Swapping ECU while keeping VE and ignition tables

For a couple of years I've been wanting to swap my current ECU (ME221 Gen1) for a more modern one (Thinking about a Haltech Nexus S2 at the moment), but since I don't personally have access to a dyno and the car is already dyno tuned with the current ECU, I would like to reuse the VE and ignition tables and do some road tuning to dial everything in.

Because volumetric efficiency says something about how well an engine can move air, I would think this would stay the same as long as the engine itself is unchanged. I would also use the same base timing to make sure the ignition table would remain the same aswell.

Would I be correct in thinking this would indeed work, or are there more differences between ECUs that would not make it possible to retain these tables?

You can usually copy over a VE / Fuel Table, and only need to scale it for a different ECU as a starting point.

For example, after you get the new ECU running, and find the fuel mixture is 10% lean at idle & cruise, you just multiply the entire table by 1.10 to fix it.

You should be able to use the Ignition table unchanged, just verify with a timing light (with both the old and new ECUs) that the commanded timing is what is actually happening.

I would still take it to a dyno as the fastest way to restore what you had for the fuel tuning.

Hi David, Thanks for the quick response! This was exactly the information I was looking for.

Seems like I can continue with this plan.

Thanks again!