Jerky Throttle Response From Partial Throttle

[Newing]

Hey there!

I have a 2018 Honda Civic si, and I have a question regarding Hondata's off the shelf +6 psi basemap (enabled by sport mode).

I have noted a "strange boost ramp" both in and out of sport mode. After reflashing the car, I had thought my issues were resolved. My rich WOT AFR seems fine now, but I still have a strange fuel mapping/jump. The boost pressure and power will be higher at partial throttle vs WOT.

I can see that as I ramp up the throttle my target AF and AFCMD values suddenly jump from ~14.7 to 11 between 80% and 90% throttle. The boost command also suddenly drops ~2psi once at full throttle. This is the issue I had thought was from the ""Throttle | Sensitivity" setting in Hondata, however even after I disabled this feature and reflashed the car it still persists.

Long- and short-term fuel trim stays +/- 5%. I apologize about the poor-quality images, but if anyone wants to take a further look, I have a zip file of my logs attached.

Log004_Image at 83% Throttle:

Note that this was taken without sport mode enabled. Boost pressure & command @ ~20psi, AFR @ 14.7, no knock, -14deg of timing.

Log004_Image at Wide Open Throttle (90%):

Note that boost pressure and command is now @ 17psi, AFR @ 11.0, no knock, -9deg of timing.

Is this normal? I feel like this is just how the tune is pre-set, and I have reinstalled Hondata numerus times, and gone through as much as I can to fix this issue without modifying the fuel tables/map itself. Any feedback would be greatly appreciated.

Check out my discussion on the CivicX.com website https://www.civicx.com/forum/threads/th ... st-1340383.

[Newing]

I decided to inspect the issue, so I just got done with at 45min datalog. The datalog was split between the +6 psi and stock mode. The issue remains the same as shown above. Apparently, 90-95% "TPedal" is the max throttle pedal position while ~101% "TPlate" is the max throttle body position? I have now seen both.

Unfortunately, it would seem the throttle map for 65-85% throttle pedal position asks for a target AFR of 14.7, a peak boost target of ~20psi (stock) and ~23psi (sport) and a target throttle body position of ~101%.

Meanwhile at WOT (90-95% throttle pedal position) it asks for a target AFR of 11.2, a peak boost target of ~20psi (stock) and ~23psi (sport) and a target throttle body position of ~90%. That seems weird to me, so I'm a post up to the Hondata forums and ask to confirm.

Here is some data from the log:

[Newing]

Here is some additional information about the tune I would like to note. I have not tried every combo of throttle response but here are the options:

Response standard [as shown in log above]
Response Stage 1 [issue persists]
Response Stage 2 [untested]
Response Stage 3 Improved [untested]

Sensitivity standard [as shown]
Sensitivity Stage 1 [issue persists]
Sensitivity Stage 2 [untested]