Zeirtronix Zt-4 Dual Wideband Controller and Datalogging System

Code: ZT4


1 in stock (can be backordered)

1 in stock (can be backordered)


Zeitronix Zt-4 Dual Wideband Air/Fuel ratio meter is a simple to use high quality, stand-alone system for  carbureted and electronic fuel injection engines.

The new Zt-4 has the same high quality, high precision air fuel ratio readings as our signature Zt-2 wideband. The Zt-4 supports wideband air fuel ratio and lambda readings, adjustable simulated narrowband outputs and configurable linear wideband outputs for ease of use with engine management systems and 3rd party gauges.

The new Zt-4’s dimensions are only 3.3 by 2 by 1 inches.

Includes the Zt-4 Wideband Air/Fuel Ratio Meter
10 ft high temperature, high quality, O2 Sensor Harness (2)
4.9 O2 Sensor (2)
Signal Harness
Data logging software available for download.
Made in the USA.

PC cable for logging and outputs setup is an option available for purchase.

Installation instructions
Zeitronix Data Logger Software

Zt-3 Wideband


Optional Dual AFR ZR-4 Gauge

Plugs and powers up directly from Zt-4 Gauge / Data port
For best accuracy the ZR-4 Gauge reads digital data from the Zt-4.
Base diameter     2″ 1/16 (52mm)
Bezel diameter    2″ 1/2   (62mm)
Thickness           0.75″      (19mm)
Digit height         0.2″       (5mm)



Configurable Switching Point of
Simulated Narrowband Output

Replace the signal from your stock narrowband oxygen sensor for increased fuel savings or smoothed idle RPM. 

Adjustable Narrowband Output

Configurable Wideband Output

Match the Zt-4 Wideband output to your engine management system, data logger or a 3rd party gauge. 

Volts  AFR
AFR vs Voltage Table

Zt-4, a simple dual wideband AFR
No matter if you have a stand alone engine management system, a piggy back fuel control or a carbureted engine. The Zt-4 Wideband Air Fuel Ratio Meter is a must for serious tuners!  Finally you can tune for more power, closer to the edge, precisely monitoring both banks of V engine Air/Fuel ratio. Optional datalogging up to 9 hours of data with a blazing rate of 65 samples per second per graph. The Zeitronix Data Logger Software can be utilized as a real time display when using a standard Zt-4 kit with or without the ZR-4 or DashDAQ displays.


Very simple installation – connect two wires to +12V and ground and place two O2 sensors in the exhaust stream and you are ready to read AFR!  A simple LED indicator displays off, warm-up and running modes.

Additional information is available for setting up the configurable linear wideband output with your particular engine management system.

Zt-4 Specs

  • 0.1 AFR accuracy
  • Operating voltage 10V to 18V
  • Switching power supply for oxygen sensor heaters
  • Precise sensor temperature control
  • Reverse polarity protection
  • Integrated self resettable fuse
  • Positive lock connectors
  • Protected inputs and outputs
  • Flexible Plug and Play Sensor Harness with a small, easy to route through the fire wall, connector
  • Optional logging serial cable available
  • Easy to install plug and play kit
  • Two Adjustable Narrowband Switching Point
  • Two configurable Wideband Analog Outputs


  • 2  Bosch Wideband O2 sensor Inputs
  • Simulated and adjustable switching point Narrowband Outputs to feed a stock ECU
  • Linear Wideband Outputs (configurable with a default setup of AFR = Volts * 2 + 9.6
  • Serial data output to the Zeitronix ZR-4 AFR or DashDAQ displays
  • Serial data output for real time datalogging (PC laptop and optional logging cable required)
Input / Output Range
Lambda 1.43 to 0.64 Wideband
AFR 21.0 to 9.6 Wideband
Analog Wideband Outputs 0 – 5V (configurable) see 0 – 1V
Narrowband Outputs 0 – 1V (configurable rich/lean switching point)

Zeitronix Datalogging Software
The Zt-4 communicates with the PC Laptop via the serial port using optional serial cable. The 
Zeitronix Data Logger (ZDL) software records up to 9 hours of data per single file. Many different screen display options are available including plots, text and dashboard views and uses a black plot background for easy night tuning. Logging start, stop and pause are accessible from keyboard shortcuts. The ZDL software supports excel CSV and text data export.

Win98/NT/2000/ME/XP/Vista/Windows 7/8/10 compatible.
You do not need P4, P3 or even P2 laptop. We understand that you want to leave your new laptop at home and dedicate the old one to car tuning. We give you well optimized software. If your laptop is capable of running Win95 and up it is good enough for the Zeitronix logging software.

The digital gauge screen option could be used when purchasing the Zt-4 without a display.

Zeitronix Data Logging Software Download.

Optional Displays:
  • ZR-4 Dual AFR Gauge
  • DashDAQ Touch Screen Display
  • nGauge

Additional information

Weight 1.5 lbs
Dimensions 8 × 5 × 4 in


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

You may also like…