What can and can't be tuned? LSx Swap

[MCMLXIX]

I picked up a 2005 LQ9 from a Denali. No harness but it came with a PCM from a 2004 Yukon 4X4, Service Number 12586242. I will be running a 4L80e from a 2005 Silverado and a 1991 NP205 transfer case with a VSS on the output. (I have the vin for the PCM somewhere & I can post it if it helps)

I found someone local to build a harness and tune the PCM, but I don’t know what software they use. I dont want to sound like an idiot when I go over there, I want some knowledge of what can and cant be done.

Questions?

1. Does it matter what software the tuner has? As an example, does EFI Live give you more options then HP Tuners? Is there anything that can only be done by a GM dealer?

2. I heard I need a segment swap as the PCM should have a tune for a 4L60e and I will be running a 4L80e. Should be simple for any tuner, right...

3. Do different operating systems offer different features. I'm pretty sure that becasue of the PCM I have it shouldn't be an issue, but the more I read the less I know...

3. I know a 4WD tune is different from a 2WD tune. I know that some PCMs (or a tune) will support a 4WD Low signal (to ground?). This tells the PCM to adjust trans shift points because the transfer case changed the final gear ratio. Is it the PCM or the software? If it’s the PCM, what pin would it be? If it’s software, is it a segment or a operating system? Can the gear ratio for the transfer case be changed? The NP205 case gear ratio (i think) is 1.96:1 and the factory gearing (again, I think) was 2.72:1 ratio.

4. Does anyone know what the "Tow/Haul" button does? Does it lock out overdrive? Can it be programmed and pinned out?

Keep in mind, this all for my mall crawling 72 Blazer....

2004 Yukon ECM

[Odin K30]

I would recommend Wayne Hartwig.
My PCM will be on its way out to him shortly.

/forum/motor-tranny-t-case-performance/924402-gm-pcm-tunes-150-life.html

[metal tech]

you can download the EFI Live software and look thru all the tuning areas available for free, it will not program an ecu though. Both HP & EFI have forums to help with tuning, just depends on you, do you want to tune it eventually or leave it to someone else to make any changes? If the tuner doesn't "lock" the tune then anyone can make changes with the right software.

[MCMLXIX]

Originally Posted by metal tech

you can download the EFI Live software and look thru all the tuning areas available for free, it will not program an ecu though. Both HP & EFI have forums to help with tuning, just depends on you, do you want to tune it eventually or leave it to someone else to make any changes? If the tuner doesn't "lock" the tune then anyone can make changes with the right software.

I'm not looking to tune. I was more interested in the specifics of whats involved to get what I want with what I already have. OS change? Segment swap? etc....

I will try and DL one of the tuning programs and look around but I hope one of the tuners on the board can give me a little insight...

[lilcucv]

I have and use Hp tuners,I have to send the file to customer support to have them do the segment swap on the trans. Tow/Hauls just changes the shift points and line pressure. Your tuner should not have any problems.

[MCMLXIX]

I was searchinhing more threads... looks like conflicting info for changing the transfer case 4LO ratio....

Originally Posted by MaxPF

EDIT: Scratch that. I just checked, and there doesn't seem to be a field for TC ratio in the LS PCMs. I was thinking Allison TCM, which does have a t-case ratio field...

Originally Posted by Bo185

To a point. John was just going to segment swap in the 4low tables. Then you might have to fine tune the shift points.

... Both quoted from HERE

It looks like its coming down to what software the tuner is using....

[Bo185]

The PCM you have will ready have the 4low pin ready to go. You won't have a problem that guy had a unique setup in the thread you linked. Yours is pretty common.

One thing to note you will want a 93 octane tune. IF not your holding power back by running 87 with an LQ9.

Just take it the person tuning it. Your paying them to do the work no need to worry about looking like an idiot or downloading anything.

You won't have to worry about tow haul mode not really needed it just changes the shift points basically for the trans. as stated.

[MCMLXIX]

Originally Posted by Odin K30

I would recommend Wayne Hartwig.
My PCM will be on its way out to him shortly.

http://www.pirate4x4.com/forum/showthread.php?t=924402

I PM'd Wayne a while ago when I started looking at motors. He said .... " Also if PCM isn't the same PCM from that motor and doesn't have 4l80e already in it, I will need to have it re-VINned (before I can tune it) at the dealer and they charge me $100."

