Questions about my 2003 5.7 Stroker build , Compression Ratio, PCM - Hemi Truck Club
 
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Old 06-19-2017, 04:31 AM   #1
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Questions about my 2003 5.7 Stroker build , Compression Ratio, PCM

Questions about my 2003 5.7 Stroker build , Compression Ratio, PCM
Hi Guys,
Been reading this since I bought my 03' Ram 7 years ago, but never really had the need to post a question till now.
I am in the process of ordering a stroker kit for my 5.7 hemi , and the question of how much compression can I run with a stock 03 PCM and a Superchips 91 tune . I blew up a piston at 253K miles and am going to get a stroker motor to go in. The build is for a Daily Driver 03 RCSB , lowered 2/4 , hauls a few tools around, and a 20' SeaRay a couple times a year. This truck has to be dependable in the northwest, temps from 100 down to 20 degrees, rain , snow, I wanted a 370 stroker but all the builders are backed up for 2-3 months and I need one quick, like 30 days.
Quickest choice is a 392 stroker from a 5.7 block.
Manley Stroker rotating assembly
Pistons ??? what CR can I run ??
Comp Cams 260 (beats most cams out there until 4,800 rpm)
Pushrods 6.1 pushrods ???
PAC 1218 springs / Pac locators
5.7 heads , minor exhaust port matching to my long tube headers, Just a cleanup mill to the heads .005"
It has the original 545rfe in it, with the Transgo HD-2 kit in it, resistor added, PLUS I am also running the sonnex line booster, yellow wire delete at tcm, works well . I have no plans for a converter, I drive 150 miles a day and this is my work rig, needs to get decent gas mileage, and be dependable for another 50K miles , and be able to hold it's own against any Beemers or Rice Burners that want to cut me off !!!!
So whats a safe compression ratio ? 10:1 , 10.25:1 / 10.5:1 ???
Possible PCM issues ?
Pushrods ?
Thank You

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Old 06-19-2017, 11:15 AM   #2
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Old 06-19-2017, 01:39 PM   #3
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The 03 pcm is your main hurdle with no idle control. Now with all the 05 pcm swaps documented its a easy swap. Its the cheapest way to get the tuning you want. For a na motor and our aluminum heads i see 10:25 cr good on pump gas. A cam considered as big in a 5.7 will get swallowd on a stroker motor. A Manley kit is recognized as a good kit. I recommend Cometic gaskets for all gaskets period. Any torque to yeld bolt id replace with ARP studs. 6.1 push rods are a good replacement for a 6.1 based cams. 6.1 timing chain and oil pump. Using standard motor building practise you cant go wrong. Good luck..
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Old 06-19-2017, 04:10 PM   #4
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Old 06-19-2017, 04:18 PM   #5
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Quote:
Originally Posted by Redtruck-VA View Post
The 03 pcm is your main hurdle with no idle control. Now with all the 05 pcm swaps documented its a easy swap. Its the cheapest way to get the tuning you want. For a na motor and our aluminum heads i see 10:25 cr good on pump gas. A cam considered as big in a 5.7 will get swallowd on a stroker motor. A Manley kit is recognized as a good kit. I recommend Cometic gaskets for all gaskets period. Any torque to yeld bolt id replace with ARP studs. 6.1 push rods are a good replacement for a 6.1 based cams. 6.1 timing chain and oil pump. Using standard motor building practise you cant go wrong. Good luck..
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Old 06-19-2017, 04:30 PM   #6
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I thought the pcm was a nightmare ? I read an 03 to 05 swap, it was 10's of pages long , using whole wiring harnesses, vin problems, key problems
Donor trucks , wrong connector ends . It sounded HORRIBLE to me. But maybe it was an old post and they have it figured out to an adapter harness ??
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Old 06-19-2017, 04:37 PM   #7
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Quote:
Originally Posted by Redtruck-VA View Post
The 03 pcm is your main hurdle with no idle control.
This is the biggest problem. This has to be addressed first. Trust me on this. I'm the one that learned this the hard way twice that an 03 pcm can't be tuned for a stroker engine. It only gets worse when you add a turbo in the mix.
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Old 06-19-2017, 05:02 PM   #8
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I believe I followed/read that thread on here. You took a lot of crap holding on to that 03 pcm as long as you did ? I'm just mechanically competent BUT electrically challenged. So tell me it's easier than what I described now ?? Like a harness that any inept idiot can install without taking apart the dash, seats, window buttons, airbags and anything else that uses voltage !!!!
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Old 06-19-2017, 05:10 PM   #9
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I have a stand alone transmission, so mine was super easy with needing only the second o2s (3 wires and grounding two.
The most difficult part of the swap is moving the wires from the 03 TCM to plug c4. And its something like 28 wires. I suggest going to the salvaged yard and cutting a c4 plug with about 6-8 inches of wires hanging off it. Then label each wire and the final step is just matching up the wires, soldering them and shrink wrapping.
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2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
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Old 06-19-2017, 05:11 PM   #10
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This is where the info is at. Greg and Keith can walk you through it.

http://www.hemitruckclub.com/forums/...wap-16322.html
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