Stack LAMBDA Guide D'installation page 6

IMPORTANT!
AFR values and stoichiometric points change with fuel type and with the particular blend of gasoline being utilized. The information shown
below assumes Unleaded Gasoline with no ethanol content as the basis for the information presented. The chart below provides a reference
for a variety of common alternative fuel types.
Fuel Type
Unleaded Gasoline
Methanol
Ethanol
LPG (Propane)
CNG
E85
The target operation modes shown below are suggestions intended only as a baseline / starting reference for interpreting sensor information
based upon Stack's experience working with different vehicle types and professional builders.
There are many variables involved in each engine build and use which make it impossible to accurately provide a single chart which address
ideal air / fuel mixtures for every combination. It is the ultimate responsibility of the user to confirm proper target values and calibration for
the application. Stack holds no responsibility for improper use of this product that results in engine damage. We recommend that you consult
your tuner or engine builder for specific values appropriate to your application as they may vary from the chart below.
Target Operation
Out of Range
High Boost Forced Induction and Air
Cooled Power
Low Boost Forced Induction &
Naturally Aspirated Power
Idle, Part Throttle, Cruise & Economy
Lean
Too Lean - Detonation, Misfire, and
Engine Damage May Result
Out of Range
Lambda
1.00
1.00
1.00
1.00
1.00
1.00
Lambda
0.59
0.61
0.62
0.64
0.66
0.68
0.72
0.76
0.80
0.85
0.89
0.93
0.97
1.00
1.02
1.06
1.10
1.14
1.19
1.23
1.27
1.31
1.36
1.37
1.39
1.41
1.42
1.44
Stoichiometric Air / Fuel Ratio
14.7:1
6.4:1
9.0:1
15.5:1
17.2:1
9.8:1
AFR (Gasoline)
8.8
9.0
9.3
9.5
9.8
10.0
10.6
11.3
11.9
12.5
13.1
13.8
14.4
14.7
15.0
15.6
16.3
16.9
17.5
18.1
18.8
19.4
20.0
20.3
20.5
20.8
21.0
21.3