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  #145  
Old 10-10-2016, 07:34 PM
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5.7L American Racing Headers!

We're all here to try to help each other out.
On another note I see your into bodybuilding? Same here, recovering from a back injury. Just started back up at the gym a week ago after not being able to train for two years


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  #146  
Old 10-10-2016, 08:54 PM
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Originally Posted by wkjoe79 View Post
We're all here to try to help each other out.
On another note I see your into bodybuilding? Same here, recovering from a back injury. Just started back up at the gym a week ago after not being able to train for two years

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Nah bro, military here so no need for body building. Got a bad back from a 2011 injury and my rotator in my right shoulder is shot so i cant lift like i did in high school. So i run alot
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  #147  
Old 10-10-2016, 09:00 PM
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Re: 5.7L American Racing Headers!

Respect buddy! I feel your pain...two herniated discs in my lower back


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  #148  
Old 10-10-2016, 09:20 PM
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Respect buddy! I feel your pain...two herniated discs in my lower back

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I feel ya, my dad has a herniated disk in his back as well. I see the pain.
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  #149  
Old 10-10-2016, 10:01 PM
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Re: 5.7L American Racing Headers!

It ain't easy but tinkering with cars, bikes and the limited gym time help keep a man sane! Oh and some pain killers!lol


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  #150  
Old 10-10-2016, 10:16 PM
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Re: 5.7L American Racing Headers!

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Originally Posted by wkjoe79 View Post
Now now boys let's not get our panties in a bunch!��
Micheal there may not always be "hard evidence" to support the things we do cause we don't all have Dyno's or the budget available. Fact is most of us use seat of the pants Dyno and if many members and tuners agree on a certain topic we tend to believe it and go ahead with the mod. The exhaust system can only increase power so much through velocity and a scavenging effect but it can free up some trapped power and I think that's where the most confusion occurs when we talk about this topic.


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wkjoe79,
I have no issue with Strongjeff, but if he has one with me then that's his issue and not mine.

Back in the day as a member on multiple race car teams we relied heavily on data acquisition for what we did. Without it, we wouldn't have been successful as we were. I have an electronic engineering degree and at work I rely on hard data for what I do. So maybe its the engineer in me, to look for data and not hearsay no matter how many people say so. There was a time when some people thought the world was flat until it was proven it wasn't.

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  #151  
Old 10-10-2016, 10:39 PM
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Re: 5.7L American Racing Headers!

Here is a screenshot from a dyno test by JBA on a 5.7L engine. Granted it's not on an AWD Jeep where the drivetrain loss will be slightly greater. I have no idea if those vehicles (Challenger, Charger, etc.) share the same exhaust manifold design or tubing size but it's data that warrants a closer look. Area underneath the curve has increased and both peak HP and TQ numbers were improved too.

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  #152  
Old 10-10-2016, 11:51 PM
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Originally Posted by Michael Plummer View Post
Here is a screenshot from a dyno test by JBA on a 5.7L engine. Granted it's not on an AWD Jeep where the drivetrain loss will be slightly greater. I have no idea if those vehicles (Challenger, Charger, etc.) share the same exhaust manifold design or tubing size but it's data that warrants a closer look. Area underneath the curve has increased and both peak HP and TQ numbers were improved too.
That test was done on the lx cars. The wk has smaller manifolds do to the space constraints. Therefore the gains would be greater in the wk.
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  #153  
Old 10-11-2016, 05:16 AM
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Re: 5.7L American Racing Headers!

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Originally Posted by Strongjeff View Post
That test was done on the lx cars. The wk has smaller manifolds do to the space constraints. Therefore the gains would be greater in the wk.
Strongjeff,
As usually thanks for the information. Do you know the stk. exhaust size tubing for those cars?

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  #154  
Old 10-11-2016, 05:28 AM
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Originally Posted by Michael Plummer View Post
Strongjeff,
As usually thanks for the information. Do you know the stk. exhaust size tubing for those cars?

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Its roughly 1/2 inch larger at the collector for the lx cars vs the wk. Jeepgcoman has done a direct comparison on this and can better explain it. Ive been trying to get him to post here since he has done upgrades to both his lx and wk with similar mods on both.

As for the stock tubing its i believe 2.75 inch.
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  #155  
Old 10-11-2016, 12:45 PM
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Re: 5.7L American Racing Headers!

Ok guys great news! I have been working with one of the vendors on the forum and have been able to put together a group buy for the American Racing Headers 5.7L for the WK1! He is willing to cut a decent discount and include free shipping so who wants in? I cant post the price but happy to share so send me a personal message if interested!
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  #156  
Old 10-11-2016, 04:44 PM
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Re: 5.7L American Racing Headers!

