AEM 30-71XX Infinity Stand-Alone Programmable Engine Mangement System Full Manual User Manual
Page 301
EFI Components
295
© 2014 AEM Performance Electronics
Turbocharged Piston Engines W/ Pent Roof Combustion Chamber
Air/Fuel Ratio
L
300
13.0:1
12.5:1
12.2:1
12.2:1
12.2:1
12.2:1
12.2:1
12.2:1
O
275
13.0:1
12.8:1
12.5:1
12.5:1
12.2:1
12.2:1
12.2:1
12.2:1
A
250
13.0:1
12.8:1
12.5:1
12.5:1
12.2:1
12.2:1
12.2:1
12.2:1
D
225
13.0:1
12.8:1
12.8:1
12.8:1
12.5:1
12.5:1
12.5:1
12.5:1
200
13.0:1
12.8:1
12.8:1
12.8:1
12.5:1
12.5:1
12.5:1
12.5:1
I
175
13.0:1
13.0:1
13.0:1
12.8:1
12.8:1
12.8:1
12.8:1
12.8:1
N
150
13.0:1
13.0:1
13.0:1
13.0:1
13.0:1
13.0:1
12.8:1
12.8:1
125
13.0:1
13.0:1
13.0:1
13.0:1
13.0:1
13.0:1
12.8:1
12.8:1
K
100
13.0:1
13.0:1
13.0:1
13.0:1
13.0:1
13.0:1
12.8:1
12.8:1
P
75
14.0:1
14.2:1
14.2:1
14.2:1
14.2:1
14.2:1
14.2:1
14.2:1
A
50
14.0:1
14.7:1
14.7:1
14.7:1
14.7:1
14.7:1
14.7:1
14.7:1
25
14.0:1
14.7:1
14.7:1
14.7:1
14.7:1
14.7:1
14.7:1
14.7:1
Idle
Maximum
RPM
The AFR is often referred to as a Lambda (l) number. A Lambda of 1.00 is equal to the
stoichiometric ratio for the reactants in a system. For our purposes, the stoichiometric ratio is the
ratio for the amount of ANY fuel used in an internal combustion engine. With Lambda
measurement, any number higher than 1.00 is considered lean (more air than necessary to react
with the fuel) and any number lower than 1.00 is considered rich.
Although Lambda is the term most often used when working with O2 sensors, we will use AFR in
this manual because it is the most common term used when referring to internal combustion
engines. The following is a chart for converting Lambda values to AFRs.