I thought the 4L60e to 4L80e change was a segment swap, not a dealer only re-vin issue that costs $$$. This adds to my confusion as to what "things" can be changed by what tuning software... vs... something only a dealer can change...

[Bo185]

If I am not mistaken one has to have to have HPtuners themselves do the segment swap .bin and I guess its vin dependent or something. He uses HP tuners BTW. Might be cheaper to just get a LQ4/4l80 PCM to start with.

But there is a way to tune the PCM with out the segment swap using the 4l60 tune. Its posted on LS1 tech.

[MCMLXIX]

Did some research and found a 2005 Chevrolet Silverado K2500 that has the LQ4 Gen III 6.0L gas engine mated to a 4L80e transmission. On the Tune File Depot I found a factory tune that had the same vin (minus the last sequential numbers ) 1GCHK23U35F000000. It has on OS of 12592618 with 12591723 calibration.

I also found a 2005 GMC Yukon with the Gen III 6.0L LQ9 engine (which is the one I have) and it has the same OS of 12592618, but a different calibration. I guess becasue of the LQ4 vs. the LQ9 and other details...


Looks like Pin 16 on Connector 2 is the 4WD LO signal. This can be an extension of the harness into the cab (follow the DATALINK cable) and either make it a manual switch or a contact switch on the TC shifter.

*** Question 1: Can an 2005 OS 12592618 replace the 2004 OS on LS1B PCM with service number 12586242?


*** Question 2: Is there a transfer case gear ratio table (that can be altered) for when the 4WD LO signal is applied? It needs to be 1.96:1 (NP205) issntead of 2.72:1 (NP241)

[Bo185]

Originally Posted by MCMLXIX

Did some research and found a 2005 Chevrolet Silverado K2500 that has the LQ4 Gen III 6.0L gas engine mated to a 4L80e transmission. On the Tune File Depot I found a factory tune that had the same vin (minus the last sequential numbers ) 1GCHK23U35F000000. It has on OS of 12592618 with 12591723 calibration.

I also found a 2005 GMC Yukon with the Gen III 6.0L LQ9 engine (which is the one I have) and it has the same OS of 12592618, but a different calibration. I guess because of the LQ4 vs. the LQ9 and other details...

One its because of the 4l80. The LQ9 only cam with the 4l60e. And the LQ9 had different tune for the higher CR and had a high octane tune basically.

Originally Posted by MCMLXIX

Looks like Pin 16 on Connector 2 is the 4WD LO signal. This can be an extension of the harness into the cab (follow the DATALINK cable) and either make it a manual switch or a contact switch on the TC shifter.

Most times the signal cam from the range selector switch on the dash for the eshift cases. I would just do a switch on the dash if you like to flip buttons or just place one on the linkage. I thought the manual shifts TC had them in the transfer case but I don't remember off the top of my head with out looking it up.

Originally Posted by MCMLXIX

*** Question 1: Can an 2005 OS 12592618 replace the 2004 OS on LS1B PCM with service number 12586242?


*** Question 2: Is there a transfer case gear ratio table (that can be altered) for when the 4WD LO signal is applied? It needs to be 1.96:1 (NP205) issntead of 2.72:1 (NP241)

I am not sure that's far enough off or a ratio to mess it up. The speedo may be off but it should still shift fine.

I am not sure EFIlive or HPtuners support changing the TC ratios. I would like to know this as well as I am looking at getting either one and would buy one over the other if it had that ability and the other didn't.

[MCMLXIX]

The NP205 I have has a switch on the shift rail, but its not for 4LO, so it will probably be a switch on the linkage....

I downoald EFI Live and then the stock tune for the Silverado... nothing about transfere cases at all... I couldn't tell it was a 4wd vs 2wd file... but I only spent about 20 minutes looking...

The local guy thats going to build my harness and do my tune has HP Tuner, EFI Live, Diablo, something else and a GM TIS something.... He can swap operating systems and I hope he can find someway to change the TC ratio...

The local guy is the owner of MoTech.
He does LS swaps intp the JK. He's taking his 6.2L powered JK to Tahoe for an event this weekend. JK HERE