I need help, has any one installed an afr gauge on a 91 ef si
?? It lights up but only read rich. i tapped the white and red wire on the ecu.
can anyone help????

 

get rid of the gauge, they are useless unless its a wideband or titania sensor.

 

i istalled one on mine butt i didnt tap to the ecu what i did is the gauge comes with three wires green red and black the black one is a ground the red one i tap in my fuse box numer 15 fuse and the green one i tap in to the o2 sensor under the hood i taped in the harnnes not the wire that come with the o2 sensor and it seems to work hope this helps

 

how well does it work? can a narrow band gauge help at all, or is it just a total waste.

 

IMO it is a total waste, you cannot do any accurate tuning with it so what is it good for, besides flashing a bunch of annoying LEDs?

Read some more about them and you will see almost 100% will agree with me.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ham &raquo;</TD></TR><TR><TD CLASS="quote">Read some more about them and you will see absolutely 100% will agree with me.</TD></TR></TABLE>

 

I disagree with ham. They are useless to tuning but so are coolant, oil pressure, and other gauges which we can all agree are quite useful. The purpose of a narrowband AFR gauge is to warn you to let off the throttle if you are running lean under heavy throttle or at high RPMs. Think of it as a smarter-idiot light or a check engine light that warns you BEFORE the engine blows up. They also help diagnose your O2 sensor when it goes bad or gets lazy.

Tuning is done ONLY on a dyno. Those "wideband" O2 sensor/gauge combos are okay for tuning driveability, but they're still not as accurate as a true wideband O2 sensor.

 

afr gauges are said to be inaccurate because an o2 sensor will generate a millivolt output. All the other sensors have a reference voltage and a voltage drop relative to that to give a reading. The wideband o2 sensor works like the other sensors, giving it the accuracy and reliability. The titania sensor works in a simliar way.

You do have a point as for having it as an idiot light, but then it might as well just be hooked up to a warning light.

 

can you hook the autometer AFR gauge into a wideband o2 sensor and have it read more accurate?......also on his install mine always read full rich on my crx si until it got warmed up.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gnar kill &raquo;</TD></TR><TR><TD CLASS="quote">can you hook the autometer AFR gauge into a wideband o2 sensor and have it read more accurate?......also on his install mine always read full rich on my crx si until it got warmed up. </TD></TR></TABLE>

No you cannot, the autometer AFR gauge is a narrowband and only reads small millivolt readings. Wideband o2 signal conditioners read higher voltage readings.

1 wire o2 sensors do not work until they are completely warmed up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ham &raquo;</TD></TR><TR><TD CLASS="quote">

No you cannot, the autometer AFR gauge is a narrowband and only reads small millivolt readings. Wideband o2 signal conditioners read higher voltage readings.

1 wire o2 sensors do not work until they are completely warmed up </TD></TR></TABLE>

wrong.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by http://store.yahoo.com/machv/plxmwio2seki.html &raquo;</TD></TR><TR><TD CLASS="quote">
Narrowband to Wideband Gauge ConverterThis device allows the wideband output signal from the above wideband kit to feed a narrowband o2 sensor like the offerings from Autometer. You could simply use the narrowband output from the wideband kit but it simulates what the stock ECU wants to see and the o2 gauge will continue to be very erratic. With this device it drops the 0-5v output to a linear 0-1v output and thus your blinky light o2 gauge will suddenly be.... accurate!

NOTE: This is not a stand alone unit. It must be used with the above wideband kit.


02473$44.00</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by njn63 &raquo;</TD></TR><TR><TD CLASS="quote">

wrong.
</TD></TR></TABLE>

i wasnt wrong necessarily, but I guess there is a converter that costs as much as the gauge.

So it turns a wideband into an accurate narrowband? still seems useless to me.

 

ok, guys at SPARKS racing in NJ told me that it gets you in the ball park. is this true??

 

narrowband has 2 volt readings on it, rich or lean, theres no in between so you can read when your really rich or you can read when your really lean. its not linear like a wideband where you can see inbetween rich and lean

 

Even with a heated O2 sensor, you will run rich while warming up. The ECU intentionally runs your rich to warm you up faster.

I bought a wideband sensor right before the price spiked up to $200+ (now prices have levelled off again). It came from a non CA Civic VX, and I had to have the EMS hooked up to a laptop to get the AFR reading. I used it to automap for driveability after I had the high RPM WOT tuned on a dyno. It was pretty amazing for tuning, but sadly, that car is RIP. Now I'm looking into getting the AEM gauge and have the narrowband output drive the ECU. You gain a small amount of power and mileage from that. From there I planned to save up for another EMS but the money doesn't flow in my direction like it used to.