Are A/F ratio gauges junk.

[bigwrxguy]

I was going to get one but had to people tell me they are very reliable.

[rpfride]

Reread youre thread. Youre question doesnt make sense.
But ,most, a/f gauges for the wrx do not work well/unreliable/inaccurate (ig,autometer) b/c you need a wide band O2 sensorfor the rex.
They are not "junk" and infact are one of the more important gauges one should have. You just have to spend alittle $ to get a good one.

[bigwrxguy]

I was going to get a A/F gauge but had two people tell me they are not very reliable.

I must have been on crack when I wrote the first post.

[Quack]

I was going to get a A/F gauge but had two people tell me they are not very reliable.

I must have been on crack when I wrote the first post.

if you are to get a A/F guage, get a wideband.

[cail]

If you want it to be reliable, you need to get a wideband A/F meter like Quack said (to plug it on the front oxygen sensor).

If you get a narrow band A/F meter, you will need to plug it on the rear oxygen sensor and the reading won't be as good as it would be with the front sensor.

Or you can do like me and build your own meter...taking the signal from the front oxygen sensor....total build cost...less than 20$

[Quack]

Or you can do like me and build your own meter...taking the signal from the front oxygen sensor....total build cost...less than 20$

details...

[cail]

The signal coming out of a narrow band oxygen sensor is 0-1V
The signal coming out of a wideband oxygen sensor is 0-5V
This is the reason why you can't use the wideband sensor with a normal A/F meter.

The signal from the wideband oxygen sensor goes into the ECU on the connector B137 on pin 19 (the wire is white and the B137 connector is the bigger)

So, knowing where the signal is, it was easy to read it.
I took a LM3914, which is a DOT / Bar display driver. (

http://cache.national.com/ds/LM/LM3914.pdf

)
I did some modifications to the circuit on the page 2.
It's working fine. I wait for a fiberglass plate to insert it under my radio

http://public.fotki.com/cail/divers/dvc00525.html

This is only the circuit. I'll post pic of the final product as soon as i get my plate

[cail]

here is the final product

A/F meter

[Racenut]

Nice job

Looks like a fun project.

So you just tapped into the factory O2 sensor right?

[cail]

Nice job

Looks like a fun project.

So you just tapped into the factory O2 sensor right?

Right...even if some people say it is not accurate

[Racenut]

Well, an LED indicator isn't exactly accurate, but I'm not going to use it for tuning, just would like to have some way of knowing if things get a little stupid

[boosted scoob]

The signal from the wideband oxygen sensor goes into the ECU on the connector B137 on pin 19 (the wire is white and the B137 connector is the bigger)

Do you know the signal wire for the narrow band o2 sensor (rear one)? Will a regualr 0-1V o2 sensor work exactly with the rear o2 sensor?

[bjbrad85]

Just wondering if you heard that A/F gauges (like the ones in boostedscoob's avatar) were unreliable or, all A/F gauges in general, including needle style ones. Im considering a defi d-series A/F gauge (needle style) in my GVR4 so like you, Id rather not spend the $$$ on something thats going to turn out being cosmetic. Sorry, dont mean to hijack

[WRXcelration]

any gauge is better than no gauge