23/12 10:52 PM
06/23/12 10:52 PM
|
Joined: Jun 2008
Posts: 768 Maryville tn
67coronetman
OP
super stock
|
OP
super stock
Joined: Jun 2008
Posts: 768
Maryville tn
|
Yea i looked at those after i had already got my Dynomax super turbo mufflers that is what i had on my 67 GTX back in the 80! But i must say these dynomax super turbo mufflers sound very good and as far as i can tell my cars pulls just as hard but alot quieter.! And yes your car is a killer street ride very nice.! Quote:
The 3" hemis are hard to beat and they are a larger case ( length, width And Height) than the 2 1/2's, and they flow a whole lot better. If you look at the 2 1/2's the case is pretty skinny and as such I'm willing to bet the 2 1/4 internals help the flow. If the case were as tall as the 3" theyed be much better.
Mopar muscle did s test between 3" old rusty hemi turbos and brand new ultra flows and the 67 coronet with a 630+ HP 493 ran like (IIRC on it's best run) .17 seconds faster in a less than true Apples to Apples testing. They were also several dbs louder. With new muffs I think the results would have been closer. I love the hemi turbos they're quiet enough and perform well enough to make a 700hp 12:1 motor quiet enough to drive through my neighborhood at any time of night, and I couldn't do that with flowmasters or ultraflows. As for feeling the mufflers holding my motor back, well I cant feel it and I'm packing some pretty respectable power levels.
Old car are me......
|
|
|
|
|