Global Open Loop AFR Override info

Tuning discussion specific to 2006-2008 NC1 Miata MX-5 vehicles
Post Reply
reibes
Posts: 8
Joined: April 13th, 2025, 4:44 am

Global Open Loop AFR Override info

Post by reibes »

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.
mituc
VersaTuner guru
Posts: 1538
Joined: December 17th, 2011, 2:47 pm
Location: Iasi/Romania

Re: Global Open Loop AFR Override info

Post by mituc »

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.
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~550BHP @35PSI
2008 Icy Blue Mazda CX7
Built engine and stock exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 360-ish BHP
Post Reply