Datalogging

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.

Hondata FlashPro tips

• Always datalog on the FlashPro itself as the desktop software tends to not have nearly as high of a resolution.
• You can press the record button on your laptop and on the FlashPro at the same time so you can watch graphs live and review them in high resolution later.
• There's no maximum length to a datalog and they can be cut up into smaller logs, so just press record and drive. It will take longer to download a longer datalog though.
• The datalog will continue to record on the FlashPro even if ignition is turned off and back on. Don't leave the recording running overnight or you'll have a massive datalog to download. You have to stop the recording.
• The ECU starts reporting sensor data as soon as the ignition is keyed on, regardless of whether or not the engine is on. Knowing this, you can capture a log of the engine cranking up or see what happened when you stalled out.

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. Cannot be changed and Hondata/KTuner will not be adding the ability to do so.
Wastegate Position Command	WGCMD
VTEC Spool	VTS		Whether or not VTEC is engaged. Generally, exhaust backpressure is decreased when VTEC is on.
Intake Cam Angle	CAM		-25 to +30 degrees. Negative value indicates advance, positive value indicates retard.
Intake Cam Angle Command	CAMCMD
Exhaust Cam Angle	EXCAM		-25 to +20 degrees. Negative value indicates advance, positive value indicates retard.
Exhaust Cam Angle Command	EXCAMCMD
Atmospheric Pressure	PA		Used to limit boost tables at higher elevation and properly calculate a ton of other things

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. You may see 250 bars at startup or when letting off the pedal at redline, this is normal.
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		Sensor is located on the cylinder head and is not an accurate representation of pressure throughout the system.
Ignition Advance	IGN		Always in degrees of 0.75, but FlashProManager rounds it.
Knock Retard	K.Retard 1-4	N/A	Only available on Hondata. Degrees of knock retard applied to each or all cylinders. Also in degrees of 0.75.
Knock Level	K.Level	N/A	Only available on Hondata. Noise being reported by the knock sensor. Generally not useful.
Traction Control Retard	TC.R	N/A	Degrees of retard applied to regain traction by Hondata's TCS.

Temperature

Note that IAT1 is post-intercooler and IAT2 is pre-intercooler, which is backwards from earlier Honda applications. This is true for both Hondata and KTuner - the sensors are the same between the tuning platforms. Hondata has stated what the values correspond to in their tuning notes and KTuner explained on their forums that IAT1 is post intercooler on their platform as well.

Temperature	Hondata	KTuner	Notes
Catalytic Converter	Cat.T		Modelled by the ECU, not physically measured as there is no sensor in the cat.
Post-Intercooler	IAT1	IAT1	Measured at the MAP sensor after the throttle body. Generally IAT2 on other platforms.
Pre-Intercooler	IAT2	IAT2	Measured at the MAF sensor after the intake. Generally IAT1 on other platforms.
Radiator Inlet	ECT1		Temperature of coolant exiting the engine.
Radiator Outlet	ECT2		Temperature of coolant after the radiator. If a flex fuel kit is present this sensor is connected to the ethanol sensor instead.
Oil Temperature	N/A	N/A	There is no oil temperature sensor in the FK8. 2020's have the LogR app that mathematically models it, but accuracy is in question.

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.