Misfire (like) at high RPMs

EMU BLACK / CLASSIC
1

This text has been translated from Japanese by machine.
Please forgive any incorrect expressions.
The vehicle specifications are as follows.

  • 1300cc 4-cylinder with turbocharger
  • Injector is DW440cc
  • Trigger pattern is 36-2+N-1 (almost the same as Toyota 2ZZ)
  • The firmware is V3 3.044

Currently, I am experiencing the following phenomenon.

  • Reach the maximum boost pressure around 5500rpm or higher, you will feel something stuck (along with the sound, like a misfire is occurring)
  • Increase the rotation with the TPS opening degree low so that maximum supercharging does not occur, nothing will happen.

First I suspected a trigger problem.
However, I didn’t see any trigger errors and nothing seemed to be happening in the logs.
Next I tried retarding the ignition timing. This didn’t make any difference.
I then tried raising the knock threshold to see what happened. This didn’t make any difference either.

Have I done something wrong with the settings?
Any advice would be appreciated.
The files and logs are below.

QNC10_K3VET.emub3 (64.2 KB)
20250218_1323.emublog3 (1.6 MB)

2

I see no cuts in your logs
There are knock hits at throttle closing due to too much overrun timing but that is not the case
i suspect you are getting missfires from rich mixture when boost comes
I suggest to use a map referenced fuel pressure regulator and check your ve table again

3

Thanks for your response.

I’ll check it over the weekend.
I couldn’t see any noticeable lean spikes on lambda, so I was thinking of other possibilities.

4

I tested it today, and the same misfire-like phenomenon occurred.
I noticed while looking at the log that the knock detection flag was ON even though it had not yet reached the threshold (I.KScorrection).
The knock ignition correction value was also increasing, but the actual IgnitionAngle was not changing.
I will stop the knock sensor action and check.