Map Alfa 147 1.9 JTDm 120 hp

[tidus1985]

then, I calculated for the whole scale used in the opening times of delos the needle, increases as the pressure decreases, this is because unlike the old injector, the injector common rqail should not win the pressure from the rail, but is facilitated by it, when it comes to the pressure on the injector is distributed in 2 rooms, one on top of the pin and one below, the 2 pressures cancel out, and the needle remains in the balance closed by the mere force of the spring, when we give the command to the solenoid of the upper part, where c'? the rail pressure is emptied and the lower part, where c'? always the rail pressure with the same pressure controls the opening of the injector, then + pressure = + fast opening

here is the jpg attachment with the scale of the rebuilt up to 100mm3 from 10mm3, many of the values reported 3000 at low presisone are not right, I on my map I have them all ricorretti

therefore, to calculate the apertuda to 100mm3 the formula ? ((T10-Ti)x10)+Ti, where T10 ? the opening time 10mm3, and You ? the opening time of the needle to the rail pressure choice

then by the classical proportion 82mm3+25% in reality, we increased the injection times of 31% and we would have injected a quantity of 106mm3 instead of 100, then a 6% and more, of course not, you die, but if you want to place a map to ok, I don't think it is an error to negligible

here's the table, it is for the injectors 120 and 150 bhp 1.9 jtd jtdm, 1.6, and 2.0 have pulverizers different then the rule does not apply

[Gia]

Thanks tidus. Very helpful. Can I ask you if ? the result of your studies, I've got some source?

[tidus1985]

the fruit of my studies, increasing by 25% under the advice of a user on the forum, I realized that the map time is not followed a linear increments, just watch it in 2d to see that you are not ? a straight line but a curve, you want that the values are not step by step the same, but also trying to mettereli on step same the value does not return, try with exel to insert the values into oprdone of 10mm3 and make a chart, I did, and then I squeezed, then reading a message from another user a little more on that in speaking of the opening time of the injector for me ? coupling a bullet in the head: not ? in the map ? cosniderato also the time of the opening of the needle? they must have done to have a map in less to manage, and then with my felicta I found the values for which removing them from the time all of the proportions of the maps tronano, made with the exel sheet to mo dif toto following the formula that you created after the various tests for each pressure, having consciousness after the first 4 steps of the rail that increase the pressure I had to try a value lower than the previous one, and so I created this sheet that I am glad to share with you

[SandroMarciano]

attention, doesn't it ? only the result of the delay of the opening of the needle, but essentially to those pressures, the pressure losses increase exponentially.

[tidus1985]

attention, doesn't it ? only the result of the delay of the opening of the needle, but essentially to those pressures, the pressure losses increase exponentially.

Speak to the low pressure because of rising pressure, the value decreases

[SandroMarciano]

yes, the opening of the needle should decrease with the increase of the presisoni, instead, to the speech of the opening time of the injectors ? pi? complicated, since the flow rate should increase linearly with the pressure, instead of the load losses increase exponentially, for which we do not have a straight line to identify the curve of the opening time, but a curve with exponential profile.
Even if hypothetically we were to go beyond certain limit values with the pressure we would have that the boundary layer would develop for a large part of the surface of injection of the injector, and this creates the phenomena molot dangerous. The VAG that run with a pressure of 2000bar break very often the injection pump, and I think that the thing is due precisely to this phenomenon, for which I think that is not the case of fasciarci the head with the accounts useless because anyway ? an experimental measurement at the base of the map of the times, to us, impossible to realize.

[tidus1985]

Indeed, my calculation was directed to the increase of the flow rate as a function of time of aperturra and not in function of the rail pressure as you say requires other knowledge of the physical

[SandroMarciano]

no, knowledge is not enough, you also need specific equipment for the detection of the experimental data.
Furthermore, the flow does not ? linear even fixed a rail pressure, in fact, the load losses are a given variable here.

[tidus1985]

So I have to presumerr that also the map time fiat is simplified without counting these constants piiche with the formula applied to return all the values, right sandro? Tolerate an error rate acceptable

[SandroMarciano]

? strange the cpsa, why? on these injectors seem to work roughly, but much better than my system, instead of on the jtd 115, for example, presents data completely inconsistent!