Reduction in consumption: theory and application on JTDm

[SandroMarciano]

Then you have written so much and not likely to succeed? to answer you all...
I tried to reduce the preiniezione is to increase it by varying the advance of the main, I made your same ideas, however, in practice the fuel consumption and performance ? always better to increase it (even if they are exaggerating, you get the beat of the engine), and of course, working on the advance of the main (which, according to me, that is, the rule so important to the consumption and delivery).

The elimination of the regenerations for many years now it is only from the control unit, eliminating the management dpf and the postiniezioni that serve for its regeneration.

I also worked on the mjet2 170 on preiniezioni, however ? well pi? complex and having the dpf you have many more? variables, for which ? difficult to see the difference between before and after the change. Anyway, on that engine, the PI1 is always working, while the PI2 only at very low rpm, typically up to 2000, probably to reduce vibration...

[ghibli]

ok, so... if you wish "to generalize," you could say that (I am referring to the 1.9 JTDm 120 or 150):
- physical removal of the DPF and the ecu to avoid regenerations and also post injections;
- increase pre-injection in the bosom of the deal? diesel fuel is injected;
- advance of the main injection;
- total closure of the EGR;

Should all of them together to reduce their consumption. Correct?

Of course, it remains a question of why? increase the preinizione decreases the consumption... but perhaps it is the mysteries of fluid dynamics of the air mixture (fuel/oxygen... or the fact that poor preiniezione with injection main "normal" generates a condition that is not ideal to take maximum advantage of the fuel (probably induced by the compression ratio tends to be "low" compared to Diesel).

What do you think?

[Exelion1986]

as you said in the first post there are several factors that contribute to the consumption of a car, most of which cannot be influenced by the average user (aerodynamic resistance, the performance of the transmission...), while others (inflation pressure of the tires, the fact that you do not hold 50 kg of useless stuff in the trunk...)
putting the hand to the mapping you can? also intervene in other ways, or the possibility? to vary the operation of the engine, and the only thing that matters ? the efficiency of the motor itself, that can? improve or worsen depending on the intervention
also in this case we have many types of engine performance, many of which are congenital and are not editable via the map (mechanical efficiency, for example)
in fact, according to me, the returns on which we dwell, are two: that of burning and that of cycle indicator
the first tells us in practice "good," burning the fuel, while the second indicates how much energy (derived from the combustion), we can take advantage of, considering the fact that the motor does not operate according to a cycle
by altering some of the parameters of the mapping, we can have variations of one or both of the yields in the examination
by increasing the pressure of the rail, for example, we will have a better atomization of the fuel and, consequently, an improvement in the combustion
playing instead on the advances we're going to vary the diagram the pressure/volume loop (by moving the peak pressure), and, therefore, the performance of cycle indicator, but potentially also the combustion efficiency because, if you go out of range, the diesel fuel can't burn well
the preiniezioni serve to "prepare" the combustion chamber of the main injection, increasing the pressure and temperature of the air (in the diesel fuel is hard to ignite)
it goes from the s? in this way, the main charge brucer? definitely the best (the best combustion efficiency), with a consequent decrease in the consumption
the postiniezioni, however, happen in the phase of completion (almost at the end of combustion) with the purpose of reducing the pollutants, allowing you to complete the chemical reactions regarding the unburned hydrocarbons, or are related to the regeneration of a dpf possible
however, in both cases, the postiniezioni do not contribute to the performance of the engine

[ghibli]

...Here Is Exelion. Then in the concrete what you tap on the map to improve these two yields and reduce to the maximum consumption? The list of the 4 points that I made more in on or the other?

[Exelion1986]

I have to say that I'm still a newbie in practice, at the moment I know only the theories
certainly the elimination of the egr and dpf helps
with regard to the change of the preiniezioni I would say that the speech of SandroMarciano not a fold
going to logic I would say that the advance has its good influence, but personally I can not say how it reacts to the engine depending on how you change it, for now I'm doing tests on a 1.3 (pi? next I should be able to find a guinea pig 1.9) and on the advance and I still have to put his hand calmly
lastly, I would add to your list also the rail pressure, which in theory should help, but reading a p? around the forum I find conflicting opinions on the fact that worth or not to touch this parameter... probably his influence ? very minor compared to the other
the only according to me ? get to do many tests, to understand that weight is of all the various parameters, why? often the transition from theory to practice ? cos? immediate...

[ghibli]

Certainly of the test are the best solution.
Do you know someone who has the interest to get them on one machine (my), where there can be a profitable dialogue in order to find the best possible solution together?
It would be good to locate someone in the area Emilia/Piemonte/Lombardia/Tuscany....

Thanks
G.

[francescosparco]

I'm on a 159 150 hp have managed to reduce the consumption from 9 to 12 per liter. pero according to my best to be careful. sn cars that suffer from very d turbo

[ghibli]

Hey Francis,

you never consumed so well? little already? before the map?
You, ? true, suffer from turbo.