Re: Mufflers... Any E.T gain from swapping?
[Re: MadMopars]
#1573466
02/03/14 03:17 AM
02/03/14 03:17 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Just curious, has anyone ever swapped mufflers and picked up E.T.? If so how much, what mufflers, what size exhaust and whats your approximate horsepower? I've seen dyno claims that say there is power to be gained by getting rid of my Flowmasters but I'm not sure I buy it, at least in my application. Thoughts?
Your Flowmasters are one of the worst muffs out there and yes ET can be had from just muffs... I like Dynomax Super Turbos
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Re: Mufflers... Any E.T gain from swapping?
[Re: Cab_Burge]
#1573468
02/03/14 10:39 AM
02/03/14 10:39 AM
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Joined: Dec 2006
Posts: 1,178 Indy
FlyFish
super stock
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super stock
Joined: Dec 2006
Posts: 1,178
Indy
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I think it really depends on the motor. For example, my car runs almost the same with or without the exhaust...just a couple hundredths slower with the exhaust on, and that it probably due to the added weight (about 25 lbs or so). My exhaust exits just before the rear tire, and I pull it off the car from time to time, not much different in ET, just louder....my exhaust consists of 3" flowmasters with 3" pipes.
67 Barracuda street car, 408, e85, 1.38 60', 6.44 @105.9 in the 1/8 mile, 10.19 @130.5 in the 1/4...so far....
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Re: Mufflers... Any E.T gain from swapping?
[Re: FlyFish]
#1573469
02/03/14 11:17 AM
02/03/14 11:17 AM
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Joined: Feb 2003
Posts: 1,942 Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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Try measuring back pressure, or drop the exhaust and make a pass, see if it picks up. Every car will want something a little different.
Dropping the dual 3" w/ 2 chamber flows gained 0.1 sec on my Belv, running mid 11's
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: Mufflers... Any E.T gain from swapping?
[Re: Spaceman Spiff]
#1573471
02/03/14 11:31 AM
02/03/14 11:31 AM
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Joined: Nov 2010
Posts: 3,698 jersey
Spaceman Spiff
master
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master
Joined: Nov 2010
Posts: 3,698
jersey
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The car in the article above is now in the low 11's, with the same exhaust as when this article was written.
526 cubes of angry wedge, pushbutton shifted, 9 passenger killer!
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Re: Mufflers... Any E.T gain from swapping?
[Re: MadMopars]
#1573472
02/03/14 12:51 PM
02/03/14 12:51 PM
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Joined: Jan 2003
Posts: 12,814 Benton, IL.
DaveRS23
Master of nothing...
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Master of nothing...
Joined: Jan 2003
Posts: 12,814
Benton, IL.
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There are so many variables on this. You won't know what your combo likes until you try a thing or two. Certainly the more flow out of the engine, the more critical the exhaust becomes.
Personally, I run electric cut-outs on all my cars. That way, I can have my quiet and my noise with no compromise on performance. And they are a blast at shows and cruises.
Master, again and still
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Re: Mufflers... Any E.T gain from swapping?
[Re: Spaceman Spiff]
#1573473
02/03/14 01:25 PM
02/03/14 01:25 PM
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Joined: Jan 2003
Posts: 1,301 Tucson AZ,
MadMopars
OP
pro stock
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OP
pro stock
Joined: Jan 2003
Posts: 1,301
Tucson AZ,
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Quote:
http://www.boyleworks.com/ta400/psp/exhaust.html
Interesting read. Although I really like the sound of the Flowmaster's it's to bad they perform so poorly in comparison to others. I wish they hadn't tested on a single exhaust application. Not really apples to apples, but still useful none the less.
I find it hard to believe there was so much gained by stepping up to an X pipe. That may be worth looking into on my car.
Quote:
Personally, I run electric cut-outs on all my cars. That way, I can have my quiet and my noise with no compromise on performance. And they are a blast at shows and cruises.
I have cut outs on there now. I just haven't opened them up in years. I will probably open them up next trip out just to see how restrictive the exhaust really is.
It's a toss up for me. I know that the car runs better with the tunnel ram on and the exhaust opened up but I'm trying to build a "Fast Street Car". If I open the exhaust and put the tunnel ram on I will have a "Slow Race Car". I use both of those terms loosely in either direction.
