FAST Wideband Datamaster Logging

[Fox Slaughter]

In this tutorial I am going to tell you how to log your AFR in Datamaster using a FAST Wideband. A lot of guys are using a LC1 wideband, but I am using a FAST Dual Wideband.

So I spent a lot of time trying to find the voltage related to the AFR and then using the AC Pressure switch to log it into Datamaster instead of having to look at my controller.

So first you need to wire the analog output to your AC Pressure switch, do a search you will find how to do this.

Here are the voltages and AFR for a FAST Dual Wideband.

9.555=0
10.29=.2744
11.098=.5488
11.833=.8232
12.642=1.0976
13.377=1.372
14.112=1.6464
14.92=1.9208
15.655=2.1756
16.464=2.45
17.199=2.7244
17.934=2.9988
18.742=3.2732
19.477 =3.5476
20.286=3.822
21.021=4.0964

Now you may ask how will this help when the AC Pressure switch uses PSI. Well there is some math involved in translating this.

Volts = 5N/255, so 5/255 = .019608. So Volts = 0.019608*N
AFR = 2.8(V) + 9.61 is the Formula for the FAST Wideband.

So 2.79*.019608 = .05488.
.054488*N+9.6 is the formula.

So open DataMaster. Go to View, Custom Data. When it pops up, Click To Assign.

Here are the settings.

Variable Enabled
30
Air/Fuel Ratio (What ever you want to put here)
Wideband o2 (Whatever you want)
AFR
.05488
9.61
INT
0.00

And thats it.

Now when you log you can look at the custom data and it will show your AFR.

[meissen]

This is probably a dumb question but this can only be done if you've deleted AC, right?

[WMCCjames]

This is probably a dumb question but this can only be done if you've deleted AC, right?

No....you can use other inputs as well. You can even put a switch inline so you can switch back and forth between W/B and the designated input.

[meissen]

Cool - I might give that a try then with the TunerPro RT program too.

[Fox Slaughter]

^ As stated earlier. Joel has a switch inline to switch between AC and Wideband. Since I have Dual widebands I might use the EGR valve to relay the 0-5v from my other o2.

Also with your wideband the linear equation is going to be different, so you will have to type in different numbers to display the AFR correctly.