rogergm92

iTrader: (2)

Hi Gurus, I've just banshifted and sent into space a piston and now I'm going 4L80e

The question, what computer and harness would you use, the 99 computer and somehow control the 4l80e. Or put the 2002 LQ4 computer and somehow make the BCM/dash work. And based on your decision, what would it take?

BTW Using HPTuners

The car

• Camaro z28 1999 3bar SD T56 manual
• OS 9373372 converted to 1263008 P01
• working dash, speedo, fuel level

Now I got a donor

• Silverado 2001-02 LQ4 DBC
• complete harness with PCM (last digits stamped 0411), I guess the hardware is a P01
• 4l80e

Help me deciding what to do and if what I'm planning makes sense

Option 1:

1. keep my 99 pcm and 99 harness
2. write complete a 2002 camaro 4l60e (extra credits?)
3. segment swap a 4L80e from truck
4. just pin the extra transmission cable and vss
5. cross fingers

Option 2 (I think sometimes some pins change like o2 or BCM, maybe I'm wrong):

1. keep my 99 pcm and 99 harness
2. write complete a truck 6.0 stock file (extra credits?)
3. just pin the extra transmission cable and vss
4. cross fingers (do I have to re pin something else?)

Option 3:

1. put the harness of the 01-02 silverado and PCM into my camaro
2. how to connect that into my dash,bcm, etc... ?

Option 4:

1. put the PCM of the 01-02 silverado directy on my 99 camaro harness
   1. add extra transmission connector and vss into the 99 harness
2. Do I have to repin something else???

Option 5: You tell me

Thanks!

BoredTruckOwner

Hey there,
I'm still slowly getting into OEM tuning so you might want to take what I say with a grain of salt.

Firstly, since both PCMS are P01s it's a bit simpler, the biggest variances from what I've gathered is how the O2s are pinned. I personally think that using 01-02 PCM would be the easiest option, the BCM and PCM communicate using the serial protocol and the only signal that the PCM sends to the dash is the tachometer and the rest are from the senders(grain of salt here). I think that as long as you change the VIN on the new PCM to match the VIN on the BCM its plug and play. I could be completely wrong but that's what I've gathered over the last couple of months.

rogergm92

iTrader: (2)

Thanks man, that piece is enlightening

rogergm92

iTrader: (2)

any other thoughts?

I might just go 4L60e trim from 99 and do the RELAY mod so I dont waste more credits?

Any old school LT1 guys with 4L80e can tell me if the relay mod is reliable?

minytrker

iTrader: (13)

I always do option 1 and it works fine.

rogergm92

iTrader: (2)

Just confirming, you are saying a write complete of a 2002 Camaro SO and later a segment swap of a 4L80 from a truck with the same os#, right?

Does that change your VIN? Would I have to license again with hpt? What about the BCM, any problems?

nocooler

iTrader: (5)

Use your pcm and segment swap the trans to an 80e. Plenty of segment swap info around. Make sure to do a write entire after the segment swap. You’ll need to either buy a harness for the trans or make one, its only a handful of wires. https://www.speartech.com/product_p/4l80eaddon.htm

rogergm92

iTrader: (2)

Somehow found in here a 99 4l80e truck with that specific OS https://forum.hptuners.com/showthrea...80-O-S-9373372 , did just the segment swap with my original 1st read . Did a write entire and then bricked like at 80% write (with a trusted bench harness).

Now here is the question:
- are those 99 4l80e stock files trusted?
- if going with my spare pcm (the same 99 OS 9373372 converted to 1263008) from 99 to 2002 SO, segment swapping 4L80e and then doing a 3 bar custom OS, shall I write entire for each step? or shall I use the new segment swap file, apply 3 bar to the segment swap file and with the newly saved file shall I just perform 1 write entire?

Thanks

nocooler

iTrader: (5)

Honestly - I've never bricked a pcm with HPTuners. It might be time to contact support and see if they can help before you spend any more credits.

rogergm92

iTrader: (2)

Ok here are the results, it might help someone

Fried 1 pcm, I don't know why, that was before the post.

Now the successful steps, using a fully charged battery (no more ac adaptors) and bench harness and laptop just on battery:
- write entire original read (from 3 bar to stock)
- with that original read entire, applied a 99 4L80e segment
- saved the new file
- write entire the new file
- cycled 2 times the pcm
- with the segment swap file, I applied 3 bar OS, putten the correct 4.8 engine size, other ton of stuff and then saved it in another file
- write entire the new file
- cycled 2 times the pcm
- made changes to flattened tables, put in my injector data and other ton of stuff
- saved it as a new file
- write calibration

I haven't tried the pcm, but at least I know it is responding and definitely it will start the car. No bricked PCM

And for what I see, the 99 file of the this post named 1999 sierra is working for segment swaps https://forum.hptuners.com/showthrea...80-O-S-9373372 with a 9373372 OS. I remember when all over the interenet there were no 9373372 4L80e files.