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V · 12-02-2021, 06:48 PM

Basic question... Can an LS3 ecm (2010/2011) run an ls1/6 engine?
I know the reluctor wheel on the crank would need to be swapped out for a 58x instead of the stock 24x, but other than that, would it work? Obviously the wiring harness would be custom.

The reason I ask, is I'm thinking of doing a LS swap into a 2010 vehicle and to be "legal" it has to be an engine of the same or newer year. I have an LS1 /T56 from my GTO I could use and figured if I could run a 2010 ecm with the applicable emissions equipment from a 2010 ls3, I might make it all work. If its just not possible/feasible, id look into selling the ls1 and buying a newer LT1 and making that work somehow(or buy a different donor car maybe).

Edit: The more I think about it, it may not even matter. If nj dmv asks for evidence that its a 2010 engine, it'd still be an 04 paperwork wise. Im not sure if just a '10 ecm running the corresponding emissions equipment would suffice.

I'm almost wondering if Just using the stock 04 pcm, and having the vin re-flashed to match the car would pass inspection

12-02-2021, 06:48 PM	#1
V Stalker Join Date: Aug 2004 Posts: 12,077 iTrader: (12)	ls3 ecm running an ls1/6? Basic question... Can an LS3 ecm (2010/2011) run an ls1/6 engine? I know the reluctor wheel on the crank would need to be swapped out for a 58x instead of the stock 24x, but other than that, would it work? Obviously the wiring harness would be custom. The reason I ask, is I'm thinking of doing a LS swap into a 2010 vehicle and to be "legal" it has to be an engine of the same or newer year. I have an LS1 /T56 from my GTO I could use and figured if I could run a 2010 ecm with the applicable emissions equipment from a 2010 ls3, I might make it all work. If its just not possible/feasible, id look into selling the ls1 and buying a newer LT1 and making that work somehow(or buy a different donor car maybe). Edit: The more I think about it, it may not even matter. If nj dmv asks for evidence that its a 2010 engine, it'd still be an 04 paperwork wise. Im not sure if just a '10 ecm running the corresponding emissions equipment would suffice. I'm almost wondering if Just using the stock 04 pcm, and having the vin re-flashed to match the car would pass inspection Last edited by V; 12-02-2021 at 07:08 PM.