Aem air fuel ratio gauge wiring 4100-78437
If you run too lean or too rich, the ground output will trigger whatever you set it up to trigger. Easy huh? The results of the Failsafe are the same whether in boost or vacuum. You would grab the upper red line and move it to 12.5, and grab the lower blue/green line and move it to 10.8 air/fuel. Those of you still reading this should say to yourself, “no problem I can do this.” You would move the X axis to where you get to 1-2 pounds of boost and from that point, moving over to the right, you will set your upper and lower parameter lines. To be safe, you want your car to have between a 10.8-12.5 A/F ratio when under positive intake manifold pressures (boost). Take a look back at the graph where you’ll see a programmable pressure side on the X-axis. Some of you may be asking, ”Who cares about when the car is in vacuum? What about when I am boosting my car since that is where I need protection?” OK. If you wired that blue ground wire to the hazard light button on your dash, your caution lights would begin flashing letting you know that something is wrong. Because of that, the gauge reacts by grounding an output wire that will stay grounded until we get back between our upper and lower safety lines. An air/fuel ratio of 16.5 is out of your upper data point marked with the RED line. Here is the beauty of the AEM Failsafe Gauge. The motor is still running somewhat fine, so you don’t notice it. The loss of fuel pressure causes the car to lean out to 16.5 A/F. This time around though, you end up scraping a bit more than usual and you end up with a small hole in the fuel line. Say you go over a high point on the ground and you drive a lowered car that tends to scrape over small pebbles. Now we see how this gauge can come in handy. It means that all of the data points we are collecting are within reason. This is a good thing, since those lines are how you set your air/fuel warnings for too rich and too lean. Notice that this number is between the red line on top and our blue/green line on bottom. If your car is tuned well (of course with an AEM EMS) then your AEM gauge should be collecting data and seeing it right around 14.0-15.0 air/fuel on the gauge, which you can see on the X-axis of the graph. Since you are taking it easy and just cruising around you will be staying in vacuum and not making any boost.
You’ve got your trusty AEM Failsafe gauge reading the air/fuel ratio. The light green/blue line and the red line indicate what we have programmed into the gauge as outliers that should cause us to be alarmed.ĮXAMPLE: Let’s say you are in an Evo IX and you’re at low RPM, out of the boost. The yellow dots on the graph are our plotted data points that the gauge is recording. On the Y-axis is the air/fuel ratio, and on the X-axis is the manifold pressure. In the photo above you have a basic graph, like something from a High School Science class. While these features all add to this gauge’s value, it’s really worth WAY more with its unique failsafe feature.
Aem air fuel ratio gauge wiring 4100 78437 software#
AEM’s Failsafe Gauge also comes with data logging with up to 3 hours of recording time (the data analysis software is a free download from the company’s site). Now, instead of buying a boost gauge and an A/F gauge, you only have to buy one, freeing up some of that dashboard and gauge pod space. As a bonus, it can display the boost and air/fuel ratio at the same time on one gauge. The engineers at AEM have been so kind as to add a function that allows the user to set high and low air/fuel ratio parameters that the gauge can react to. The AEM Wideband Failsafe Gauge is really AEM’s proven Wideband O2 sensor and gauge-type controller upgraded to be programmable, and more importantly include logic. That would be a huge mistake! Give us 2 minutes of your time to take a closer look at what this new gauge is all about and what it can do for enthusiasts like us. At first glance, most of us might write it off as “just another wideband gauge on the market”. A closer look to find out if this is just another boost and A/F gauge or do we really have something special here?ĪEM just released a revolutionary new gauge called the Wideband Failsafe Gauge.