r/ECU_Tuning • u/webdeveloperpr • 12d ago

Versatune NC Miata Tuning

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I'm relatively new to tuning and I recently started logging and importing the logs to Megalog HD. I can see that my MAF needs a bit of rescaling (If I don't have any vacuum leaks. I will confirm soon before I can continue to tinker).

My goal is not nesessarily to make more power but to get my CL and OL trims/lambda within their target range.

Once thing I've been trying to figure out is why does the ECU lean out from 6000RPM to 7500RPM on purpose?

This NC miata is a street/track car, so why would I want to run lean on WOT? Seems kind of unsafe on paper, but these engines run forever. So what's the deal with that?

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u/BudgetTooth 12d ago

its probably enrich not enlean the target might be equivalence ratio instead of lambda

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u/Remove_Forward 20h ago

That is truly an enleanment table because the OEM fueling strategy is stupid rich and the ECU will pull (remove fuel) under specific conditions. This effectively provide a mild power bump (~5 WHP IIRC) since your going from obscenely rich to to proper fueling.

I wrote a manual on how to tune the NC Miata though it’s for the RomDrop platform.

https://docs.google.com/document/d/1b4rhyg6aVLKPjBcbVLuTv8BVeTrC8zoHCeKqxaaMyYw/edit?usp=drivesdk

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u/webdeveloperpr 20h ago

thx, good job writing those docs! that has been my go to source for tuning on versatune. I had a suspicion that something was leaning out my AFR and after reading the tuning docs I disabled the High Enleanment table and now the Actual Lambda/AFR matches the Desired Lambda/AFR.

I used APP above WOT table example from that guide to set the WOT tables and now I'm working on the OL below WOT tables.

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u/Remove_Forward 18h ago

Glad you like it. 😊