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Racepak Air Fuel - Wide Band O2

Racepak has an excellent selection of A/F controllers and sensors created specifically for tuning race engines. Each of these 2 and 4 channel controllers are designed to be connected to the V-Net cable of Racepak V-series recorders. All sensors have a 13” pigtail cable, and the controller has a 37” cable for attachment to the sensor. These lengths cannot be altered. Controllers are ordered by cylinder bank layout.

Racepak A/F sensors are compatible with either gasoline or methanol fueled engines. Gasoline application will display A/F ratios between 9.55:1 and 20:1, while methanol is shown from 4.22:1 to 8.7:1. Please specify the type of fuel you will be using when ordering. Each sensor includes one weldment and plug.

Rcaepak O2 sensor kits can be used with all Vnet products and can run on 12-18 volt battery systems.

Additional weld bungs & plugs as well as stainless bungs are available in single packs or any quantities.

Bung Installation


AF-1 single channel air/fuel sensor   with sensor This is the same unit for any fuel. Its simply a software setup option to specify methanol etc.

The AF2 has been discontinued effective 1/1/12 220-VM-AF2

4 Channel Controller, Cylinders 1, 3, 5, 7
(For use on 2, 4, 6, 8 cylinder bank of V8, i.e. GM & Mopar)
   No sensors ($80 each)

Cable lengths: controller to sensor plug 36", sensor 14", V-net pigtail 16", power 60"

4 Channel Controller, Cylinders 2,4,6,8
(For use on 1, 3, 5, 7 cylinder bank of V8, i.e. GM & Mopar)
   No sensors ($80 each)


4 Channel Controller, Cylinders 1, 2, 3, 4
(For use on 1, 2, 3, 4 cylinder bank of V8, i.e. Ford)
    No sensors ($80 each)



4 Channel Controller, Cylinders 5, 6, 7, 8
(For use on 5, 6, 7, 8 cylinder bank of V8, i.e. Ford)
    No sensors ($80 each)


Air/Fuel Sensor Only (new style, for 220-VM-AF-series) 810-SN-AFAMP


AF Sensor Only (old style, for 220-VM-LS series) Note the round plug


Air/Fuel Weldment & Plug
(Weldments are included with purchase of controller)


Single Channel VNet A/F Module
(For use with 890-KT-AFX or user-supplied 0-5v sensor)


Harness End repair kit


  click here for 4 and 8 and 25 weld-in O2 bungs - SS too



MSI O2 bungs
8 mild steel bungs

WEB Price

   Weight 2

Mild steel 18mm thread - works with any oxygen sensor

8 SS bungs

WEB Price

   Weight 2

Stainless steel bung  



O2 Components

1. Sensor - is threaded into the header to get samples of exhaust.

2. Controller - receives the  the samples taken by the sensor converts them to fuel type and formats the info for the recorder. The controller also handles the heater circuit and calibrations.

3. Vnet connector - connects the O2 "system" to the recorder network (just like fuel pressure or boost)

Wire lengths:

1. Sensor - 12"
2. Sensor plug to controller - 36"
3. Vnet plug to controller - 16"
4. Power - 46"


Bung Installation

Bungs should be installed 12-15" form the flange 
O2 bungs are to be welded in a primary tube 8-12" forward of the collector. Some racers get away wit using one a collector but usually will experience choppy readings at lower RPM.    Click to expand

 Here is a link to a Vid showing where the guys with the unlimited budget put their O2 bungs http://www.youtube.com/watch?feature=player_embedded&v=p53oEbTGJkU#!

Below is a set of Pro-Fab headers with the bungs about 3" from the flange.

Roush Dyno Cell