Map VGT [variable geometry control]

[sighline]

Someone I know to explain well why the latter should never be touched redoing the map ?
By changing the values of VGT in theory, you could get more pressure at all speeds ..

2nd question : in 3d [ecm] the value that is reported in percentage would be the opening or closing of the palette ?

the maximum value of % 74,4 (then it is open or closed, 74.4% ? ) while the minimum is 46,1 .. Why not come to the 100's and 0's ?

Thanks !

[SandroMarciano]

The topic ? very large, let's say that normally best to leave them original, why? the pressure can? however, increase due to the increase in the diesel fuel, and in many cases instead ? need to decrementarle to reduce the peak higher that you would have after making the change. Pi? the percentage will decrease, and more? the gas flow without increase of the pressure in the intake.
Another matter: do not you get 100% or 0 why? non ce n'? reason in the sense that you can? to obtain the required pressure without reaching the maximum of the vgt and not c'? need to get to 0 to bring down the pressure to high.

[megamind]

Sorry, but if you increase the grid increases the percentage of opening of the blades? Usually low ? this was closed to high opens.

[sighline]

It is just what it says sandro.. if you increase % our that the vanes are closed ( abassano) and then increases the pressure on the suction
and vice versa.. lower the%, the more you open.. and, consequently, more air goes without operating the impellers.. ( qnd relatively low pressure, if high rpm)

[SandroMarciano]

It is just what it says sandro.. if you increase % our that the vanes are closed ( abassano) and then increases the pressure on the suction
and vice versa.. lower the%, the more you open.. and, consequently, more air goes without operating the impellers.. ( qnd relatively low pressure, if high rpm)
exact, precise? that the adjustment of the vanes does not work as one might mistakenly think closing part of the duct, bens? by varying THE DIRECTION OF the VELOCITY? in order to take advantage of pi? kinetic energy to move the impeller discharge.

[munro]

Someone I know to explain well why the latter should never be touched redoing the map ?
By changing the values of VGT in theory, you could get more pressure at all speeds ..
do not change because then you dovrebber? also change the PID controls that oversee the operation of the system

2nd question : in 3d [ecm] the value that is reported in percentage would be the opening or closing of the palette ?
good question...in the vw to es for high rpm and high iq in the map you have high % duty cycle...so, it depends a p? as the constructor to set the system

the maximum value of % 74,4 (then it is open or closed, 74.4% ? ) while the minimum is 46,1 .. Why not come to the 100's and 0's ?
being that in most cases, the solenoids of the vgt working in Pwm, and then the duty-cycle send 100% of duty cycle to the solenoid means to send 12 volts...how much do you think that can last a n75 in these conditions??the 0 is not used because, however, the turbine also to the minimum or the dates of the condition must be ready to immediately give the pressure...

Thanks !
attention on some of the ecu, the value read in the Z-axis has to be converted...so do not always correspond to the real duty cycle n75...

[cicciogsr]

exact, precise? that the adjustment of the vanes does not work as one might mistakenly think closing part of the duct, bens? by varying THE DIRECTION OF the VELOCITY? in order to take advantage of pi? kinetic energy to move the impeller discharge.

the cursed triangle of the speed?..

[SandroMarciano]

the cursed triangle of the speed?..

[tidus1985]

rianimo the topic with the hope to understand more about what they do and how they change the P. I. D. management vgt, in the sense that I know what to do but I don't know what causes the value in the map, if the steo correction on the basis of what

[puntospeed1.3]

very interested on the pid, and what it means to turn them off (as already said in many other threads). that put them at zero throughout the curve, or what.

[GPoint]

If I had of pressure peaks, in this case, I could use the management VGT to reduce them, without necessarily having to lower the boost pressure? But in the case of a modification ? obtained in terms of pressure as it would result in the vaiazione of a certain percentage or ? always better to proceed in small steps, and test the change on the road?

[biela]

After having climbed the pressure of the turbo, test the car on the road.
Record the data and edit the VGT as ? diverted the pressure.
You can? also affecting the increase in IQ.

Greetings

[ugoboss]

on some I tried to give less pressure than usual to the turbo and give a 2% on the vgt and the machine, and much more reactive.

[SandroMarciano]

[QUOTE=GPoint;77529]If I had of pressure peaks, in this case, I could use the management VGT to reduce them, without necessarily having to lower the boost pressure? But in the case of a modification ? obtained in terms of pressure as it would result in the vaiazione of a certain percentage or ? always better to proceed in small steps, and test the change on the street/QUOTE]

Once used, the conversion factor should be noted that the data in the map are expressed as a percentage, that ? the closing of the vanes, to reduce the peak starts to drop 1-3 percentage points from the area where inject ir? diesel, if you misjudge it, the machine will be? slow to take the turns, but if you find the right balance you will not be pi? the elastic effect, which is when the peak ? very high.

[GPoint]

Once used, the conversion factor should be noted that the data in the map are expressed as a percentage, that ? the closing of the vanes, to reduce the peak starts to drop 1-3 percentage points from the area where inject ir? diesel, if you misjudge it, the machine will be? slow to take the turns, but if you find the right balance you will not be pi? the elastic effect, which is when the peak ? very high.

Hello SandroMarciano, following some discussion, I tried to change the VGT gi? by a few days. Basically my problem was that I had peaks at 1.7 bar when MES I read about 80 mm3 of diesel injected. I realized that the pressure values are increased when I raised the diesel. In the end I worked cos?, given that in the table refers to the vgt I rpm x mm3 the last 2 values of the scale were 65 and 70 mm3 I mod the last 2 breakpoint in the 70's and 80's and I have updated the values inside the table. I redid a p? test with MES and the maximum peak comes in at about 1.6 bar and normally I see values between 1,5\1,55 bar. I don't know if I have successfully changed or if ? was just luck.
However, the changes I have tried to make are at the following link: Link (https://www.professionalchiptuning.net/showthread.php?5195-Parere-mappa-Alfa-Gt-MJET/page8)

[fabio1207]

Thanks guys I think I learned something about vgt:)