PPEI – Installing the Dynojet AT-300 Dual Wideband / Autotune

Installing the Dynojet AT-300 Dual Wideband / Autotune

The AT-300 dual-channel wideband / autotune kit provides vehicle-specific AFR data needed for custom tunes on a Honda Talon with Power Vision 3.

Step 1What You Need:

Dynojet AT-300 Dual Autotune / Dual Channel Wideband kit.
Power Vision 3 (PV3).
Two wideband O2 sensors and bung locations in the exhaust.
Keep the factory O2 sensor installed.

Step 2Connect the Dual Wideband Module:

The dual wideband module plugs into the 4-pin flat connector that pigtails off the main PV3 harness near the diagnostic port connector.
The module will also need to be connected to a switched power and ground.

Step 3Install Exhaust Bungs and Sensors:

For turbo applications install the O2 sensors in the head pipes before the turbo.
One bung per cylinder.

Step 4Map the Sensors (Important):

Sensor 1 = front cylinder.
Sensor 2 = rear cylinder.
On the back of the wideband module there is a 1 and a 2. Trace each harness to the matching bung.

Step 5Set Up the PV3 and Log Data:

Add gauges for Air Fuel Ratio 1 and Air Fuel Ratio 2 (AFR1 / AFR2).
The module needs to be connected for datalogging. You do not have to leave it plugged in all the time.
To start and stop a log, press the circle button on the PV3.
To verify on the PV3: display AFR1 and AFR2, then unplug the sensor in the front cylinder. AFR1 should stop reading. If AFR2 drops instead, the sensors are reversed. Swap them so Sensor 1 is front and Sensor 2 is rear. That makes log analysis much cleaner on our end.
Expected readings:
- Sensors may sit around 10 for a few minutes while they warm up.
- After warmup, idle is usually around 14.
- On decel you may see around 30 because the injectors shut off.
- At higher loads we typically like to see AFR between 11.5-12.5 (may vary depending on setup).
- If AFR gauges do not show up after install:
  - Confirm the module is plugged into that 4-pin flat PV3 pigtail.
  - Check the wiring at the wideband module. Sometimes the wires come loose at the module.

Step 6After Install — What to Send PPEI:

Confirm Sensor 1 is front and Sensor 2 is rear.
Flash the tune file we provide (when applicable).
Send a datalog that includes idle and light part throttle driving.
Do not go over half throttle until PPEI reviews initial datalog.
If something looks off, reply on your ticket or email with a photo of the module wiring and which cylinder each sensor is in.

Sensor Mapping Check

Sensor 1 = Front cylinder

Sensor 2 = Rear cylinder

Display AFR1 and AFR2 on the PV3, then unplug the front-cylinder sensor. AFR1 should stop reading. If AFR2 drops instead, the sensors are reversed — swap them before you send a log.