I think cruising around and going to the track bring on two different mentality's. On the street it's cool when it looks like a race car. At the track it's cool when it looks like a street car.
I'll continue to struggle with my conflicting predicament.
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Re: Mufflers... Any E.T gain from swapping?
[Re: 383man]
#1573476
02/03/14 04:11 PM
02/03/14 04:11 PM
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Joined: Jan 2003
Posts: 8,082 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,082
Tulsa OK
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I run a 3" exhaust that reduces to 2.5" after the mufflers and out the back. I took off flowmasters and replaced them with magnaflows and picked up 1-2mph right off. It also shined some light on some fuel delivery problems I was having as it went waayyy rich when i swapped the mufflers. I have since taken some fuel out and still need to take more and the car has picked up considerably. It was obviously constipated with the flowmasters on there.
This is on a 450-500HP 360. The car is also a lot quieter and it sounds better IMO.
68 Barracuda Formula S 340
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Re: Mufflers... Any E.T gain from swapping?
[Re: MadMopars]
#1573478
02/04/14 12:26 PM
02/04/14 12:26 PM
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Joined: Jan 2003
Posts: 13,496 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,496
Marion, South Carolina [><]
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Like said before, there's a lot of variables. There's no question a straight through style muffler flows better than a flowmaster, but will making the switch make your car run faster? Maybe, maybe not. One of my old 440s w/ a 509 cam and ported 915s ran 11.40s at 117 mph in my cuda through 3" exhaust and 2 chamber flowmasters. It ran no better w/ open headers...and yes I tried to tune for the difference. My last 440 ran 10.40 at 129 mph through 4" exhaust w/ 2 chamber flowmasters. Open headers made no difference. I don't think it would have needed a 4" system if I had better flowing mufflers to run that. I just happen to like the sound of Flowmasters. Having said that, I have seen guys change from flowmasters to a straight through style muffler (Dynomax Ultraflow, Magnaflow, or Hooker Max Flow) and have the car run faster. My current hemi combo loses a little over a tenth and about 1.5-2 mph (compared to open headers) when I run it w/ the 4" H pipe system w/ a pair of one chamber flowmasters....but the system is heavy and hemis hate mufflers (generally).
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Mufflers... Any E.T gain from swapping?
[Re: an8sec70cuda]
#1573479
02/04/14 01:11 PM
02/04/14 01:11 PM
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Joined: Jan 2003
Posts: 482 Marysville Wa
moparfan
mopar
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mopar
Joined: Jan 2003
Posts: 482
Marysville Wa
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My demon has TTI headers and a 3" x pipe and mufflers at the rear axle, switched from a 2 chamber Flow Master to Dynomax ultra flows same day at the track, probably an hour apart. no noticable difference in et or MPH, it's quieter with the ultraflows though.
Like said above, lots of varibles.
2017 Challenger R/T Scat Pack Shaker 2021 T/A 392 1970 Challenger R/T 383,727, 3.55, (Wife's car) 1970 Challenger R/T SE 440-4, 4-speed, 4.10 Dana 1972 Dodge Demon 396 W-2,904, 4.30, 10.660 @ 125.85 2020 Hellcat redeye
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Re: Mufflers... Any E.T gain from swapping?
[Re: an8sec70cuda]
#1573480
02/04/14 01:14 PM
02/04/14 01:14 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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When I was back in the lab we tested multiple style and manufactures of muffs... we did it on the dyno for a comparison.. we took a few extra readings besides the HP.. we took back pressure, DB, and did a cost.. this was about 10 years ago... back then we were trying to get more power, quieter exhaust and low weight along with cost savings.... dont ask what the numbers were.. I dont recall... they were just numbers to me that had to be compiled to submit... all I remembered was the flowmax was on the bottom of the list for multiple reasons and HP was one
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Re: Mufflers... Any E.T gain from swapping?
[Re: MR_P_BODY]
#1573481
02/04/14 01:17 PM
02/04/14 01:17 PM
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Joined: Jan 2004
Posts: 4,866 North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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my 605 hemi was almost a tenth faster through the muffs. 4 inch straight pipes into borla XR1, turned down in front of rear ladder bar crossmember.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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