Best to think about it comparing to spark advance in gasoline, piston has to be passed TDC and on the way down (over 15°)when combustion process finishes for best torque

OK :D So my values are safe right?

Here's a log of my SOI

sparco wrote:Here's a log of my SOI

Nice graph :thumbup: How can i do that? I only have lexia and i cant datalog like that :(

yes you can with lexia, PP2K and diagbox.
The logs are stored in the OUD folder under C:/
After that you extract the data in excel and create the graphs.

This was done with a BT ELM adaptor and FAP for Citroen and Peugeot Android app

without proper sensorics you can only adjust SOI based on which EOI you think you wish to have...and to do that you need to recalculate duration time into degrees over rail pressure to get duration time in degrees and based on soi to calulate eoi, and taking into account different axis values for rpm and fuel....

to know if you did a good job you need to measure pressure inside the cylinder to monitor combustion process and also to monitor how pressure drops when exhaust valves open...and so on...than you know if your soi related to rpm, amount of fuel, injection duration, rail and bunch of other things...is good or bad (by the way we do that... ;) )

ecuedit wrote:without proper sensorics you can only adjust SOI based on which EOI you think you wish to have...and to do that you need to recalculate duration time into degrees over rail pressure to get duration time in degrees and based on soi to calulate eoi, and taking into account different axis values for rpm and fuel....

to know if you did a good job you need to measure pressure inside the cylinder to monitor combustion process and also to monitor how pressure drops when exhaust valves open...and so on...than you know if your soi related to rpm, amount of fuel, injection duration, rail and bunch of other things...is good or bad (by the way we do that... ;) )

@ ecuedit

Mind taking a look? Discussion about conversion from uS to CR°

EGT, EMP and smoke are also good indications of those parameters and most of the time cheaper to implement (if it's a personal build).
The peak cylinder pressure probe is a nice to have gadget, especially on customer cars to use for development, but I wouldn't call it a necessity. installing it in the glowplugs place could still cause you a world of pain, when they don't want to come out as well.

@jurebv; all you need is a datalog with SOI, RPM and duration. you don't need railpressure to calculate EOI from those.

5th post in this topic talks about my calculations
https://www.ecuedit.com/peugeot-207-1-6hdi90-edc16c34-379395-t4689/page20

Daamn i never had a good thread like this :D

So, u used the car for 100km's and averything "looks" fine. Ecuedit, i did exactly what you say. I build an app to help me with automatic interpolation and it build the tables automaticly and in real time. When i have time i can show it!!

So, to resume: The car that i'm using is my daily drive car, but either way i'm going to use it for testing.

-I'm going to install an EGT sensor and monitor the temps! What values should i look for? Should i compare the old vs new?
-Smoke? Only when pushing really hard (or bad weather) and it just "brease". My afr is low but still no smoke coming out.
-Pressure inside the Cilinders? Mhmm i need to buy thoose gauges (usualy for petrol isnt?) and put it where? I dont have spark plugs to remove :D;
-And i'm going to datalog when i have time;

I'll leave the file below of my "stage 2" to anyone who want to look around.