Ballenger Motorsports AFR500v2 Manual Rev 1.4a - 13 -
5.
Your AFR500 may read 16.00, Air
ˉˉ
, Air_, or CAL– before
engine startup or when letting off the throttle of a fuel injected
vehicle, this is normal.
6.
Recheck the sensor periodically. Sensor drift will depend on
use where a well tuned street vehicle will need rechecking less
often than a leaded fuel dragster.
7.
Disconnect power from the AFR500v2 harness. Once the
sensor cools down, install the oxygen sensor. Take care, it
will be hot for a long time! Take care not to bump or knock
the calibration knob on the AFR500v2 until your next
calibration!
12. Analog Output
The AFR500v2 has a 0v to 5v linear voltage output where 0v is equal
to 9:1 air-fuel ratio for gasoline and 5v is equal to 16:1 air-fuel ratio
for gasoline. In extreme range mode, 0v is equal to 6:1 for gasoline
and 5v is equal to 20:1 for gasoline. Take care to wire the analog
output and ground. The main ground and analog ground should be
connected to the same location to avoid a ground loop or shift.
13. Analog Output Values
When set to Wideband (Standard) Range:
Gasoline AFR (9:1-16:1)
=
9.00 + Vout x 1.400
Methanol AFR (4.00-7.10)
=
4.00 + Vout x 0.62
Lambda (.618-1.098)
=
0.618 + Vout x 0.096
When set to Extreme (FI Methanol/Lab) Range:
Gasoline AFR (6:1-20:1)
=
6.00 + Vout x 2.800
Methanol AFR (2.66-8.88)
=
2.66 + Vout x 1.244
Lambda (.411-1.373)
=
0.411 + Vout x 0.1923
Ballenger Motorsports AFR500v2 Manual Rev 1.4a - 14 -
It is important to observe any analog offsets. Any analog input in a
logging system may suffer from a voltage offset, requiring that you
always check your analog values against a known reference. In the
case of the AFR500v2, there is a special provision for this.
During startup, the AFR500v2 will output 1 volt (10.4 AFR or 8.8
AFR in extreme mode) until the countdown timer reaches 15 seconds.
At 14 seconds until 5 seconds, the countdown timer will output 4
volts (14.6AFR or 17.2 AFR in extreme mode). During the final 5
seconds, the AFR500v2 will output 0v (9.0AFR or 6.0 AFR in
extreme mode). Using these values, expect to correct within a
variation of +/- 0.08 volts
14. Display
The AFR500v2 offers display of air fuel ratio in Gasoline AFR
(default), Methanol AFR, & Lambda. Lambda provides the most
flexible display option for modern mixed fuels, as stoichiometric
combustion in all compatible fuels will display as a lambda value of
1. As with AFR, lower lambda values are richer and higher values are
leaner.
15. Compatible Fuels
The AFR500v2 is widely fuel compatible. Many are listed below:
Gasoline / Petrol (leaded or unleaded)
Alcohol (Methanol)
Ethanol
Compressed Natural Gas (CNG)
Liquefied Petroleum Gas (LPG)
Propane
Many other combustible fuels
16. Troubleshooting
Error codes will be displayed on the AFR500v2 screen if there is a
problem. “Bat” indicates a voltage out of range. “SEn” indicates a
problem as indicated in the chart below:
