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  #121  
Old 10-08-2016, 03:39 PM
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Re: 5.7L American Racing Headers!

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Originally Posted by wkjoe79 View Post
Engine performance has nothing to do with th vehicle, it's about the power plant. We are discussing the added power the 5.7L Hemi can make not the vehicle it's in. I believe full less restrictive exhaust including headers, intake and CMR tune will net 50hp at the flywheel anything more will require a cam upgrade an so on. Just 20 years of expierience speaking here.
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Okay, I'll give you the power plant and not the vehicle to a point. Because there are plenty manufacturers like (BBK, Kooks, JBA, and Dynatech) who don't make an aftermarket set of headers for the Jeep 5.7L and there must be a reason why and that leads me back to the vehicle. Currently, I believe American Racing is the only one.

Getting back to a less restrictive exhaust system being beneficial. Yes, I agree if needed it will help but where is the proof that the stk. Jeep 5.7L exhaust manifolds are restrictive. You have 20 years of experience and you can't find any DATA to prove this debate one way or another...come on man.

I would love to purchase an aftermarket set of headers from American Racing and dyno test them with before and after passes. But I'm not going to spend $1600+ plus installation cost, dyno cost, and my time for little or no improvement on basically a stk. vehicle. I was told my cat-back exhaust system would add more HP and it didn't. That was a huge waste of money and I'd rather not repeat that process again.

With that said, there must be someone who has added headers to their 5.7L engine and backed it up with dyno results or is this what Jeep owners do....speculate on performance increases.

Thank you
Michael Plummer

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  #122  
Old 10-08-2016, 03:50 PM
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5.7L American Racing Headers!

Ok so I don't have flow charts on hand but after doing an easy search the stock exhaust system flows 306 cfm. An aftermarket set such as kooks long tubes with high flow cats flows 390 cfm on a 5.7L Hemi.
If I may the reason you were disappointed with your catback without me knowing the rest of your mods is due to the more restrictive front portion. Your exhaust can only flow as much as it's most restrictive part making your catback useless and disappointing
After that other things come into effect such as mentioned tune, intake, ci, heads, cam, intake manifold. It is one big recipe with a whole lot of math
FYI my 20 years experience is im mechanics not only Mopar


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  #123  
Old 10-08-2016, 03:51 PM
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Re: 5.7L American Racing Headers!

Here is a pic comparisonImageUploadedByJeepGarage1475959872.519474.jpgImageUploadedByJeepGarage1475959886.991457.jpg


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  #124  
Old 10-08-2016, 04:09 PM
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Re: 5.7L American Racing Headers!

Quote:
Originally Posted by wkjoe79 View Post
Here is a pic comparisonAttachment 72706Attachment 72707


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Exactly! Michael you cant possibly tell me that the stock manifolds are as good as a LT header setup.

it as I stated earlier in the thread that the stock manifolds are the biggest choke point. I even said I reduced my drag times by .3 tenths thru the 8th swapping the stock logs out for the short tubes I have. and that was on my v6 which has a similar manifold design despite me having over 100 c.i. less motor. you cant pick up that much gain unless its making more power.

I really wish Nikolai would dyno his, hes the only one I know of on here with these headers being discussed
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  #125  
Old 10-08-2016, 04:12 PM
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Re: 5.7L American Racing Headers!

Quote:
Originally Posted by Michael Plummer View Post
Okay, I'll give you the power plant and not the vehicle to a point. Because there are plenty manufacturers like (BBK, Kooks, JBA, and Dynatech) who don't make an aftermarket set of headers for the Jeep 5.7L and there must be a reason why and that leads me back to the vehicle. Currently, I believe American Racing is the only one.

Getting back to a less restrictive exhaust system being beneficial. Yes, I agree if needed it will help but where is the proof that the stk. Jeep 5.7L exhaust manifolds are restrictive. You have 20 years of experience and you can't find any DATA to prove this debate one way or another...come on man.

I would love to purchase an aftermarket set of headers from American Racing and dyno test them with before and after passes. But I'm not going to spend $1600+ plus installation cost, dyno cost, and my time for little or no improvement on basically a stk. vehicle. I was told my cat-back exhaust system would add more HP and it didn't. That was a huge waste of money and I'd rather not repeat that process again.

With that said, there must be someone who has added headers to their 5.7L engine and backed it up with dyno results or is this what Jeep owners do....speculate on performance increases.

