5.7 hemi research

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    Author Topic: 5.7 hemi research  (Read 3654 times)

    Offline peterro

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    5.7 hemi research
    « on: November 08, 2008 - 01:52:52 AM »
    Hello all,

    I'm looking at getting a 5.7 hemi for my Challenger project.  It'll probably be from a truck.  Are there years that I should be looking for or staying away from?  Since much of all of our projects are about looks, I like the look of the 6.1 intake and have seen similar on the 06-08 engines.  Is the intake the same on all of them?

    I do want to stay with fuel injection which is why I'm doing the research.  What do I need from the truck or from somewhere else to get it to work?  I imagine the wiring is the most challenging.  I'll be using my existing small block 727.  The other things I was wondering about was the trans kickdown and the throttle control.

    Thanks
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    Offline Chryco Psycho

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    Re: 5.7 hemi research
    « Reply #1 on: November 08, 2008 - 04:26:55 AM »
    The 5.7 used a different intake system , I do not know of a bad year for them , the wiring wqill be the biggest challenge , Mopar & others have a stand alone computer to run the engine without the rest of the truck wired to it
     you will need a custom throttle & kickdown cable possibly Bouchillon or locar would work , the factory used a fly by wire system so there was no direct link between the pedal & throttle body , you will need a hgih pressure fuel pump fo rthe injection systen , you can go either in tank or frame mount
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    Offline peterro

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    Re: 5.7 hemi research
    « Reply #2 on: November 08, 2008 - 01:20:30 PM »
    Thanks.

    So what all would I need from the truck itself?  Just the engine and its harness?
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    Offline Chryco Psycho

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    Re: 5.7 hemi research
    « Reply #3 on: November 08, 2008 - 01:26:34 PM »
    the whole engine , I think the harness a computer from Mopar replaces the existing truck harness completely , hopefully some other will jump in here , but I believe the factory harness is redundant
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    Offline peterro

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    Re: 5.7 hemi research
    « Reply #4 on: November 08, 2008 - 01:52:35 PM »
    Thanks.  I'd probably want the alternator, ac pump, ps pump, starter etc too.  The Mopar harness will come with those connectors?
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    Offline 'Cuda Hunter

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    Re: 5.7 hemi research
    « Reply #5 on: November 08, 2008 - 01:57:30 PM »
     :popcorn:     :popcorn:      :popcorn:       :popcorn:       :popcorn:      :popcorn:

      I have the same questions. 
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    Offline Chryco Psycho

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    Re: 5.7 hemi research
    « Reply #6 on: November 08, 2008 - 03:33:53 PM »
    I would / did take everyhting , you can always toss it later on
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    Offline gkring

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    Re: 5.7 hemi research
    « Reply #7 on: November 08, 2008 - 04:55:32 PM »
    look for the earlier Hemis that did not have the multiple displacement setup. They are easier to swap cams and deal with the computer in retrofits.Other than that you would want a 5.7 car intake instead of the truck intake. A 6.1 intake can bolt up, but you have to port the 5.7 heads bigger to match or swap to the 6.1 heads. Decide what computer you are going to use first, then pick the harness to match. The Mopar stuff isn't a very bad deal if you buy the whole crate motors and matching computers.
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    Greg
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    Offline thedodgeboys

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    Re: 5.7 hemi research
    « Reply #8 on: November 08, 2008 - 07:12:52 PM »
    If you use the car intake or the 6.1 you need to change over to the car mounting points for all the accessories the truck mounts the alt and AC up high and interferes with the throttle body.

    Get the harness and PCM if you can some places upgrade your existing one some will sale you a new one better be safe than sorry.
     :bigsmile:

    http://www.cuda-challenger.com/cc/index.php?topic=31666.45

    check out the link for some good install info...
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    Offline peterro

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    Re: 5.7 hemi research
    « Reply #9 on: November 08, 2008 - 08:58:08 PM »
    Are all the accessories (a/c, alt, ps etc) the same from the truck to car?  Will the truck accessories work with the car mounting HW?

    I have a friend who wants to go in with me on a truck, I get engine stuff, he gets the body.  I don't think I'll need the trans and it sounds like what I'll need in addition to the engine is the car mounting hw, car intake manifold, car serpentine system, and a mopar computer/wiring harness.  Does that sound about right?

    Trying to come up with the right list to determine how much I want to spend on this deal.
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    Offline thedodgeboys

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    Re: 5.7 hemi research
    « Reply #10 on: November 08, 2008 - 09:20:25 PM »
    you can use the truck stuff just use the truck intake with it.

    Thats what mopar sales for there crate 5.7's

    I dont know about the AC but all the others will bolt up.

    good list take the trans and use it for trading stock.  :thinkerg:

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    Go Fast & Have Fun...
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    Offline 71bigblock

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    Re: 5.7 hemi research
    « Reply #11 on: November 09, 2008 - 09:51:09 PM »
    Dont get an '03, I heard of valve spring problems.  And the '03 computer system uses a separate computer for tranny and computer, while '04 up uses only one computer. 

    I kinda learned everything on the go, and I dont really regret it. 

    PS, if you need a flywheel clutch setup, please let me know, the one that is pictured in my thread that dodgeboys posted did not work with my truck 5 speed.  I still have it, and dont need it.  That mopar flywheel is over $300.   :faint:  I'll make you a deal, it is all brand new, just bolted and unbolted it.   :2thumbs:
    « Last Edit: November 09, 2008 - 09:56:10 PM by 71bigblock »
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