NEW! The Latest Breakthrough in EFIE Technology!

The Quad Digital EFIE Basic is the next new member of our family of digital EFIEs. Digital EFIEs allow much leaner settings on vehicles than other types of EFIE. We recommend Digital EFIEs for all narrow band oxygen sensors that are upstream of the catalytic converter. Note, that the Quad EFIE uses a pair of analog EFIEs for the downstream sensors (see the article in the link above to see why the downstream EFIEs need to be analog type). Digital EFIEs have the following benefits:

1. Can make the air/fuel mix much leaner than earlier designs. With this device you can lug down your engine, and often kill it if you set it too lean.
2. Absolutely rock steady adjustment no matter what temperature the environment. Will vary less than 1/2 of 1% over it's rated temperature range of -40 to 125 Centigrade.
3. Will work with older, "tired" oxygen sensors that should have been replaced. Other EFIE styles may require these to be replaced. Mind you, if they are old, they should still be replaced. But if they are working prior to your EFIE install, they will still work with this EFIE.
4. One adjustment pot modifies both upstream (Digital) EFIEs equally, and similarly, one pot adjusts both downstream (Analog) EFIEs. This makes these devices easier to set.

NEW! The Latest Breakthrough in EFIE Technology!

The Digital Dual EFIE Deluxe is the first of a new family of products that we have developed. These will allow much leaner settings on vehicles than other types of EFIE. They should now be used for all narrow band oxygen sensors that are upstream of the catalytic converter. It has a number of important new features:

1. Can make the air/fuel mix much leaner than earlier designs. With this device you can lug down your engine, and often kill it if you set it too lean.
2. Absolutely rock steady adjustment no matter what temperature the environment. Will vary less than 1/2 of 1% over it's rated temperature range of -40 to 125 Centigrade.
3. Will work with older, "tired" oxygen sensors that should have been replaced. Other EFIE styles may require these to be replaced. Mind you, if they are old, they should still be replaced. But if they are working prior to your EFIE install, they will still work with this EFIE.
4. One adjustment knob modifies both sensors equally. These devices are much easier to set.

Note: If you need to treat sensors that are downstream from a catalytic converter, we do not recommend this device. Use our legacy style EFIE for these sensors instead. These are intended for upstream sensors only. We now offer a Quad EFIE with 2 Digital upstream EFIEs and 2 EFIEs designed to handle downstream sensors for complete oxygen sensor control.

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We have produced the world's first EFIE that is designed specifically for use with wide band oxygen sensors. It will work with all types of wide band and AFR (Air/Fuel Ratio) sensors. To be clear, it is the EFIE of choice for both 4-wire and 5-wire oxygen sensors. Also note there is a variation of the 5-wire sensor that uses 6 wires. This device will work with these too. Please note, it will NOT work with narrow band sensors. For these, you must use any of our other EFIE product lines, such as the Dual EFIE Deluxe.

Note that this product is only available in a dual configuration at this time. This means that this device will control 2 wide band oxygen sensors. For vehicles with single wide band oxygen sensors, just don't hook up the other circuit.

This model comes in a mountable box, and encased in protective plastic. The wiring is 18 gauge, with quick disconnects that can unplug from the device for easy installation. It has one potentiometer that controls the air fuel ratio adjustment for both sensors. An LED shows when the unit is powered up. By using the included rubber cap to cover the potentiometer, the unit becomes waterproof.

These units have a start up delay of about 45 seconds. After approximately 25 seconds the unit will start ramping up. At 45 secs it will reach it's full adjustment to the sensor's signal. This delay is by design so that the fuel mix will be richer during engine start up.

This unit is highly precise. It's signal drift is less than 1% across it's entire operating temperature range, which is -40C to 125C (-40F to 257F). Note that the electronics can get that hot, but the casing will start getting soft at 90C (194F). "C" = degrees Celsius and "F" = degrees Fahrenheit.

An Electronic Fuel Injection Enhancer is used to adjust the signal from the oxygen sensor(s) before they get to the engine's computer to compensate for an increase in fuel efficiency brought about by another fuel efficiency device. The single version handles one oxygen sensor, and the dual version handles two.

The Dual EFIE Basic is a rubber dipped circuit board that has 5" hookup wires for connection to: a) Power, b) Ground, c) Oxygen Sensor, and d) Computer. The dual model has 2 sets of sensor and computer wires. It has two on-board potentiometer to set the amount that the EFIE will alter each sensor's signal. When power is removed from the EFIE circuit board, it's relays will switch the EFIE out of circuit, and re-connect the oxygen sensor signal wires to the vehicle's computer (the same as before the EFIE was installed).