The AEM X-Series Wideband Air/Fuel Ratio Gauge sets the benchmark for speed and accuracy. Built on AEM’s patented X-Digital Technology (Patent 9,575,030), it’s been independently proven to be the fastest-responding wideband AFR controller available, giving tuners the real-time precision needed for safer and more effective tuning.
AEM co-developed its next-generation wideband sensor with FAE, a leading global automotive supplier. The result is a more durable, faster-responding sensor that excels in high-performance environments and works across a wide range of fuels — including gasoline (leaded or unleaded), ethanol, methanol, diesel, propane, and CNG.
The X-Series Gauge features a compact 52mm diameter with an ultra-slim 0.825" depth, allowing easy installation in tight spaces. Its center display is 87% larger than AEM’s previous model (30-4110), delivering a modern, easy-to-read interface with user-configurable options for AFR, Lambda, or O₂% display modes.
Features
- Fastest responding wideband AFR controller
- Patented X-Digital Technology for unmatched accuracy and signal fidelity
- Works with AEM FAE or Bosch LSU 4.9 sensors (auto-detects type)
- Factory-calibrated resistor (no free-air calibration required)
- Compatible with EFI or carbureted setups and a wide range of fuels
- Outputs: 0–5V analog, RS-232 serial, and AEMnet (CANbus) for data logging or daisy-chaining up to 16 controllers
- Auto-dimming feature adjusts brightness for day or night driving
- User-configurable display: choose AFR, Lambda, or O₂%, and 3- or 4-digit format
- Includes: black bezel and dual-sided black faceplate
- Gauge size: 52mm (2-1/16")
- Depth: 0.825" (gauge cup depth only 0.200")
Why Response Time Matters
A faster wideband means more accurate feedback control and a safer tune. AEM’s X-Digital Technology minimizes deadtime — the delay between exhaust composition change and sensor output — ensuring your data matches real engine behavior. The result: cleaner, more consistent tuning and reduced risk under high load or boost conditions.
