Best OS for application
Thread Starter
Joined: Oct 2011
Posts: 175
Likes: 21
From: Eastern PA --> Southwest VA
Best OS for application I am currently using, in my 02' camaro, a pcm out of a 99' camaro with a 9373372 OS that has been segment swapped for a 4l80e. I tune using Hptuners and I'm running VCM editor 4.6.3. Right now I am finishing up an engine/trans refresh and want to also start a tune from scratch, as it has been modified through a number of engine combos by different tuners and myself.
Is there any advantage of moving to an 02' 12212156 OS from an 02 camaro/firebird? Better resolution or additional tables that would be helpful?
If so, is it more wise to segment swap an 02' OS OR to use a factory 02 truck OS with the 80e segment already?
This will be going into an 02' camaro with a gen3 LS, DBC, 4L80e, and will be using a speed density tune (likely an enhanced 1bar mod from Hptuners)
Is there any advantage of moving to an 02' 12212156 OS from an 02 camaro/firebird? Better resolution or additional tables that would be helpful?
If so, is it more wise to segment swap an 02' OS OR to use a factory 02 truck OS with the 80e segment already?
This will be going into an 02' camaro with a gen3 LS, DBC, 4L80e, and will be using a speed density tune (likely an enhanced 1bar mod from Hptuners)
Any time the correct year and model OS is an option, use that to avoid any future issues with gauges, bcm, etc. There is a ton of swap info available, but why even take the chance on an issue if it is not necessary?
Thread Starter
Joined: Oct 2011
Posts: 175
Likes: 21
From: Eastern PA --> Southwest VA
The car currently has the 99 PCM and OS in a gutted 02' body and harness. BUILD THREAD I'm really asking if there is any distinguishable/favorable difference between my current 9373372OS and the later released 12212156 OS. Everything I am seeing online is showing that the 12212156 is more desirable, but no real reason why.
ALSO, will I be able to update the VIN number in my 99' pcm to match the 02' body it is currently in without updating the OS?
ALSO, will I be able to update the VIN number in my 99' pcm to match the 02' body it is currently in without updating the OS?
Last edited by GtoProject; Jul 31, 2025 at 05:23 PM.
The car currently has the 99 PCM and OS in a gutted 02' body and harness. BUILD THREAD I'm really asking if there is any distinguishable/favorable difference between my current 9373372OS and the later released 12212156 OS. Everything I am seeing online is showing that the 12212156 is more desirable, but no real reason why.
ALSO, will I be able to update the VIN number in my 99' pcm to match the 02' body it is currently in without updating the OS?
ALSO, will I be able to update the VIN number in my 99' pcm to match the 02' body it is currently in without updating the OS?
The car currently has the 99 PCM and OS in a gutted 02' body and harness. BUILD THREAD I'm really asking if there is any distinguishable/favorable difference between my current 9373372OS and the later released 12212156 OS. Everything I am seeing online is showing that the 12212156 is more desirable, but no real reason why.
ALSO, will I be able to update the VIN number in my 99' pcm to match the 02' body it is currently in without updating the OS?
ALSO, will I be able to update the VIN number in my 99' pcm to match the 02' body it is currently in without updating the OS?
I used to tune everything with efi live (10+ years ago) and it doesnt care about the vin/os mismatch so I used to flash every 99-01 f-body over the the 02 12212156 OS for years just to have the better tables.
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Thread Starter
Joined: Oct 2011
Posts: 175
Likes: 21
From: Eastern PA --> Southwest VA
Yes the newer OS has a better charge temp model, one main VE table, and a host of other small things. The fact that you have an 02 body/VIN is another reason to use the newer 02 OS, so it matches. I see no reason to use a 99 OS as the PCMs are basically the same and you can just put the 02 OS with the 02 VIN in it.
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On The Tree
Joined: May 2023
Posts: 116
Likes: 4
The car currently has the 99 PCM and OS in a gutted 02' body and harness. BUILD THREAD I'm really asking if there is any distinguishable/favorable difference between my current 9373372OS and the later released 12212156 OS. Everything I am seeing online is showing that the 12212156 is more desirable, but no real reason why.
ALSO, will I be able to update the VIN number in my 99' pcm to match the 02' body it is currently in without updating the OS?
ALSO, will I be able to update the VIN number in my 99' pcm to match the 02' body it is currently in without updating the OS?
ve very cautious about swapping OS. Ifyou have the original PCM stick with it and stick with the OS in my oppinion. I took some advice and swapped OS for one with some more paramiters that I probably didnt need and now I got a brick that wont even ground pin reset. Been pulling out my hair and cursing this thing for a week got help from some of the top guys on here and still dead in the water. So I would say to you be very cery cautious about making a change and do your homework and then do some more. Make sure it is really worth it to change but my gieas is your juat fine with what you have. Leave well enough alone and sleeping dogs lay....
ve very cautious about swapping OS. Ifyou have the original PCM stick with it and stick with the OS in my oppinion. I took some advice and swapped OS for one with some more paramiters that I probably didnt need and now I got a brick that wont even ground pin reset. Been pulling out my hair and cursing this thing for a week got help from some of the top guys on here and still dead in the water. So I would say to you be very cery cautious about making a change and do your homework and then do some more. Make sure it is really worth it to change but my gieas is your juat fine with what you have. Leave well enough alone and sleeping dogs lay....