Re: Dyno Headers: Adjustable Primary Length Range?
[Re: gregsdart]
#1865868
07/07/15 02:16 PM
07/07/15 02:16 PM
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Joined: Mar 2003
Posts: 9,100 Rogue River, OR
Jeremiah
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Posts: 9,100
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Thanks Greg. The wallace site was about 31" for my 511 so I figured I'd start with that.
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Re: Dyno Headers: Adjustable Primary Length Range?
[Re: Jeremiah]
#1866413
07/08/15 09:18 AM
07/08/15 09:18 AM
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Joined: Jan 2003
Posts: 10,016 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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Frostbitefalls MN (Rocky&Bullw...
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Another option is to buy a small block chevy weld it yourself header kit and use the Mopar BB head flange. Cheaper, and you can get smaller sizes of tube.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Dyno Headers: Adjustable Primary Length Range?
[Re: Jeremiah]
#1866442
07/08/15 10:29 AM
07/08/15 10:29 AM
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Joined: Jan 2003
Posts: 16,930 NC
440Jim
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I was planning on running 2-2.125"x4" TTI's. What length (avg) are the TTIs for comparison? It would be interesting to test the TTI length with your new dyno headers (2.25) for comparison.
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Re: Dyno Headers: Adjustable Primary Length Range?
[Re: 440Jim]
#1866524
07/08/15 01:05 PM
07/08/15 01:05 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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I was planning on running 2-2.125"x4" TTI's. What length (avg) are the TTIs for comparison? It would be interesting to test the TTI length with your new dyno headers (2.25) for comparison. IIRC, the TTI 2" to 2-1/8" step headers have a 3.5" collector, same as their standard 2" like I run. IMO, a 4" collector is way too big for a 2" tube, and maybe even borderline for a 2-1/8". I had some Headers by Ed documentation years ago that was really "picky" on how it sized collectors based on tube diameters and applications. Ol' Ed was into sizing collectors in 1/4" increments, rather than the common 1/2" size changes. Although the TTI 2" to 2-1/8" step headers do not have the identical tube lengths as mine, I can tell you the 2" TTI B/E-body header have a really wide range in tube lengths (from about 25" to 41") that AVERAGE to approx. 32". They're the epitome of UNequal length as a result of being "designed to fit", rather than "designed to peform". Still, they still seem to work OK. I wish TTI made a 1-7/8" to 2" step for B/E-body, but will stick w/ my standard 2" since I don't see my combination needing anythying bigger. FWIW, Steve Dulcich did a header comparison article some years ago where two of the headers tested on his old EMC Chapman-headed 470 B engine (700+ HP) were the Hooker 2" Super Comps (very close to equal-length primaries) and the TTI 2" to 2-1/8" step headers. There were REALLY close across the entire power curve, with the TTI averaging something like only 1/2 or maybe 1 HP more.
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Re: Dyno Headers: Adjustable Primary Length Range?
[Re: Jeremiah]
#1866539
07/08/15 01:15 PM
07/08/15 01:15 PM
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Joined: Jan 2012
Posts: 2,678 Stuttgart, Arkansas
rickseeman
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Stuttgart, Arkansas
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I never have understood people using dyno headers. If you want an idea of what your engine really makes when you use it, instead of on a dyno, I don't think you want dyno headers or a deep dyno pan.
2011 Drag Pak Challenger
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Re: Dyno Headers: Adjustable Primary Length Range?
[Re: rickseeman]
#1866542
07/08/15 01:23 PM
07/08/15 01:23 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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I never have understood people using dyno headers. If you want an idea of what your engine really makes when you use it, instead of on a dyno, I don't think you want dyno headers or a deep dyno pan. I agree that you should test w/ what you'll actually run as closely as possible. In my case, I had to bring along a set of Hooker 2" Super Comps because they fit the dyno cart, but my more "chassis-fit friendly" TTI 2" headers wouldn't.
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Re: Dyno Headers: Adjustable Primary Length Range?
[Re: BradH]
#1867100
07/09/15 08:45 AM
07/09/15 08:45 AM
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Joined: Jan 2003
Posts: 10,016 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I never have understood people using dyno headers. If you want an idea of what your engine really makes when you use it, instead of on a dyno, I don't think you want dyno headers or a deep dyno pan. I agree that you should test w/ what you'll actually run as closely as possible. In my case, I had to bring along a set of Hooker 2" Super Comps because they fit the dyno cart, but my more "chassis-fit friendly" TTI 2" headers wouldn't. Start with the dyno stuff, tune and get the fuel/air data, switch to what you are going to run and retest. That is what I would do, but they said they couldn't hook up to my headers due to the curved collector exit.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Dyno Headers: Adjustable Primary Length Range?
[Re: Jeremiah]
#1868333
07/11/15 05:45 PM
07/11/15 05:45 PM
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Joined: Jan 2003
Posts: 31,073 Oregon
AndyF
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I Win
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Oregon
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You guys are right on target as to why I can't use the headers that will be in the car. I seriously doubt the TTI's will fit on the dyno. I ordered up the Shcoenfeld set so we shall see. Which headers did you order from Schoenfeld? If you buy them from Summit the shipping is free. Price is the same as direct from Schoenfeld. If you got the 1 7/8 - 2 inch headers I might want to try them out some time. Or buy them from you after you use them on the dyno if you don't plan to keep them.
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Re: Dyno Headers: Adjustable Primary Length Range?
[Re: Jeremiah]
#1868415
07/11/15 08:34 PM
07/11/15 08:34 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Romeo MI
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I used my complete engine on my last dyno session.. my headers that I built for the car, my fuel... worked out great Get the Pipe Max program.. you cant go wrong... been using that program for 20+ years and even tried to mess it up to see how much power was lost
Last edited by MR_P_BODY; 07/11/15 08:39 PM.
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