Autometer Air/Fuel Guage?

[MM2death]

Does anyone know what their "rich" "lean" & "stoich" means in terms of parts air to fuel are. Like would the stoich part be from 12 to 12.5 or what? Or any there any air/fuel guages out there that have numbers on them instead?

Any help appreciated,

Scott.

[rb25]

When its in the middle yellow bit its running at 14.7:1

red is like 16:1 and into the middle of the green (rich) its about 11:1? I think this is right... hope it helps

[YBSLO4]

Put it this way... mine is a waste of money... looks good, but thats about it. It never stands steady to be ready when driving so no point of it. Problem is the ECU continusously readjusts itself all the time and is the reason why the signal is constantly modifed and the lights bounce around so much.

[rb25]

i got mine off a mate so I could fill the hole in my dash - i agree - waste of money and time

[MM2death]

Thanks for the imput. I think you have changed my mind with buying one.

Scott.

[skyr33]

A/F meters are useless when ECU is in closed loop,but the moment you step on it, the meter should give stable reading.Run it on the dyno against a good A/F meter and maybe mark with texta different readings on the gauge itself.Otherwise its too generic with its Lean/stoich/Reach positions.

[YBSLO4]

Then why does mine not give a stable reading at all when i peg it?

Even when cruising its all over the shop like it bounces from side to side...

[one8tsx]

When cruising ( in closed loop mode) it is meant to cycle from rich to lean. That indicates that your oxy sensor is working properly.

When gunning it ( open loop) it should read rich.

The middle of the gauge is stoic (14.7:1). Only thing is, because nearly all factory oxy sensors are only narrow band, they can't tell the difference between a little lean and mega lean. Wheres proper dyno air/fuel gauges are wide band and measure from 10:1 to about 20:1 or so.

[GTS-t VSPEC]

I've seen them and think they are a waste of money, they flit around without providing any useful info. Get a knock sensor gauge if you want to see if it's pinging:D