VersaTune User Forum

Hello, I tried to find more info about this option, but I couldn't find anything.
From what I read it is trying to avoid OEM target 14.7 from ecu.
But I have few questions.
1. Should I use it with NA build (cams, headers etc.)?
2. Load from 1-2 is inteded for Turbo application?
3. If I am using it the ECU will try to target the exact values that I have set in OPEN LOOP?
I will be very thankful for any information or advice from you.

1. What do you actually want to override and why? there are AFR targets, you can use those.
2. load above 1 means some form of forced induction. In NA form load of 1 and slightly above (maybe 3% max) are very rare.
3. I honestly can't understand the context of the question. However, since for the NC1 there's better control over the OL AFR targets you can just set the closed to open loop transition thresholds a bit lower. But in all honesty the factory ones are set just fine.

Mituc I was trying to understand why is there Global open loop AFR override. The option that you have added.
So when should I use the Global Open Loop AFR Override and what is meant for?

Right now logs are showing Desired equivalence/air to fuel ratio (λ) = 0.99 on WOT. Will the setting For Global Open LOOP AFR Override change this to use actual values in the new table Open Loop AFR Override?

I have never personally tuned an NC MX5 but this is my understanding of it.

When you enable the AFR Override table, you can then set your AFR targets for when the car is in only in open loop to whatever you want and ignore the factory open loop AFR target tables.

By default, the table is set to 14.7 AFR (1.00 lambda), which is close to your 0.99 lambda that you are seeing, so maybe you haven't adjusted that table to what you want desired AFRs to be?

What are you trying to achieve? If the car is still naturally aspirated, I don't see much point in the table over the factory tables.

If possible, can you send some logs and your current tune so we can look over it.