2014 5.3 LMG to 2008 6.0 LY6 - Will the LMG tune be able to start the LY6?

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Charlie207

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Or, will I need to swap the LMG injectors into the LY6 intake manifold/fuel rail?

Can the ECU correct for the displacement difference?
 

Marky Dissod

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Might start it? Even if it does, it'll likely have enough trouble idling, that I'd advise against shifting it into 'D'.
It's not as simple as a displacement difference, or displacement and injectors.
 

tooleyondeck

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You will need the ECU tuned if you're keeping the LMG one. If at all possible, try to acquire the LY6 ECU with the engine and it should be a direct swap and fire right up. You can then have the VIN changed on the LY6 ECU.

I'm assuming you just have a long block if you are asking about swapping the intake manifold? I believe the gen 4 truck intakes are all the same but I am not 100% certain. Hopefully someone who knows will chime in.
 
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Charlie207

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You will need the ECU tuned if you're keeping the LMG one. If at all possible, try to acquire the LY6 ECU with the engine and it should be a direct swap and fire right up. You can then have the VIN changed on the LY6 ECU.

I'm assuming you just have a long block if you are asking about swapping the intake manifold? I believe the gen 4 truck intakes are all the same but I am not 100% certain. Hopefully someone who knows will chime in.
The engine came with no loom or ECU.
 
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Charlie207

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You will need the ECU tuned if you're keeping the LMG one. If at all possible, try to acquire the LY6 ECU with the engine and it should be a direct swap and fire right up. You can then have the VIN changed on the LY6 ECU.

I'm assuming you just have a long block if you are asking about swapping the intake manifold? I believe the gen 4 truck intakes are all the same but I am not 100% certain. Hopefully someone who knows will chime in.
I have the complete engine, but it had no loom or ECU.
 
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Charlie207

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In that case, your current harness and ECU should work. You will just need it retuned to 6.0 parameters. I see you have a Blackbear tune currently, they should be able to help you out reflashing it.
From what I had read, the 2008 engine is plug'n'play with the existing 2014 loom, so I'm assuming I can load a canned 6.0 tube to get up and running, and then do some data-logging with my AutoCalV3.

One of the differences I see is the difference between 6.0 and 5.3 fuel injectors (flow rate). The 5.3 looks to have larger?
 

tooleyondeck

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Looks like there are 2 different injectors that came on the LY6: 12580681 is 30lb/hr and 12587269 is 40lb/hr

LMG uses 12613411 36lb/hr

All are 58psi and EV6 style. Both engines are 9.6:1 CR

LMG has a smaller combustion chamber (799/243 heads: 65cc) vs the LY6 (5364/823 heads: 70cc).
 
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Charlie207

Charlie207

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Looks like there are 2 different injectors that came on the LY6: 12580681 is 30lb/hr and 12587269 is 40lb/hr

LMG uses 12613411 36lb/hr

All are 58psi and EV6 style. Both engines are 9.6:1 CR

LMG has a smaller combustion chamber (799/243 heads: 65cc) vs the LY6 (5364/823 heads: 70cc).
Good info, thanks.
 
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