change advances

[asdone]

For me you can? do a proportion to determine the trend, but you must keep in mind that the advances are out of step with the times of injection, and then with the pressure of the rail. At a certain point, the rail is not allowed? pi? climb in and advances rise considerably. Then the proportion must be done with the degree and the duration of injection (which can be calculated knowing the rail & rev) and not with the amount? of diesel fuel. Of course, there are some physical limits of the engine that I know of but ? better not to cross

[checchitotiralaleva]

Very correct reasoning asdone.
I fully agree!

[dariuccio]

I have noticed improvements in anticipation of even a few degrees splash, engine more spirited and more inclined to quickly climb rpm

[checchitotiralaleva]

Well, as a gi? said the margin in tranquility? I think there is always on the calibration of the current engines, very, very important to never enter discontinuit? in the map of the advances. The swaging of the changes ? indispesabile in my opinion

[asdone]

I would like to do a test to understand how and how much the advances affect the behavior of the engine.
I would like to reset all of the maps in advances from 1500 rpm up to the value of pi? high at that rpm, line-by-line.
Of course, for educational purposes only, I do not mean to make us the most? of a few km.
According to you, the risk of breaking something? I think not, anyway, not oltrepasserei the maximum values!

[dariuccio]

the diesel engine, unlike the gasoline ? almost immune to explosions, well I hope for the connecting rods, but...

[asdone]

I speak of the maximum of the original values, around x around, not to bring the whole map at 20 degrees from 1000 rpm, the one that would be destructive :P

[checchitotiralaleva]

Eye Asdone,
definitely not overcome the pressure within the cylinder maximum, but definitely deformerai the pressure curve inside the cylinder cycle.
With the effect that the machine at medium loads could start to make noise (beat) and now go worse as it goes into the source.

With a medium amount? injected, to anticipate the maximum value that you see for the scheme considered (at the time of the high-introductions), you could bring it to the finish injected before TDC. There? it may be that the peak of maximum pressure to go to work not in a phase of expansion, but also against the compression phase. making you lose the benefit of the increase in the pressure within the cylinder.

If you want to do something extreme for educational purposes, without having a pressure sensor inside the cylinder, I would recommend you to calculate all the advances for chamfering the end of each injection, close to the TDC.
In this way you would also get a map with developments connected to the function of the introduction for each regime.

Ciaooo

[asdone]

You probably injected finishes first, for? before you start to bring pressure to pass the time, and that time is set to its maximum value acceptable for the manufacturers to limit the right of the maps advances, at least in cos? I think.

Connect all the points by simulating the operation of the ecu by interpolating laps rail ? a big problem, surely NOT ? to be done by hand, and you hardly can? do with excel...
We would have to write a program that does that,

Anyone here ? interested in starting a little project? Or do you know already? a software that can do it?

[asdone]

In this regard I have started a discussion here http://www.professionalchiptuning.ne...8174#post88174 for those who are interested