If you’re a car enthusiast or a professional mechanic, then you must have heard about the Air Fuel Ratio gauge. It’s an essential tool that helps you monitor the air-fuel ratio in your engine. In this article, we’ll be discussing the AEM Air Fuel Ratio gauge, its wiring diagram, and how to install it in your car.
What is an Air Fuel Ratio Gauge?
An Air Fuel Ratio (AFR) gauge is an instrument that measures the air-fuel mixture in your engine. This gauge helps you monitor the fuel mixture and make necessary adjustments to maintain an ideal air-fuel ratio. The ideal AFR for petrol engines is between 14.7:1 to 12.5:1, while for diesel engines, it’s between 18:1 to 21:1.
The Air Fuel Ratio gauge comes in different types, but the most common ones are the narrowband and the wideband gauges.
Narrowband Gauge
The Narrowband gauge is the most basic type of AFR gauge. It measures the air-fuel ratio between 14.1:1 to 15.5:1, which is the range that the engine’s oxygen sensor operates. The narrowband gauge is affordable and easy to install, but it doesn’t provide accurate readings.
Wideband Gauge
The Wideband gauge is the most advanced type of AFR gauge. It measures the air-fuel ratio within a wide range between 8:1 to 20:1. The wideband gauge is more accurate and provides more precise readings than the narrowband gauge. However, it’s more expensive and requires professional installation.
What is AEM Air Fuel Ratio Gauge?
The AEM Air Fuel Ratio gauge is a popular wideband gauge that’s used by car enthusiasts and professional mechanics. It’s known for its accuracy and reliability, and it comes with many advanced features that make it stand out from other wideband gauges in the market.
AEM Air Fuel Ratio Gauge Features
| Features | Description |
|---|---|
| Wideband | Measures air-fuel ratio between 8:1 to 20:1 |
| Fast Response | Provides accurate readings in real-time |
| Multiple Sensors | Allows you to monitor multiple exhausts |
| Data Logging | Stores information for future analysis |
| Easy Installation | Comes with all necessary hardware and instructions |
AEM Air Fuel Ratio Gauge Wiring Diagram
The AEM Air Fuel Ratio gauge wiring diagram may look complicated, but it’s relatively easy to install. Here’s a step-by-step guide on how to wire the AEM Air Fuel Ratio gauge:
Step 1: Mount the Gauge
The first step is to mount the gauge on your dashboard or any other location that’s easily visible. Make sure that the gauge is securely mounted and won’t vibrate or move around while driving. Align the gauge properly and use screws to secure it in place.
Step 2: Connect the Power Source
Connect the red wire from the AEM gauge to a switched power source. You can connect it to the ignition switch or any other source that’s turned on only when the car is running. The black wire should be connected to the car’s ground.
Step 3: Connect the Sensor
The AEM Air Fuel Ratio gauge comes with a Bosch LSU 4.9 sensor. You need to install the sensor in the exhaust system, preferably before the catalytic converter. Connect the sensor’s white wire to the gauge’s white wire, and connect the black wire to the car’s ground. The red wire should be connected to a switched 12V power source.
Step 4: Connect the Gauge to the Sensor
Connect the gauge’s green wire to the sensor’s green wire, and connect the gauge’s blue wire to the sensor’s blue wire. Make sure that all connections are tight and secure.
Step 5: Test the Gauge
Once you’ve connected all the wires, turn on the car and start testing the gauge. The AEM Air Fuel Ratio gauge should light up and show the air-fuel ratio readings. If the gauge isn’t working correctly, check your wiring connections and make necessary adjustments.
AEM Air Fuel Ratio Gauge FAQ
Q: Can I install the AEM Air Fuel Ratio gauge myself?
A: Yes, you can install the gauge yourself if you have basic knowledge of car wiring. However, we recommend that you seek professional help if you’re unsure about your wiring skills.
Q: Is the AEM Air Fuel Ratio gauge compatible with all types of vehicles?
A: The AEM Air Fuel Ratio gauge is compatible with most petrol and diesel engines. However, you need to check the gauge’s specifications before purchasing to ensure compatibility.
Q: Can I use the AEM Air Fuel Ratio gauge for tuning my engine?
A: Yes, you can use the AEM Air Fuel Ratio gauge to tune your engine for optimal performance.
Q: Can the AEM Air Fuel Ratio gauge be used as a standalone device?
A: No, the AEM Air Fuel Ratio gauge needs to be connected to a Bosch LSU 4.9 sensor to function correctly. The sensor is included in the package when you purchase the gauge.
Q: Is the AEM Air Fuel Ratio gauge waterproof?
A: No, the AEM Air Fuel Ratio gauge isn’t waterproof. You need to protect it from water and other liquids to ensure its longevity.
