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Unread 10-07-2013, 06:21 PM   #1
345HemiJeep
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6.4 hemi intake on a 5.7 hemi

Hey, doing some research and haven't found much on the web. I know the 6.4 hemi is based off of the 5.7, so I was throwing the idea around of putting a composite intake from the 6.4 and bolting it on to my hemi. Any ideas on if this will work or not? Anyone done this yet? Thinking of gaining a few ponies from easier breathing as well as making the front a little lighter! Thanks for any insight!

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Unread 10-07-2013, 11:17 PM   #2
chmo
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IF(?) it bolts on it does not necessarily mean that you can get around a custom pcm tune!
Besides the flow characteristics and the volume there are some small details like throttle body and the sensors coming with it which most likely will confuse your pcm ... (and will give the tuner some good times ).
Changing your CAMs comes to mind as well ...

in short: this is not a garage bolt on mod!
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Unread 10-08-2013, 04:15 PM   #3
sduncan
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I wouldn't even attempt it. I have a feeling that almost all of the accessories on the front of the motor will have to be changed/moved which will in turn cause a lot more issues...it just wouldn't be worth it.

If you want more HP then cam it and get a little mild head work done. That should be good for 50-70 hp. Otherwise, look into a blower kit.

http://www.shophemi.com/c-1276-hemi-power-adders.aspx
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Unread 10-08-2013, 08:45 PM   #4
TJJP77
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The 6.4L is based off of the 2009 or newer 5.7L Hemi and the manifold would bolt up. If your Hemi is a 2008 or older, the 6.1L manifold should be a direct bolt up, but I'm not sure if the 6.4L manifold will fit the earlier Hemis.

Regardless of fit, the 6.4L manifold has a solenoid actuated short runner valve (SRV) that changes the effective length of the intake runners depending on engine RPM. You would need to find a way to actuate this valve at the proper RPM or you wouldn't be getting much benefit out of the swap.
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Unread 10-08-2013, 08:50 PM   #5
Blown7
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Quote:
Originally Posted by 345HemiJeep View Post
Hey, doing some research and haven't found much on the web. I know the 6.4 hemi is based off of the 5.7, so I was throwing the idea around of putting a composite intake from the 6.4 and bolting it on to my hemi. Any ideas on if this will work or not? Anyone done this yet? Thinking of gaining a few ponies from easier breathing as well as making the front a little lighter! Thanks for any insight!
It's been done, check IIRC for a forum poster Hemmisary on the LX Forums.

Not much super high tech goes on in this forum.
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Unread 10-09-2013, 05:48 AM   #6
345HemiJeep
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Thanks for all of the info. Yeah, just looking into future options and all. You would think 400 horses in a TJ would be enough, but there are days...
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