Thank you
Michael Plummer
heres some proof. the wk manifolds are smaller then the lx manifolds (charger/challenger) due to packaging issues. they are physically smaller the the lx counter parts. why do you think the lx cars make more power? same goes for the ram which has a better intake manifold as well over the wk, it comes down to packaging in the wk being more constricted
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  #126  
Old 10-08-2016, 04:20 PM
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Re: 5.7L American Racing Headers!

Quote:
Originally Posted by Strongjeff View Post
Exactly! Michael you cant possibly tell me that the stock manifolds are as good as a LT header setup.



it as I stated earlier in the thread that the stock manifolds are the biggest choke point. I even said I reduced my drag times by .3 tenths thru the 8th swapping the stock logs out for the short tubes I have. and that was on my v6 which has a similar manifold design despite me having over 100 c.i. less motor. you cant pick up that much gain unless its making more power.



I really wish Nikolai would dyno his, hes the only one I know of on here with these headers being discussed

FYI the second picture are the OBXr longtube headers and highflow cats I just purchased for my WK1


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  #127  
Old 10-08-2016, 04:22 PM
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Re: 5.7L American Racing Headers!

Here's a link to my current winter build

Eagle heads on wk 5.7


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  #128  
Old 10-08-2016, 04:22 PM
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Quote:
Originally Posted by wkjoe79 View Post

FYI the second picture are the OBXr longtube headers and highflow cats I just purchased for my WK1

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I know man, i saw the post over on the "what did you do" thread lol. Good stuff
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  #129  
Old 10-08-2016, 04:23 PM
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Re: 5.7L American Racing Headers!

Thanks buddy


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  #130  
Old 10-09-2016, 01:48 AM
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Re: 5.7L American Racing Headers!

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Originally Posted by Michael Plummer View Post
Sweed,
Did I miss something? That engine had a few upgrades not sure how that helps the debate on how much aftermarket headers add in terms of HP.

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They did dyno after every add on so I think it do help in the "debate" you're having.
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  #131  
Old 10-09-2016, 07:04 AM
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Re: 5.7L American Racing Headers!

I wanna add one more thing. For anyone following my build they know I'm using eagle heads so I have the D shaped exhaust port. I purchased my OBXr SRT8 kit with high flow cats for 680$CND. My recommendation....get the srt headers which fit and are a true dual setup and with your money saved add a good free flowing catback system. You will be very pleased. Only hiccup would be a slight mod if you want to retain the egr system for emissions purposes but it's an easy mod and instructions are easy to find.


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  #132  
Old 10-09-2016, 08:41 AM
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Re: 5.7L American Racing Headers!

Quote:
Originally Posted by wkjoe79 View Post
Ok so I don't have flow charts on hand but after doing an easy search the stock exhaust system flows 306 cfm. An aftermarket set such as kooks long tubes with high flow cats flows 390 cfm on a 5.7L Hemi.
Thanks for the information.


Quote:
Originally Posted by wkjoe79 View Post
If I may the reason you were disappointed with your catback without me knowing the rest of your mods is due to the more restrictive front portion. Your exhaust can only flow as much as it's most restrictive part making your catback useless and disappointing
My setup is in my signature. Honestly I should of known better but my lack of information I have with this engine (5.7L) and how it reacts to modifications and wanting quick HP results made me lazy and I listened to the hearsay....again I should of known better. Which brings me to this point. Any aftermarket cat-back system will outflow the stk. OEM system but it doesn't translate into HP improvements on a basically stk. setup.

Quote:
Originally Posted by wkjoe79 View Post
After that other things come into effect such as mentioned tune, intake, ci, heads, cam, intake manifold. It is one big recipe with a whole lot of math
FYI my 20 years experience is im mechanics not only Mopar
Congrats on your 20 yrs of experience as a mechanic it has merit. But my experience comes from many years of drag racing, dyno testing, beta-tester for new performance parts and end user.

So let me repeat myself again, I agree with you, when other major components are added like a camshaft, intake, etc. a set of aftermarket headers will be beneficial. What I am hearing and not agreeing with is 20-30HP on a basically stk. engine and I'm including CAI, and tuner to that equation.


Not related but interesting enough: On my Mustang would you expect to see a 30+rwhp increase from swapping from one aftermarket muffler to another? I wouldn't and the same went for everyone else in the shop but it did and I have the dyno results to prove it. That's why testing is important because you never know without some kind of testing to back it up.


Thanks
Michael Plummer
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