How do you read a wideband AFR gauge?

How do you read a wideband AFR gauge?

The way you read an air-fuel ratio (AFR) gauge is by looking at the ratio and then looking at the lambda value, which is your air fuel ratio divided by the stoich. If your AFR is higher than the stoich, your fuel mixture is lean. But if the AFR is lower than the stoich, that means that your fuel mixture is rich.

What should my air fuel ratio gauge read?

-At idle or a steady cruise, it is normal for your gauge to display an AFR value of 14.0:1-15.5:1 or 0.95-1.05 in lambda. -A naturally aspirated motor under high load will target an AFR value of 12.5:1-13.3:1 or 0.85-0.91 in lambda.

What AFR is too rich?

Most stock to slightly modified engines will run just fine at an AFR of 15 and yield better MPG. If you prefer better PERFORMANCE then we suggest to run an AFR of 14 or even richer to around 13.

What is a good AFR at idle?

The 14.7:1 ratio is perfect for idling and light throttle cruising conditions as it’s the most efficient mixture possible, meaning the best fuel economy and lowest emissions.

How do wideband O2 sensors work?

The wideband air/fuel ratio sensor combines an oxygen-sensing “Nernst” cell from the narrow band sensor with an “oxygen pump” to create a device that gives a wide range response to various air/fuel ratios. The Nernst cell senses exhaust gas oxygen in the same as a conventional narrow band O2 sensor.

Is a wideband gauge necessary?

You need it if you don’t wanna blow the motor due to running lean. Every other gauge is optional. A Wideband gauge is a must and install it right in front of your face so you always know what’s going on with the A/F ratio when the car is on boost.

Is 17 AFR too lean?

But that’s in an ideal world, one where every molecule of fuel and oxygen is completely consumed during every single combustion event. In a real engine, a 14.7:1 air-fuel ratio is a little too lean. If you lean out past 14.7:1, all the way to something like 17:1, your engine will run cooler again.