Hemi guys - Hemi Header collector qun
#1395470
03/01/13 09:54 AM
03/01/13 09:54 AM
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Joined: Sep 2005
Posts: 620 Deep DEEP SOUTH
LAD 524
OP
mopar
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OP
mopar
Joined: Sep 2005
Posts: 620
Deep DEEP SOUTH
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Guys I can fit 2.25" TTI headers into my car easily enough. My question is: will a 3.5"collector be enough for a 6500rpm max 572" N/A Hemi ? Engine makes 845HP/770TQ on pump gas. TTI make a 4" collectored header but that is only for the Indy 426-1RA head, and Im running a set of Indy 426-1 head. So, am I better off with a 4" collector or will 3.5" be sufficient ? Any experience with this would be great ! Thanx
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Re: Hemi guys - Hemi Header collector qun
[Re: LAD 524]
#1395471
03/01/13 01:30 PM
03/01/13 01:30 PM
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Joined: Jul 2010
Posts: 3,502 SOUTH JERSEY
HEMIFRED
master
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master
Joined: Jul 2010
Posts: 3,502
SOUTH JERSEY
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are you running mufflers ? if so what size pipe and mufflers
home of the Sox and Martin Hemi Duster
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Re: Hemi guys - Hemi Header collector qun
[Re: HEMIFRED]
#1395472
03/01/13 06:33 PM
03/01/13 06:33 PM
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Joined: Dec 2005
Posts: 293 Kansas City Metro
mbogina
enthusiast
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enthusiast
Joined: Dec 2005
Posts: 293
Kansas City Metro
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in my opinion, 3.5 is way too small for a 572. with a 426/7200 rpm/765 hp motor w 2.25 primaries, we saw 8HP improvement w 4" vs 3.5"
Be a Rebel- Break the Laws of Physics!
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Re: Hemi guys - Hemi Header collector qun
[Re: mbogina]
#1395473
03/01/13 11:26 PM
03/01/13 11:26 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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Quote:
in my opinion, 3.5 is way too small for a 572. with a 426/7200 rpm/765 hp motor w 2.25 primaries, we saw 8HP improvement w 4" vs 3.5"
... I run a 3.5" on my SB.... you need 4" or possibly more(dependent on the revs)
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Re: Hemi guys - Hemi Header collector qun
[Re: LAD 524]
#1395478
03/02/13 09:49 AM
03/02/13 09:49 AM
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Joined: Dec 2005
Posts: 1,495 Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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With all the trouble to go threw you think you will ever feel that maybe 8 HP loss on a street car???? You already have more than you need!!!! Just my 2cents.
JAKES AUTOMOTIVE
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Re: Hemi guys - Hemi Header collector qun
[Re: DusterDave]
#1395485
03/03/13 10:08 AM
03/03/13 10:08 AM
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Joined: Dec 2005
Posts: 1,495 Shelby mi.
JAKE68
pro stock
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pro stock
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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Unless you are trying all different exaust combo's and measuring results you have no idea what your gains or losses are. That 8 hp loss was on someone else's combo. you dont have a clue what yours are. It may make less but make more torque. Unless you are running a heads up class just adjust the hp loss with the dial in on the window. That is allot of expence for the small gain.
JAKES AUTOMOTIVE
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Re: Hemi guys - Hemi Header collector qun
[Re: JAKE68]
#1395486
03/03/13 02:35 PM
03/03/13 02:35 PM
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Joined: Jan 2003
Posts: 12,074 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,074
Benton, IL.
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We have to run full exhaust in our KOS series here, so we have played around a lot with our exhaust. Not to say we know everything, but in my experience the exhaust system is way more of a power robber than the headers themselves. We have tried a lot of different exhaust combos on the Cuda and in the end I just put electric cut-outs on it. That way it is quiet enough to keep the cops off my butt while in town. 3 1/2" or 4" exhaust was just so large, cumbersome and expensive, that it was just not practical. Besides, no matter what I tried, it robbed HP. And a lot more than 8 HP. I run 3 1/2" to the dumps and then 3" on out the back. Much easier, cleaner, cheaper and no clearance issues. Besides, I can make it as loud as I want any time I want.
Master, again and still
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Re: Hemi guys - Hemi Header collector qun
[Re: DaveRS23]
#1395487
03/04/13 02:07 AM
03/04/13 02:07 AM
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Joined: Sep 2005
Posts: 620 Deep DEEP SOUTH
LAD 524
OP
mopar
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OP
mopar
Joined: Sep 2005
Posts: 620
Deep DEEP SOUTH
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Good info fellas. Dave, Thats what Im planning to do if I stick with the 3.5" collector run 3.5" pipe to the mufflers then after the mufflers when the gases have cooled sufficiently, step down to 3" over the rear end then another pair of 3" in/out mufflers at the rear of the car for further noise control as I have the space. I may also experiment with alum tubing and possible oval tubing and use electric cutouts to further reduce the noise if reqd. Here's food for thought, I just confirmed with my dyno guy, the combo made 850HP at 6300rpm and 770TQ at 5300rpm with 2 1/8" Dyno headers with a 3.5" collector Interesting.
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Re: Hemi guys - Hemi Header collector qun
[Re: LAD 524]
#1395488
03/04/13 10:55 AM
03/04/13 10:55 AM
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Joined: Jan 2003
Posts: 12,074 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,074
Benton, IL.
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Just to be clear; I run 3" after the cut-outs. With the cut-outs, the extra 1/2" exhaust pipe diameter just doesn't matter. I can crack open the cut-outs just a little and get the same results without being too loud if I want. With cut-outs you can concentrate on the exhaust system's cost, fit, and sound. Instead of the quest for maximum flow causing all kinds of problems. And did I say how much FUN cut-outs are? I will never have another muscle car without them.
Master, again and still
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