Clarify this for me.
You see the VK45de, you admire the VK
- I got that part
You have a G37 6 speed manual and believe that physically it will bolt right onto the VK.
- I think I got that too
You are curious to know if the VK can be made to run with a pre-2003 Nissan harness & ECU
- OK, what Nissan harness and ECU are you referencing exactly?
- I believe it has to be a V8 at least so that the ECU even knows to look for 2 other cylinders (Not much experience personally)
- Also, I have seen info that suggests for a fact the 06+ ECMs are tunable using UpRev. The pre 06+ ones were considered unlockable, but UpRev has been used on the FX45 older style ECUs. No positive info on the 03/04 M45 or the Q45s.
- The VK45de was first used in the States for the 2002 Q45, and for the M45 it started in 2003. The plugs themselves on the engine are directly swappable all the way from a 2002 Q45 to a 2010 M45; the difference is at the ECU and transmission, and the hydraulic fan solenoid.
This might not answer your question directly, but it might offer some info on the USDM VK45DEs:
v8-engine-replacement-options-do-the-03 ... 19905.html