Technical Information Tuning the K20c Civic Type R

1. Load any calibration to start with. /// (Do not use Civic Type R FK8 US 2017, stock equivalent or Civic Type R FK8 US 2019, stock equivalent. These are intended only to be treated as a **STOCK MODE** Conduct test runs in sport mode or R mode)

2. Baseline car. Pay close attention to BP, BP Cmd, AirC, Knock Retard 1,2,3,4 , AF, AFCmd, Ign(Ignition)

3. To raise or lower boost over what has already been preset, Goto: window--->calibration--->boost control--->Air charge limit (AirC (%)) /// The option exist to alter the Turbo max ratio (PA) comp (IAT2) if you desire adjust its effect on the air charge limit.

4. While tuning you can also alter both the Turbo max ratio (PA) and Turbo max ratio (temp) to fine tune there effectiveness based on operating conditions. These numbers function as a ceiling.

x – atmospheric pressure, y – rpm, table data – bar absolute

x – iat2, y – rpm, table data – bar absolute

5. Keep an eye on the Fuel Pump Duty, the DIFP and DIFPCMD because the weak point of the CTR is the fuel system which tends to run out of fuel. Especially when raising the boost and/or adding ethanol. I’d say keep the max duty on dyno and/or street to 90% to give you some room for overshoot as well as to aid in keeping the pressure from dropping and causing an error condition. 

6. Another variable that will affect the boost commanded is the Torque Tables. For example, raising the torque request from 480 to 504 will yield more boost in some areas. Note: all boost gains won’t equate to power gains; especially up top.

x – tps, y – rpm, table data – requested torque

7. If you want to change the target afr, Goto: window--->tables---> and adjust all 3 tables: Target lambda (cat protect), Target lambda (VTEC) (cat protect), Minimum lambda (cat protect) ...make all three tables the same values. Note: be careful when altering these tables as they change the load on the fuel system and you can potentially max out the system and cause an error condition. I.E. 3321 rpm, 23.6 PSI , 94% fp duty, 13.07 afcmd… If one were to demand 10% more fuel at that point, it will peg the fuel pump at 100% and drop the fuel pressure. The only options are to lower fuel demand by leaning the mixture, lowering boost, or lowering ethanol content.

X – air charge, y – rpm, table data – target afr

8. Verify no audible detonation is present, as well as knock retard staying as close to 0 as possible. If knock is detected indicated by knock retard or audible ping, lower the ignition timing and/or boost in that area. You may find it easier to make all 8 ignition tables above 100% AirC the same to eliminate ignition as a variable when indexing cam and boost level changes. Extensive re-tuning of the car should be done if you choose this method to verify drive-ability, functionality, etc. Be careful with timing down low. A typical ctr will see 0deg at peak torque (~280kpa///AirC>=230) and 9deg at peak hp (~235kpa///AirC>=175).

x – air charge, y – rpm, table data – ignition timing


1. Boost By Ethanol Limit – this table works in addition to the air change limit table when the ethanol input is enabled. The ecu will take the lowest value between the 2 tables. The setup below shows as ethanol content goes up; the air charge limit will be decreased to keep the fuel pump from maxing out

x- ethanol content, y – rpm, table data – air charge limit

Those wanting further control over the target boost. Toggle the highlighted area below. This mod is effective Flashpro Manager version 3.4.3 and up. Pay close attention to the warning below.


For those that have been tuned, etc; it is advised to consult with your tuner or follow the directions below if you have a basic understanding of tuning. 

Closely watch the boost curve and do not to allow the WG actual to rest a 0mm for any period of time as you may send the turbo into overspeed and possibly damage the turbo and/or engine. 

Special Attention to those that have highly elevated or maxed out values concerning air charge, requested torque, etc.… If you toggle this mod the ecu will give all the boost mechanically available. See below for a suggested starting point to make sure your tune will function as intended.

1. Turbo max ratio (PA), Turbo max ratio (temp) – return to off the shelf Arizona-California-Nevada 91 basemap values for initial test

2. Requested Torque -  1-6 C,S,R – return to stock or off the shelf Arizona-California-Nevada91 basemap values

3. Air Charge Limit – return to otsACN91 basemap values. To be completely safe limit max air charge to 200 for initial test.

4. Boost by ethanol limit – the ecu will take the lowest of this table vs Air Charge Limit. Set accordingly…