SM4 Manual
by
MRM-Racing
V3.0
85
Example:- Roughest point at idle = 370
370 - 50 = 320
RPM
1000 6000
320 280
NOTE: Y axis also used by Injection cylinder trims.
Target A/F
Target A/F ratio table.
Used by CLC (Closed Loop Control) and Autotune as the target air fuel ratio.
Set air fuel ratio values you require CLC or/and Autotune to tune the engine too.
Below is an example table for a turbocharged engine. There are many engine variables
that affect the required air fuel ratio, plus fuel octane and the application the engine will
be used. A engine used for drag racing can use leaner mixtures than an endurance
engine.
RPM
Load
1000
1500
2000
3000
4000
6000
30
13.5
13.5
14.7
14.7
14.7
14.7
50
13.5
13.5
14.7
14.7
14.7
14.7
70
13.5
13.5
14.7
14.7
14.7
14.7
90
13.5
13.5
13.5
14.7
14.7
14.7
100
12.7
12.7
12.7
12.7
12.7
12.7
150
11.8
11.8
11.8
11.8
11.8
11.8
200
11.2
11.2
11.2
11.2
11.2
11.2
220
10.8
10.8
10.8
10.8
10.8
10.8
A/F ratio table.
Fuel trims
Sub menus contain
•
Individual cylinder trims 1..8
•
Auxiliary fuel compensations 1..3
•
Charge temperature estimation table
•
Baro pressure estimation table
X & Y axis setup in "M2 tables axis setup".
NOTE, If any trims set, will be shown as "ON".
WARNING THESE SETTINGS IS ENGINE DEPENDENT.
WARNING
Using different values at high rpm from low rpm can make the engine to stumble at
some rpms. Try to one value only.
