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Early
Warning
System
(EWS)
Air/Fuel Ratio Meter
Purpose:
To allow for the safe increase of boost on your turbo/supercharged
vehicle, you should monitor the air/fuel mixture. This meter
allows you to read relative changes in your mixture and warns of
lean conditions that can damage your engine.
Our meters are preferred by
serious racers due to their accuracy and intense display, which is
easily read in bright sunlight.
Applications: The "E-W-S" is tuned to work well in all forced
induction applications. Be it a supercharged, factory turbo, or
custom built system, our meter will help to protect against lean
mixture damage. Approximate size for all units is 2.5" by
1.5"(display face) by .5". All you need is a narrow-band O2
sensor, like the one that came standard on 96% of the fuel
injected vehicles in the world.
What makes
the E-W-S superior to other Air/Fuel Meters?: Our meter is
color graduated around a generally recognized as safe .90 volt O2
sensor reading.
The lights are
color-coded to warn of excessively lean or rich conditions.
This allows the meter to be
read at a glance, by color. Each meter is individually tuned using
internal potentiometers and a calibrated DVM (compared to the mass
produced gauges which use resistors--and are not individually
calibrated) to give the most accurate results available from a
narrow-band O2 sensor. Also, we use a different style of case,
which allows the monitor to be surface mounted anywhere you wish.
In other words, you don't need to cut holes or buy a gauge pod.
Additionally, it may be pointed at the windshield for a "heads up
display" that allows the readout to be read as a reflection in the
windshield. Our meters are the brightest on the market and use
color coded indicators that remain clear when inactive. This
allows for easy reading in full sunlight, while preventing false
readings.
Price:
$70 And you won't need to buy a gauge
pod (or cut holes) for mounting . Complete online instructions are
provided.
F.A.Q.
Why
do I need the E-W-S?: To monitor your Air/Fuel mixture under
boosted (i.e. Turbocharged, or Supercharged) conditions. If you
plan to raise the boost (and even if you run stock boost), you
need to know if your engine has enough fuel. If you don't, you run
the risk of serious engine damage from detonation.
I've heard
that you need a wide-band sensor to tune your A/F mixture. How do
you do it with a narrow-band sensor?: Although an expensive
wide-band sensor is needed to make precise changes in mixture
(such as those made when programming an ECU fuel map), narrow-band
sensors can provide enough information to warn of excessively
lean conditions under boosted applications. Racers have been
successfully using the voltage output of narrow band sensors for
over 20 years, to prevent costly engine damage. Our unique
display provides an Early Warning System that is not even provided
on many wide-band units. For this reason it makes an excellent
supplemental system for a wide-band meter, as well as a great
stand-alone system.
My late
model vehicle uses a wide-band sensor. How can I use the E-W-S on my vehicle?: If you have a 91- present Honda, a new
Subaru WRX, or other vehicle using a wide-band sensor, don't
worry. You can still get the benefits of our DEW System, by
fitting an auxiliary sensor. We sell a heated (4 wire) sensor
below for $50. Any exhaust repair shop can fit a bung (threaded
fitting) to your exhaust system for about $20. The same procedure
is needed for the fitment of an aftermarket wide-band A/F meter,
or for the use of other narrow-band meters (such as the Autometer
unit).
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 and distracting you, 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. For these reasons, 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 divided into .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
Why
doesn't the E-W-S 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 a quicker car. 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, which
is worse than having no A/F meter at all!
Remote E-W-S
We
also offer our E-W-S meter with remote indicators, which allow you
to create a custom display. The remote unit includes all the
features of our standard E-W-S with 12" of cable for the display.
All bezels and complete on-line instructions are included.
Here is a sample of an excellent installation by Rick Love, in his
H2
And two shots of another H2 installation by
"Harold"
Before installation:
Use the order buttons to the
right to get the Standard or Remote E-W-S
Just
$6 for
US Shipping
$10 Anywhere else, regardless of order size!
Or, Email us your questions at
ThreeBarRacing@yahoo.com
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E-W-S A/F Meter
