Is the injection start time counted differently in PD?

Hello,

In the log of my engine, the start of injection (which is the start of fuel injection in PD engines, group 004, block 2) appears with a negative sign compared to the AFN and ALH engines.

At 1900 rpm and 25% throttle, the reading is "-3.7". During the subsequent acceleration, the absolute value increases to "-21.7" at just under 4000 rpm.

Reading this from the perspective of the VP-Logs, the start of the boost is shifted later rather than earlier, with increasing load and speed.

Is this reverse counting method in the PD-Logs normal, or do I have a bug somewhere in the system?

hi,
For me, it just makes sense.
The injection starts before the top dead center (TDC) and is negative.
greetings

PS: But maybe the performance is lacking there.
because your engine injects fuel after top dead center .

PowerSound3L wrote:

PS: but maybe that's where the missing performance is. because your engine injects fuel after top dead center

.
Hmm, but being about 40° out of phase (20 degrees after top dead center instead of before) likely costs more than just 20 horsepower (if we're being generous -> 134 horsepower according to the DZR instead of the 154 that are theoretically possible with extreme positive variation in the air-standard cycle)?