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Old 08-26-2015, 09:07 AM   #1
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03 Hemi VS 04 Hemi

I want to know what the differences in the 03 hemi engine vs the 04. The reason is because I am thinking about putting a pro charger and there is on for the 04. So I want to know if it will be OK to put it on my 03.

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Old 08-26-2015, 09:26 AM   #2
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Well, first To HTC!

Second, I don't know for sure but the reason they probably don't list the 03's for that item is the lack of tunability for the 03's.

I really do not think there is any difference engine wise between the 2.

But, someone may know more and will be by soon.
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Old 08-26-2015, 09:29 AM   #3
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Thank you.
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Old 08-26-2015, 09:49 AM   #4
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Old 08-26-2015, 10:06 AM   #5
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2003 if you don't cam it can be boosted relatively issue free since the idle won't need to be raised. The main thing fuel and Timing can be adjusted so you would be ok to run boost on a 2003. I would suggest make sure it has a blow off valve with a weak spring in it to reduce theottlw hangs and get a Diablo so it can be tuned. I could tune that for you. 2003 is not to be a scary year anymore they are plenty tamable even with some cams.
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Old 08-26-2015, 10:07 AM   #6
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The 03 has a single cat and no EGR valve. The 03 has a separate TCM from the PCM. The 04 has two cats, EGR valve and it's TCM is included in the PCM. The 03 was a one year PCM (NGC) and is tuned differently than the later models. The 03's are considered to be difficult to tune and/or very limited. There have been many 03's that have had superchargers or turbo chargers added. But have limited support with tuning. There is a IMES3 for sale on the forum that would greatly assist anyone using forced induction on a 03 plus we have Keith who is a CMR tuner that is very knowledgeable tuning 03's. You have come to the right forum for your project.
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Old 08-26-2015, 10:23 AM   #7
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^What he said. ^
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Old 08-26-2015, 02:46 PM   #8
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Old 08-26-2015, 05:39 PM   #9
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Go with boost. You'll never go back to anything else.
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Old 08-26-2015, 07:00 PM   #10
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