AEM Electronics - Ignition, Fuel and Methanol Systems

"SEnS" means the gauge detects a sensor error. First check the sensor connector and the harness. If the connections are good, the O2 sensor has failed and must be replaced. A replacement Bosch LSU 4.9-based sensor can be used on AEM X-Series wideband gauges that are set up for the LSU 4.9.

Wideband sensors are racing parts and in most cases a broken sensor is not replaced for free, because the failure is usually caused by the installation position in the exhaust (condensation, too close to the exhaust port, pointing downward, etc.). Send us a photo of the sensor installed in the exhaust so we can evaluate the case. Watch our video on how to choose the correct installation position: https://www.youtube.com/watch?v=WY8AsnIex8A

For the fuel pump we recommend the AEM 50-1000 high flow in-tank pump. For the blow-off valve there are two excellent brands: GReddy (FV type and Type FV/BFV kits made for the Evo 7/8/9) and Turbosmart (Kompact Plumb Back 34 mm, which recirculates the air quietly, or Kompact Dual Port 34 mm, which gives part of the characteristic vent sound). All are original, reliable products; the choice is mainly about sound.

Both kits are plug and play and both are designed to upgrade the RX-8 ignition. The MSD kit gives a slightly stronger spark, which helps more on a turbocharged or heavily modified (e.g. bridgeport) engine. A mounting kit is available for both.

For an engine with a stock ECU and bolt-ons (e.g. decat, exhaust manifold) the best value-for-money kit is AEM ignition coils with MSD spark plug wires. Anything stronger is unnecessary for that setup. For turbo or heavily ported engines we recommend the MSD Smart Coil kit.

Usually not. Stock-type wires (including many aftermarket wires built to the stock coil terminals) have coil-side terminals for the factory coils and do not fit the AEM 30-2853. You can either order a new MSD wire set built for the AEM coils, or buy the correct boots and terminals and re-terminate your wires. The second option needs a special crimping tool and is more error-prone.

A common cause is an incorrectly installed coil connector. Before plugging in, look closely at the connector pins: they should all look identical, straight and in good shape, and be fully seated. A loose or damaged pin causes a bad connection that can make the coil overheat and fail.

We cover the coils for 2 years as long as the coil has not changed shape. The most common problem on the RX-8 is coils that swell/overheat because a workshop left them connected while cranking the engine for a compression test (without spark plugs the energy has nowhere to go). Always disconnect the coils before a compression test. Installation requires basic technical skills.

Yes. The AEM X-Series Inline Wideband UEGO AFR Controller 30-0310 offers the same functionality as the Innovate LC-2 (3877): a wideband controller without a display that outputs AFR to your ECU, logger or dash.

Double-check the power and ground wires; a bad ground is the most common cause. If the wiring is fine and the sensor was new and stopped working immediately, the sensor is replaced.

The gauge itself has a 2-year warranty. The O2 sensor is a racing part and, like all wideband sensors, it is not covered by warranty because its life depends on fuel, installation position and use. However, if the sensor does not work out of the box (it has never been installed in an exhaust), we will replace it.

Yes, all products are new and original, not B-stock or returns. The 30-0300 kit includes the new AEM FAE wideband sensor (not a Bosch LSU 4.9). The gauge has a 2-year warranty.

The 30-2001 is the old Bosch LSU 4.2 sensor used on AEM wideband gauges about 10 years ago. Current AEM X-Series AFR gauges use the AEM-FAE sensor. To be 100% sure which sensor your gauge needs, send us a photo of the sensor connector on your harness.

Yes. The 30-0312 is designed to display values that are available on the AEMnet CAN bus, usually from AEM ECUs such as the Infinity. The 30-0310 broadcasts its data on AEMnet, so the 30-0312 will show its values.

AEM moved to its own AEM FAE (private-label) wideband O2 sensor. AEM says the new sensor is more durable, faster and more accurate, and our own testing agrees.

Not necessarily. The standard controller's internal MAP sensor is rated to 35 psi, but that doesn't limit the boost you can run; the settings only define when the pump starts and when it reaches 100% output. Example with a 1000 cc nozzle: Start = 5 psi, Full = 10 psi, then the pump starts at 5 psi, delivers ~500 cc at 7.5 psi and full flow from 10 psi up to 50 psi or more. The "Full" setting doesn't need to match your maximum boost. The HD controller (40 psi MAP) is only needed if you want injection to start and progress at higher pressures, e.g. on small engines running 2–2.5 bar where you want...

Mount the pump with its hydraulic (pump) section at the bottom and the motor on top. That way, if a leak ever occurs, fluid will not run into the electric motor.

Yes. The first thing we need to know is the boost pressure the engine works at, to choose between the standard controller (30-3304, up to 35 psi) and the HD controller (30-3306, up to 40 psi).

Yes. AEM replacement V3 water/methanol injectors are sold separately (30-3313, pack of 2).

AEM controllers differ by the MAP sensor range. The standard controller with internal MAP (30-3304) is rated to 35 psi boost, the HD controller (30-3306) to 40 psi. Choose the one that covers your maximum boost with the best resolution; for lower boost the 35 psi version gives finer control.