an inexpensive A/F meter for WOT only?
+ Reply to Thread
Results 1 to 2 of 2

This is a discussion on an inexpensive A/F meter for WOT only? within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; This requires splicing into the OE oxygen sensor. FAQ from the indash one. What are the differences between ...

  1. #1
    tan is offline
    Thinking Man's Engine tan's Avatar
    Join Date
    Dec 2001
    Wharton, NJ

    an inexpensive A/F meter for WOT only?

    This requires splicing into the OE oxygen sensor.

    FAQ from the indash one.
    What are the differences between this and your standard meters?:
    Nothing! Except the new display! Each indicator is mounted in its own bezel on the end of an 18" lead. This allows you to put the indicators almost wherever you want. Only a .25" hole is required to mount each indicator light. The bezels "pop" into the holes for a neat and clean installation.

    What does this meter do?: This meter is designed to measure the voltage output of the oxygen sensor. The lights are color coded to values that are generally recognized as safe, where the air/fuel ratio is concerned.

    Why don't you use a bargraph like everyone else?: If you don't find it difficult to count segments on a bargraph at wide open throttle, then you need to run more boost. Seriously, when I first installed a competitor's model, I found it a pretty hard to read without taking my eyes off the road. The bars were dim, small, and there was not enough color distinction between the yellow and green indicators. I wanted something easy to read, that I could mount directly in front of me, or read by color out of the corner of my eye. Plus, 70% of the bargraph is supplying useless information. It just distracts you from the important info.

    I noticed that your meter only has four lights, but others have 10. Why is that?: Most ten segment air/fuel meters read from 0-1 volts, in approximately .1 volt increments. Since the gauge is only read at wide open throttle, we are primarily concerned with the last 3 segments of the 10 segment display. The other segments are just flashing annoyingly when you are not using them. If you are using the first seven segments during WOT, you're too lean, and in immediate danger of toasting the engine. Our gage shows everything below .90 volts as too lean, by illuminating a red light. So, at a glance, you know "red is bad, lift throttle". From .90 to .94v, a yellow light is illuminated, indicating that you are "in the zone". You will want to think twice about increasing boost without adding fuel. From .94 to .98v, the green light is illuminated, indicating that you are getting enough fuel and are a little on the rich side. Some people prefer to stay there and enjoy an extra margin of safety, but if you want to start increasing boost, the fuel is there. From .98 volts up, the blue light illuminates, indicating that you are very rich, and may want to consider lowering fuel delivery or raising boost for more power. So you see, the resolution is actually improved over the range where you need it most (.04 volts per light vs .1volts per light), while eliminating the distracting flashing lights that you don't use.

    The indicators on our meter are calibrated to .04 v increments as shown below:

    First light: Red= .78 to .90v

    Second light: Yellow= .90 to .94v

    Third light: Green= .94 to .98v

    Fourth light: Blue= .98v and up

  2. Remove Advertisements

  3. #2
    Registered User Rich10's Avatar
    Join Date
    Oct 2002
    Long Island
    The problem is that the stock sensor is a narrowband sensor and is worthless for tuning.
    2002 WRX WRB

+ Reply to Thread

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself. We strongly suggest that you stay away from using aol, yahoo, msn, and hotmail accounts. Sometimes the mail server blocks the emails from our server. As a result you will not receive any notifications including the confirmation email.

Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts