Datalogging on the FK8 is a very beneficial thing that any Type R owner should regularly do. Even without Hondata or KTuner, you can log many of these channels via OBD2 with something like the Torque app. Many problems such as boost leaks and bad fuel causing knock can easily be detected by a quick glance at a datalog.
Generally, datalogging is as simple as pressing a button to start and stop the log and downloading it to your laptop later for review. Every sensor will be recorded so you can see exactly what was happening in the entire vehicle at any given time.
Available Data Channels
Airflow
Channel
|
Hondata
|
KTuner
|
Notes
|
Air charge
|
AIRC
|
|
Used as an index for most tables instead of load. Percentage of cylinder filling.
|
Manifold pressure
|
MAP
|
|
Measured in the intake manifold after the throttle body
|
Boost pressure
|
BP
|
|
Measured in the charge pipe before the throttle body
|
Boost pressure command
|
BPCMD
|
|
Technically commands manifold pressure, when BPCMD is -5 MAP will be -5 but BP will be 0psi.
|
Throttle plate position
|
TPlate
|
|
|
Air flow (volts)
|
AFM.v
|
|
The MAF sensor reports airflow in voltage rather than frequency.
|
Air flow (grams/second)
|
AFM
|
|
Found by looking up AFM.v in the AFM flow chart table. Possibly slightly corrected by the ECU.
|
Cylinder air mass (mg)
|
AFM.c
|
|
Not actually datalogged, but calculated as AFM / (RPM / 30) * 1000.
|
Wastegate Position
|
WG
|
|
0mm-8mm
|
Wastegate Position Command
|
WGCMD
|
|
0mm-8mm
|
VTEC Spool
|
VTS
|
|
Whether or not VTEC is engaged. Generally, exhaust backpressure is decreased when VTEC is on.
|
Intake Cam Angle
|
CAM
|
|
|
Intake Cam Angle Command
|
CAMCMD
|
|
|
Exhaust Cam Angle
|
EXCAM
|
|
|
Exhaust Cam Angle Command
|
EXCAMCMD
|
|
|
Atmospheric Pressure
|
PA
|
|
Used to limit boost tables at higher elevation
|
Fuel
Channel
|
Hondata
|
KTuner
|
Notes
|
Injector Duration
|
INJ
|
|
|
Injector Duty Cycle
|
DUTY
|
|
Not actually datalogged, but calculated as INJ * RPM / 1200
|
Fuel Pressure
|
DIFP
|
|
|
Fuel Pressure Command
|
DIFPCMD
|
|
ECU limits this to 200 bars, which is also what the factory and basemap tunes target.
|
Fuel Pump Duty
|
FuelP
|
N/A
|
Special channel added by Hondata only.
|
Air Fuel Ratio
|
AF
|
|
|
Air Fuel Ratio Command
|
AFCMD
|
|
|
Short Term Fuel Trim
|
S.TRIM
|
|
|
Long Term Fuel Trim
|
L.TRIM
|
|
Stored based on RPM. Changes much faster than other platforms.
|
Fuel Status
|
Fuel Status
|
|
Standard OBD2 fuel status.
|
Ethanol Percentage
|
Ethanol
|
|
For FK8s with a flex fuel sensor installed. Replaces the ECT2 sensor.
|
Engine
Channel
|
Hondata
|
KTuner
|
Notes
|
Engine speed
|
RPM
|
RPM
|
|
Oil pressure
|
Oil. Press
|
|
|
Ignition Advance
|
IGN
|
|
|
Knock Retard
|
K.Retard 1-4
|
N/A
|
Only available on Hondata. Degrees of knock retard applied to each or all cylinders.
|
Knock Level
|
K.Level
|
N/A
|
Only available on Hondata. Volume being reported by the knock sensor.
|
Traction Control Retard
|
TC.R
|
N/A
|
Degrees of retard applied to regain traction by Hondata's TCS.
|
Temperature
Channel
|
Hondata
|
KTuner
|
Notes
|
Catalytic Converter
|
Cat.T
|
|
Modelled by the ECU, not physically measured as there is no sensor in the cat.
|
Charge Air
|
IAT
|
IAT
|
Measured at the boost pressure sensor in the charge pipe after the intercooler. Generally IAT2 on other platforms.
|
Intake Air
|
IAT2
|
IAT2
|
Measured at the MAF sensor after the intake. Generally IAT1 on other platforms.
|
Radiator Inlet
|
ECT1
|
|
Temperature of coolant entering the radiator.
|
Radiator Outlet
|
ECT2
|
|
Temperature of coolant leaving the radiator.
|
Oil Temperature
|
N/A
|
N/A
|
There is no oil temperature sensor in the FK8.
|
Vehicle
Channel
|
Hondata
|
KTuner
|
Notes
|
Vehicle speed
|
VSS
|
|
|
Gear
|
Gear
|
|
|
Throttle Pedal Position
|
TPedal
|
|
Corresponds to a torque request table per gear and drive mode.
|
Battery Voltage
|
BAT
|
|
|
Wheel Speed
|
ABS.LF/RF/LR/RR
|
|
Not available on 2020+ due to new suspension controller.
|
Clutch Position
|
Clutch.Pos
|
|
|
Brake Pressure
|
Brake.Press
|
|
|
Steering Angle
|
Steer Ang
|
|
|
Steering Torque
|
Steer Trq
|
|
|
G Sensor
|
G.Lat/G.Long
|
|
|
Yaw Sensor
|
Yaw
|
|
|
Wheel Slip
|
TC.Slip
|
N/A
|
Percentage of wheel slip as reported by Hondata TCS.
|