Best way to find out A/F ratio?

[crazyfast]

What's the best way to find out A/F ratio??I was reading on the net, and most of good A/F meters they cost around $400~900... @@ and stock red top 02 sensor won't read A/F??

I see lot of people put on AutoMeter A/F ratio monitor... is it good?and what 02 sensor should I get to work with A/F gauge?And some people said SR20DET red top no need 02 sensor??? @_@

[Blown240sx]

A/F can be gotten off the ECU by finding the wire from the O2 sensors. It will be the most accurate readin that the ECU gets.

[crazyfast]

hummm... I just thought that Apexi turbo timer has A/F ratio and O2 volt. right? if I install a wideband O2 sensor work with Apexi turbo timer... will the A/F reading be better??

[virus77]

your cars o2 sensor is only used for measuring a 14.7:1 mixture for fuel economy and emmissions so its pretty useless for you to view it because it cant read anything rich or lean from that point. What you need is a wideband o2 sensor/unit which run anywhere from $300-$500, this tells you an exact a/f ratio. Im not to familiar with the apexi turbo timer but maybe you can display a/f on it, but if its not a wideband outputting the numbers its useless.

[crazyfast]

Cuz I read on Apexi turbo timer, I think it says the A/F meter only reads with wideband O2 sensor.... so... with a wideband O2 + A/F meter + O2 sensor volt..?? maybe I can get good reading?? Anyone agree? correct me if I'm wrong ^^

[virus77]

when you purchase a wideband it somes with a sensor, display, cables, etc... Everything you need is in the package to properly monitor a/f ratio. It has a screen and its displays a/f ratio just like a boost gauge would display boost. most units have a output signal that you can feed to another device for viewing, thats where you hook it up to you turbo timer and you can probably view it there too.

[crazyfast]

okok, maybe I'll buy one of those kit...Thanx guys!!

[SmithSR]

For us newbs can we have models and links please!

[crazyfast]

I heard that for red top SR.. don't really need O2 sensor? is it true?

[virus77]

You need an o2 sensor. You dont NEED a wideband o2, but its nice to have one.

[Silvia007]

This may be a long shot but anyone found a wideband O2 sensor that lasts more then a few months?

[virus77]

I ran mine for 12k miles and it worked perfect till the day my motor seized.

[crazyfast]

Virus77- what wideband O2 you using? brand and part #??for SR20DET red top or for KA?

[virus77]

Im using a zeitronix wideband. I used it on my KA-T and Now its going on my SR. Search the KA-t Forum for wideband there has been a million discussions.

[Turbogixxer]

This may be a long shot but anyone found a wideband O2 sensor that lasts more then a few months?

unless you are running leaded race gas, your wideband should last about 20k-40k miles.

[cheez80]

another alternative to "find[ing] your a/f ratio" is a trip to the dyno

[xero1]

i have found out that the apexi turbo timer is not accurate when it comes to o2 volts or a/r ratio. before i hooked up apexi turbo timer i use my mutimeter to sample the o2 volt at the ecu; the apexi turbo time was reading around 200mv less than my multimeter(uei multimeter), but the apexi turbo time only cost 100 and my mutimeter was 240. so get a cheep mutimeter from autozone($20) and hook it up to you o2 wire and it will tell your o2 volt.

[777aaron]

http://www.diy-wb.com/

http://www.jegs.com/cgi-bin/nc...r=361

http://www.jegs.com/cgi-bin/nc...r=361

http://www.jegs.com/cgi-bin/nc...r=361