MARELLI MJET impariamola!

[Danny]

Munro I can to? tell you, having the shot to the limiter, if I raise more than 30% in the last corner, he smokes like a damn each tap that...

[Fede78]

I simply tell you that to inject, for example, 20mm3 of diesel with 800 bar rail, the injector has to stay open for 100 microseconds(random numbers), if the ecu wants to inject always the 20mm3 of diesel but this one is 1600 bar...the time in which to hold the injector open is not allowed? increase it to remain 100 uS...because obviously the more pressure diesel fuel means more fuel with the same time opening the injector....ergo, the injection time for that amount of fuel to be injected down? 50 microseconds...(always numbers)for a moment prendiad example map with the injection times of a jtd with edc15 and you'll see that for low pressures and iq the time of injection ? long for high pressures and high iq the time of injection, and much more a short time all the engines and common rail systems work in the same way....even if they are managed with electronic made in Eritrea....

Here it is a screenshot and edit it with the values.. and in fact ? as you say... for the same IQ with the increase of the pressure decrease? the opening time
tinj(rail,iq).jpg

[riccardo92]

But why? not ? linear? If you double the pressure half the time of opening. It is because of the opening times of the injectors?

[Backgroop]

If you do not ? a problem you send it on Skype... I sent you a message with the request.

I don ? got nothing.. try again

Here it is a screenshot and edit it with the values.. and in fact ? as you say... for the same IQ with the increase of the pressure decrease? the opening time
tinj(rail,iq).jpg

Great job at least cos? ? pi? clear the operation of the map..

[Danny]

Great guys! But from the original, really inietterebbe 65mm3?

[Fede78]

From what I see in the diagnosis injects a lot less... I seem to have seen values around 46/48 mm3

[Danny]

Umh, would be to understand the xk? behaves so?, and not inject gi? that quantity? of Diesel fuel.

[Fede78]

Umh, would be to understand the xk? behaves so?, and not inject gi? that quantity? of Diesel fuel.

Surely many limiters restrict this value... then c'? also a map that should restrict the mm3 as a function of the engine rpm.
But you have to enter the pi? air with a turbine pi? large and high blood pressure. Then, according to me, it makes sense to look to do to inject more? diesel
The map in question (the map 4x1 065574 in our files from 70cv)should limit the following values:
max_fuel_map.jpg

[leandro89]

If you do not ? a problem you send it on Skype... I sent you a message with the request.

what is the meaning of a request like that? it's not even worth to continue the discussion without seeing the file.

[Fede78]

To avoid the mistakes of other maps and try to have 1600 bar without any errors I have made a map virtually the original, only closing the egr and lim turbo moved, and then by changing:

-2-bit and limited to 1450 bar----- 605BA and 6748E
-limiter rail in the function p boost --- 674BE
-map rail (up to 1600 bar----- 675BE
-lim rail as a function of the temp of the fuel----- 67A06
-Minimum main quantity f(Prail)---- 689D6
-injection times with times of up to 1700 bar rail---- 68A46

Here's the files that I have not tested yet. Do you say that ? made according to the directions of backgroop?