Re: h-pipe x-pipe or neither?
[Re: DartGTX]
#1335297
11/14/12 08:54 PM
11/14/12 08:54 PM
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Joined: Nov 2005
Posts: 15,119 85086
moparpollack
Lil Herman
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Lil Herman
Joined: Nov 2005
Posts: 15,119
85086
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Separate everything else is a pain to work on and not worth messing around for 5-7 hp.
56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
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Re: h-pipe x-pipe or neither?
[Re: RapidRobert]
#1335300
11/14/12 11:31 PM
11/14/12 11:31 PM
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Joined: Aug 2006
Posts: 8,064 Iowa
76dodgeboy
OP
master
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OP
master
Joined: Aug 2006
Posts: 8,064
Iowa
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I don't want it that quiet. Id drive open headers if I could but since it'll be my car to haul around our baby I can't have it header loud. But would like inbetween that and stock. I wanna hear in running. Ill have to post the one object YouTube
Last edited by 76dodgeboy; 11/14/12 11:32 PM.
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Re: h-pipe x-pipe or neither?
[Re: hp383]
#1335302
11/15/12 02:24 AM
11/15/12 02:24 AM
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Joined: Oct 2005
Posts: 6,048 Back home in PA
BulletBob
master
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master
Joined: Oct 2005
Posts: 6,048
Back home in PA
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Quote:
Quote:
I don't want it that quiet. Id drive open headers if I could but since it'll be my car to haul around our baby I can't have it header loud. But would like inbetween that and stock. I wanna hear in running. Ill have to post the one object YouTube
Remember that being a 5th Ave, it had a good amount of sound deadening padding, etc, throughout the interior panels. So a louder muffler wont be as loud inside (with windows up anyway)
You don't want it too quiet! I used to ride my kids around when they were really tired & let them washed out glass packs on my Charger rumble there butt right off to sleep
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Re: h-pipe x-pipe or neither?
[Re: 76dodgeboy]
#1335305
11/15/12 10:55 AM
11/15/12 10:55 AM
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Joined: Jan 2003
Posts: 9,892 Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,892
Weddington, N.C.
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If you want good MPG consider the flowmaster pulse tech header collectors and phase each bank 180 degrees for a 4 to 2 to 1, You Pair 7-1 and 3-5 on the Drivers and 8-2 and 4-6 on the Pass side....sounds pretty good too For mpg you want to keep the restrictions down but the VELOCITY up, you when cruising the motro is most responsive in that 35-75 MPH range and wherever your powerband falls for that speed. For max MPG I'd run generally the exaust system 1 trade size smaller than you would for max power. you may lose some peak power (maybe but doubtful) but you'll gain some effectively 'free' part throttle torque/MPG through the middle. This is generally how Mopar approached it from the factory BTW and in part why so many people were so happy with Chrysler's "passing power". FWIw the factory mopar dual exhausts of the 60's and early 70's were exceptionally well engineered for what they were. so don't reinvent the wheel....except for a better flowing muffler system.
Last edited by Streetwize; 11/15/12 11:06 AM.
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Re: h-pipe x-pipe or neither?
[Re: Streetwize]
#1335306
11/15/12 12:26 PM
11/15/12 12:26 PM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
Rug_Trucker
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,610
Not2farfromNashville, TN
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I rode in HotrodDave's mileage master 318 in his Cuda had TTI's straight pipes with an H pipe all the way out the back. It was a 273 2bbl cam. That car sounded sweet, and scared the Mustang boys.
The H pipe quieted my slant down.
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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Re: h-pipe x-pipe or neither?
[Re: dogdays]
#1335310
11/16/12 12:22 AM
11/16/12 12:22 AM
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Joined: Jan 2003
Posts: 12,043 State of Confusion
hp383
Just a normal tag again
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Just a normal tag again
Joined: Jan 2003
Posts: 12,043
State of Confusion
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The H pipe as i understand it, helps create a scavenging effect in the pipes, which helps with flow at higher RPM.
Since the car in question will be spending 90% or more of its time at 65 MPH +, then I would say it would be a benefit.
My 71 Newport with a factory 383HP motor, came with the high flow manifolds, and an H in the exhaust. It was only a 2-1/4" system, but im guessing it was there for a reason.
Join the Penguin Liberation Front!! Stop the Hippo Occupation!
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Re: h-pipe x-pipe or neither?
[Re: 76dodgeboy]
#1335311
11/16/12 12:45 AM
11/16/12 12:45 AM
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Joined: Jan 2003
Posts: 7,545 Albany, NY
67SATisfaction
The member whose name is actually Art
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The member whose name is actually Art
Joined: Jan 2003
Posts: 7,545
Albany, NY
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What MPG do you get now, or think you'll get?
If you're buying a new system, X will give you best economy by a slim margin, given that +HP = more efficient combustion = best fuel econ. Proper tune will factor much more into MPG.
But the money you'd save on gas might not equal the cost difference between a cheap stock system and the added cost of X or H.
ASSUME you might improve fuel econ about 5% - you would save 1 gallon for every 20gallons you buy. So what's the diff in cost for a new X exhaust system vs stock? $400? At $4/gal you'd break even after buying 2000gals of gas ($8,000 x 5% = $400). That's between 30-and40,000 miles of driving. Best, -Art
65 Satellite hardtop 361/4bbl console 727 2.76 67 Satellite convert 383/2bbl column 727 3.23 67 Lancia Fulvia Sport 1.3 Zagato. Alloy body, 1.3L V4 DOHC 4-spd 67 Lancia Fulvia Rallye 1.3. Alloy panel, 1.3L V4 DOHC 4-spd 71 Alfa Romeo GT Junior 1300 Zagato, 1.3L 4cyl DOHC hemi 5-spd 82 Alfa Romeo GTV6 2.5L SOHC hemi V6 5-spd transaxle 75 Maserati Bora US spec 4.9L DOHC hemi V8 5-spd ZF 77 Maserati Khamsin Euro spec 4.9L DOHC hemi V8 5-spd ZF 07 Aston Martin DB9 6.0L DOHC V12 6spd transaxle
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Re: h-pipe x-pipe or neither?
[Re: hp383]
#1335314
11/16/12 01:42 AM
11/16/12 01:42 AM
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Joined: Aug 2006
Posts: 8,064 Iowa
76dodgeboy
OP
master
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OP
master
Joined: Aug 2006
Posts: 8,064
Iowa
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Quote:
The H pipe as i understand it, helps create a scavenging effect in the pipes, which helps with flow at higher RPM.
Since the car in question will be spending 90% or more of its time at 65 MPH +, then I would say it would be a benefit.
My 71 Newport with a factory 383HP motor, came with the high flow manifolds, and an H in the exhaust. It was only a 2-1/4" system, but im guessing it was there for a reason.
I plan to they and drive between 60-70mph depending on which gets optimal mileage
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