Wow, lots of info. and opinions on this thread....some good and some not so good. Jeff turned me onto this one and wanted me to give my input, for what it's worth.....which by the way isn't much. As he said, I have two Hemi vehicles (WK and LX) that are both modded exactly the same except the WK has a 90mm throttle body and the LX has and 85mm throttle body. Other than that, down to the custom modified SRT CAI's, they're the same.

I've been messing with almost any kind of internal combustion engines (from model airplanes, to autos, to aircraft turbines and everything in between) for longer than most of you have been alive.....well over 40 years. I've also, in the distant past, built race car chassis, racing transmissions and racing engines, so I feel I am at least a little qualified to put my TWO CENTS worth in here. A lot of stuff I'll say here has been covered in the 13 or so preceeding pages, and I agree with some of it and don't with others.....after all everyone is entitled to their opinions, even though they may be wrong.

Since this thread is about HEADERS, I'll first give you my opinion of their value on MOST newer vehicles, especially those with crappy exhaust manifolds and cat. backs, such as we have on our 5.7 Hemi's. I've not seen a much worse system on any factory semi performance vehicle as the one that came stock on our WK's. See the pix below for a comparison of the stock WK (left) 1.75 in. collector, stock LX (center) 2 5/8 in. collector, and my custom tubular headers (right) 3 in. collector that I had built over 5 years ago. If, along with an efficient low restriction cat. back, you don't think a well built header back system will make a significant improvement in engine performance (and economy), I am here to tell you that you're sadly mistaken. It's beyond me why Chrysler, or any other auto manufacturer would install a potentially serious performance engine in a vehicle and then CHOKE it up with a crappy exhaust system. After all, the engine is just an air pump, and the better the volumetic efficiency [VE] (the ability to process this air expressed as a %age), the better the engine will run, perform and provide better economy than one that is being strangled.

There are many other variables that enter into it too, not just the headers, to take into consideration when attempting to improve the VE. One needs to make sure the incoming air (intake system) is as unrestricted (and cool) as possible, cylinder heads/valves are properly sized, the valve timing (cam) is adequate for the desired purpose, the ignition system (coils/plugs/wires) is capable of delivering adequate spark at all operating RPM, and the exhaust (from header to tail pipe tip) is efficient enough to get rid of the spent gases with proper scavenging.....too small will restrict and too large will slow down the exhaust process. Our stock Hemi intake system (without the silencer and with an Airaid or SRT intake tube and a good low restriction air filter) is more than adequate to deliver more air than the STOCK 5.7 is capable of processing......which is less than 600 cubic feet per minute (CFM) at ~75-80% VE, or a little less than 660 CFM @ 100% VE. The stock airbox is capable of processing (ref: flow bench tests done on Hemi LX vehicles over on LXforums.com) just under 700 CFM.

I could go on and on here, but know that ANY GOOD LOW RESTRICTION HEADER BACK system that is properly set up on our Hemi WK's will deliver a quite noticeable difference in both performance and highway fuel economy, but in town mileage may not improve that much. On mine, with the current mods. (see signature), I routinely get 22-23 mpg (high of 24.41 mpg) on the highway and ~13-14.5 mpg in town. My quarter mile times have dropped more than a second from stock elapsed times.

Also, just installing a good header back exhaust system WILL NOT require a canned or custom tune, but also won't hurt any. With my mods. I've run the stock tune a couple times, just because everyone said it wouldn't work. It does work but is really crappy, as the stock tune can't take advantage of the better camshaft, higher RPM potential, and the transmission really doesn't like the additional power.....in fact it doesn't like the stock power either. IMO, if you want to make a noticeable improvement to your Hemi WK, the best place to start is the weakest link....the exhaust. If you want to go further, get a tuner (I prefer the Superchips with the Advanced Transmission Tuning Application), and further yet, add a cam. None of these mods. require a lot of work.....just $$$. The exhaust is, by far, the most costly.....my complete custom header back system ran ~$1400 about 5.5 years ago, the tuner about $400, and the cam/kit about $700-800. My dyno is the drag strip (I'd rather spend $$$ on mods. than dyno pulls), and I figure I've gained nearly 100 hp. as I am set up now. Next step for me would be a bigger set of heads, but they would be the most costly (~$2000) of all my mods. and only deliver about 30 more horsepower.
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File Type: jpg DSCN1268 (1320 x 990).jpg (268.5 KB, 10 views)
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