Stag AFR - 4 Installation

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4
to make precise adjustment of the fuel system to ensure optimum engine power, while having reasonable
fuel consumption.
STAG AFR is provided with an analogue 0V to 5V output. It can be used to connect an external AFR
indicator, as well as chassis dynamometers with an analogue input for the AFR reading, external data
loggers and standalone/piggyback type ECM units. Activation of the option requires connecting an
additional cable included in the kit to the harness, in accordance with fig. 1. Relation of the analogue
output voltage level to the AFR and Lambda value has been presented in Table No. 1.
Lambda
AFR (Pb)
Voltage [V]
0,7
10,29
0
0,73
10,73
0,25
0,76
11,17
0,5
0,79
11,61
0,75
0,82
12,05
1
0,85
12,5
1,25
0,88
12,94
1,5
0,91
13,38
1,75
0,94
13,82
2
0,97
14,26
2,25
1
14,7
2,5
1,03
15,14
2,75
1,06
15,58
3
1,09
16,02
3,25
1,12
16,46
3,5
1,15
16,91
3,75
1,18
17,35
4
1,21
17,79
4,25
1,24
18,23
4,5
1,27
18,67
4,75
1,3
19,11
5
Table 1. Analogue output voltage vs. AFR and Lambda value.
4. Installation
The STAG AFR controller is designed to be used inside the passenger compartment of the vehicle. The
controller should not be mounted inside the engine bay or other locations exposed to moisture or high
temperature.
The controller is powered by a standard 12 V cigarette-lighter socket. Ensure that the oxygen sensor
connector is connected to the controller harness properly before plugging in. When connected to the
socket the green LED in the plug should be on. If this LED is off, while the plug is inserted properly and
the socket is active (the key is put into the ignition at appropriate position), check the fuse in the power
supply plug. Replace with a new one of current rating: 5-8 A.