Quick Details

  • Type: Oxygen Sensor
  • Brand Name: Magnum tuning
  • Delivery: Worldwide
  • Retail Price: $ 74.99 w/ shipping
  • Place of Origin: Hungary
  • Model Number: RTC-456T
  • Additional Service: Wholesale distributors welcome
  • Warranty period: 10 Years

Packaging & Delivery

Packaging Details in bubble wrapped envelope, shipped as a gift
Port xsb


Magnum Electronic Fuel Injection Enhancer has been developed to engines installed with popular water4gas generators. Save 40% !

Magnum Electronic Fuel Injection Enhancer has been developed to engines installed with popular water4gas generators. It modifies the Oxygen Sensor signal in fuel injected vehicles controlled by Electronic Control Unit. When installing an H2O electrolyzer more should be processed to achieve extreme MPG increases. After we inject HHO gas into the engine the oxygen sensor reports a change in the exhaust gas consistence to the Electronic Control Unit accordingly ECU will fix the perceived problem by enriching the mixture. This situation will indicate usually an error code turning on the check engine light and put the ECU in open loop status with medium level performance. Safe mode can dramatically decrease MPG benefits resulted by H2O generator. EFIE is not intended to be a fuel saver by itself but can warrant 30-50% improvement of MPG if you use HHO electrolyzer.



  • Improves economy by up to 50% (average 40 %) if water4gas installed
  • Does not affect acceleration
  • Does not reduce HP and torque
  • 10 year defections warranty
  • Easy universal installation
  • Waterproof workmanship
  •  Further Modification not required
  •  Output
  •  pulsed signal
  •  Facture chromium body with melted epoxy
  •  Mixture leaning range 0 ... 50 %
  •  Wiring inline with the signal wire of O2 sensor
  • +/- 12 V

Odds and Ends


MAGNUM EFIE adjuster supplied pulsed signal will be accepted by the ECU.

The unit is heat and waterproof.

Wires can be extended.

EFIE Adjuster works exactly as described and fulfills claims in regarding to the economy improvement. .

Device can be working properly if the stock oxygen sensor is not worn and delivers perfect signals to the ECU.

O2 sensors should be replaced after each 50,000 mile or 80,000 km.

This is not a performance chip it will not allow to enrich the mixture.

Ideal for all types and brands of HHO generators.

Contact can be created by supplied terminals or soldered in place. Hydrochloric acid recommended by soldering.

Magnum Tuning has been dealing with manufacture of ECU upgrades and performance parts since 1994. Our experience warrants 100% efficiency, reliability & perfect style.


An automotive oxygen sensor, also known as an O2 sensor, lambda probe, lambda sensor, or EGO (exhaust gas oxygen) sensor, is a small sensor inserted into the exhaust system of a petrol engine to measure the concentration of oxygen remaining in the exhaust gas to allow an electronic control unit (ECU) to control the efficiency of the combustion process in the engine. In most modern automobiles, these sensors are attached to the engine's exhaust manifold to determine whether the mixture of air and gasoline going into the engine is rich (too much fuel) or lean (too little fuel).

This information is sent to the engine management ECU computer, which adjusts the mixture to give the engine the best possible fuel economy and lowest possible exhaust emissions.

Since the air/fuel ratio in injected up-to-date vehicles is regulated by the Electronic Control Unit (ECU) and most factory ECUs are set to maintain a 14.7:1 air/fuel ratio; this is known as a stoichiometric fuel mix, user is unable to trim manually or mechanically this ratio as by early models. If too much oxygen is detected, the ECU thinks the mixture is too lean, and delivers more gas, if less oxygen is sensed, the ECU thinks the mixture is too rich and injects less gas to the engine.

If you install a hydrogen generator the oxygen content in the exhaust will rise. The more powerful HHO system you apply the more oxygen will be in the exhaust gas and this will result a fuel lean status accordingly ECU will send more fuel thus actually you will not save fuel despite this was the main reason you installed the H2O system for.

We need to trick the ECU into thinking that the engine is still burning is inefficient within the combustion chamber, by fooling the computer to sense there is less oxygen in the exhaust than there actually is. The amount of modification to the voltage signal is simply adjustable thru the enhancer unit to accommodate different amounts of hydrogen being injected.

MAGNUM Electronic Fuel Injection Enhancer will modify the O2 sensor signal in a 0 ... 50 % range indicating a regular pulsed fuel rich signal to the ECU. This way ECU will reduce the amounts of injected fuel and you can improve the MPG by up to 50 %.

EFIE Adjuster is actually maximizing the Air Fuel Ratio (AFR) indicating fuel rich status. While you are injecting HHO gas into the engine you need to lean the air/fuel (gas) mixture if you really want to save gas. if you do not act so engine will work with a mixture with full of gas and HHO, reducing the power and failing MPG enhancement. When you are driving in HHO mode you have to strive to feed the engine by few gas.

In order to adjust this voltage the EFIE adds an adjustable value to that delivered by the oxygen sensor.

This extra voltage compensates for the variation caused by HHO. Adjustments to the trim screw can change the EFIE's voltage correction by 1millivolt. This fine tuning will allow you to reach peak MPG and result incredible economy.

Tests on fuel economy have given an increase of 8-16 MPG but may differ depending on engine, terrains, tire size etc.


Magnum Tuning has been applied the latest test-proven techniques and innovative designs since 1994 to improve upon fuel efficiency.

Magnum fuel savers are specifically designed to take full advantage of today's vehicle technology.


MAGNUM Electronic Fuel Injection Enhancer adjuster wires inline between the oxygen sensor and ECU. You need to cut only the prior (before the catalytic converter) O2 sensor's signal wire and add +/- 12V to the adjuster. This device does not require a higher degree of skill it has a basic installation can be performed in 20 minutes without any special expertise. If car has one prior and one post oxygen sensor, you have to wire up a Magnum EFIE adjuster to the prior sensor only. Two EFIE units will be required for each prior oxygen sensor if dual exhaust installed with two upstream sensors before the cat.

Installation is VERY EASY and universal for each model. Please read the following steps before bidding or purchase.

1. Find the signal wire of (prior - upstream) oxygen sensor according to the chart below.

2. Splice the signal wire and contact the orange cable to the o2 sensor side, the yellow cable to the other end.

3. Contact the red wire to the ignition +12V and the black to the ground, chassis or battery negative.


Full left position means factory signal the more you turn the potentiometer clockwise the leaner the mixture will be. Full right position means 50% leaning.

Optimal point should be around 30-35% reported by our technicians after several thousand installation.


EFIE Adjuster is compatible with all HHO generators


USD 74.99 $ with worldwide shipping

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