OS upgrade

[Naf]

Hi,

I am lookin to change my engine from a LS6 to a LS2. Now i found my PCM to be 12592618 and i would like to upgrade the os to 12596660. Is this possible? Or will i be runnin into issues?

[ScarabEpic22]

Swap in an LS2 for an LS6? Need a different ECM entirely, an E40 or E38 (or E67) to run an LS2, the LS1/6 PCM cannot control it. If you just want to upgrade the OS, then you can upgrade to a COS if you want but just upgrading GM OSs (unless theres something changed) wont do anything...

[dfe1]

You can run an LS2 with your existing PCM, but the LS2 has to be equipped with a 24-tooth reluctor and LS1 style knock sensors. LS2 and LS3 swaps are farily common and a number of companies offer the necessary conversion harnesses. The reluctor swap isn't quite as easy-- the crank will have to come out of the block.

[ScarabEpic22]

Hmm, I stand corrected. Make sure you check because some LS2s come with 24x reluctors (06 TB SS, 05-06 SSRs, early Vettes) from GM. But the Vette from 06+ has 58x and the 07-08 TB SSs are 58x too.

[dfe1]

I think in LS2-land 24-tooth reluctors are accompanied by E40 processors and 58-tooth reluctors go along with E38 processors.

[ScarabEpic22]

I think in LS2-land 24-tooth reluctors are accompanied by E40 processors and 58-tooth reluctors go along with E38 processors.

Yep, thats the reference I was using, the 06 TB SS/05-06 SSRs use the E40, 07-08 TB SS uses the E38.

[Naf]

You can run an LS2 with your existing PCM, but the LS2 has to be equipped with a 24-tooth reluctor and LS1 style knock sensors. LS2 and LS3 swaps are farily common and a number of companies offer the necessary conversion harnesses. The reluctor swap isn't quite as easy-- the crank will have to come out of the block.

Took your advice and got my LS2 with the correct reluctor installed, and also got I think all the needed harness adaptors...CAM relocation and knock relocation...

Will talk with a friend from lingenfelter and see what else would be needed...

Thank you again...