2003/4 ECM programing vs 2005/6 - Rubicon Owners Forum
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post #1 of 28 (permalink) Old 09-20-2018, 10:06 PM Thread Starter
Rubi Noobie
 
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2003/4 ECM programing vs 2005/6

Can anybody tell me why the 2003 and 2004 jeeps ECM doesn't work well with aftermarket programmers? And is it possible to swap-install the 05 or 06 ECM.....Looking for a little more performance.
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post #2 of 28 (permalink) Old 09-21-2018, 09:32 AM
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The difference between the 03/04 and 05/06 PCM is the transmission control module (TCM) is a stand alone module in the 03/04 model years. I think the only reason to do a custom tune is if you went to bigger injectors and different MAF sensor if you supercharged. Always the best way to start when looking for better performance is to regear.

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post #3 of 28 (permalink) Old 09-21-2018, 09:48 AM Thread Starter
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I am very happy with my rig the way it is here in FLA. Planning on traveling out west Moab , Monument Canyon.ETC.. and will be pulling a 5 wide [email protected] approx. 12000 lbs. I am concern about pulling up the mountain grades and that has me thinking about a Banks Turbo kit. I am reading currently through ROF old post from back when Banks came out with the kit but I am just up to the 100th page or so.
Love to here how it would work on my 2003 Rubi 5 speed 33's and 4.10's. I guess I should have just posted that..........YAR!!
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post #4 of 28 (permalink) Old 01-24-2019, 02:27 AM
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If your's is programmed like mine the timing is horribly low. Level ground interstate it only has about 30 degrees timing. When going up any kind of hill and timing drops to low 20's and at wot at 2800 rpm it is at 16 degrees. As the throttle is opening any extra airflow is negated by reduced timing. It seems like after 1/3 throttle there is no difference in power.

I've heard Syked has software to tune 03-04 Wranglers. I think it is very similar to HP tuners software. I hope to get Syked software in the next month and see what gains can be had by playing with the timing tables. I may DIY a turbo if it still struggles on hills with a 1700lb trailer.
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post #5 of 28 (permalink) Old 01-24-2019, 09:58 AM
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Welcome Brian! Some ROFers have Banks turbos, one has a Kenny Bell blower, I have a RIPP blower kit and another guy has another brand of blower kit.

The very first improvement for power is regearing - what size tires and what gear do you have?

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post #6 of 28 (permalink) Old 02-01-2019, 02:19 PM
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Regearing is on the list. It has 4.10s still with 35s. 5.38s are coming soon. I'm not expecting much improvement at 70 mph because I'll be in overdrive at 2500 rpm vs 3rd gear at 2800 rpm now. On the interstate it may be a step back, but around town should be much better. I think with some tuning it will be great in Tennessee, but pulling a trailer in mountains will be right lane only.

I'll be going to an off road park in late March with a decent climb at lower altitude. I'll see how it goes then.
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post #7 of 28 (permalink) Old 02-02-2019, 12:44 AM
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Quote:
Originally Posted by johncanfield View Post
….The very first improvement for power is regearing - …
Yes...

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Originally Posted by Brianj5600 View Post
Regearing is on the list. It has 4.10s still with 35s. 5.38s are coming soon....
OMG! That has to be a dog. I have an '04 w/5 speed tranny. Went from stock 31" tires to 33's and lost fifth gear. When I put on 35's I re-geared to 4.88... Much better! 35's with 4.88 is actually just a little bit lower than (stock) 31's with 4.10.
Are you sure you want to go as deep as 5.38? I would think 4.88 would be fine or 5.13 with auto tranny.

Get rid of the re-programmers and anything changing PCM parameters/timing until you re-gear.
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Last edited by geroux; 02-02-2019 at 12:47 AM.
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post #8 of 28 (permalink) Old 02-02-2019, 09:42 AM
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5.38 gears work quite well with an automatic tranny and 35 or 37s. Different ball game with a manual tranny.

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post #9 of 28 (permalink) Old 02-03-2019, 12:54 AM
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I'm also running 4.88's and 35's with the NV3550 5 speed stick.
Runs great.

'02 TJ Sport, ARB's, 4.88s, NV241, Nth 6in LA, D44's, 35in KM2's, rear discs, Antirocks,
Warn XD9000i, Superior Evolution, and caught fire only once, N7YMZ
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post #10 of 28 (permalink) Old 02-03-2019, 03:34 AM
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Quote:
Originally Posted by geroux View Post
Yes...



OMG! That has to be a dog. I have an '04 w/5 speed tranny. Went from stock 31" tires to 33's and lost fifth gear. When I put on 35's I re-geared to 4.88... Much better! 35's with 4.88 is actually just a little bit lower than (stock) 31's with 4.10.
Are you sure you want to go as deep as 5.38? I would think 4.88 would be fine or 5.13 with auto tranny.

Get rid of the re-programmers and anything changing PCM parameters/timing until you re-gear.
It does not feel like a dog at all at speeds below 60 mph. Above that, it is a dog, especially in the summer. I don't have a re-programmer and have no plans to get one. I am buying tuning software to allow full control over the tune.

I really don't think it will get any better on the interstate without a retune. I currently don't use OD and RPMs are 2750 @ 70 mph. With 5.38s using OD, RPMs will be 250 lower than current form at 70 mph. I would not expect that work better than what I have now. Using 3rd with 5.38s would be a little over 3600 RPMs at 70 mph. I don't want to travel long distances like that.

To be clear, I don't think tuning can replace regearing.

Black 2004 TJR
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