Map Alfa 147 1.9 JTDm 120 hp

[giuseppe1374]

gi? 90mm3 for that machine are sufficient if we are talking about changing the stock, otherwise, if you want to go beyond you have to at least replace the injectors, and intercooler, and the turbine, the turbo then down for if not that turbine will last from christmas to st. stephen,using a maximum pressure of 1.4, then I wanted to ask travis how much diesel fuel does inject his car and the injectors as they are combined-why? an injector has its calibration and I don't think that can? tolerate the 120mm3, but this ? my opinion I don't want to offend the work of no one.

[SandroMarciano]

gi? 90mm3 for that machine are sufficient if we are talking about changing the stock, otherwise, if you want to go beyond you have to at least replace the injectors, and intercooler, and the turbine, the turbo then down for if not that turbine will last from christmas to st. stephen,using a maximum pressure of 1.4, then I wanted to ask travis how much diesel fuel does inject his car and the injectors as they are combined-why? an injector has its calibration and I don't think that can? tolerate the 120mm3, but this ? my opinion I don't want to offend the work of no one.

I agree, unfortunately for? the only way to increase the injectors of the 147 mjet 120cv (as far as I know) ? put the nozzles of the injectors of the 159 2.4 mjet, at a cost, however, prohibitive. I have a jtd, I have worked with mjet, but the things more? extreme I've done on mine, and I know that I need to mount the injectors, and upgraded (I thought of those of the 147 in fact), however for now around with 1500bar, but I turned also to the pressures pi? high and times *1400bar in the order of 1300us, not ? nice as a change, I know), but the machine works with those injectors yet!

[tidus1985]

I knew that the 1749v up to 1.5 bar holds, and 1.6 bar for the 1749mv of 150 hp, I is 1.3/1.4 already in stock

[tidus1985]

oh, I forgot, having downpipe the heated less, I'm sure that holds 1.5 bar, so, for the less still I don't even have the game on the post, I have mapped to 70000km I 85000 and no problem, turbine, which, for some period piccava to 1.7 bar for problems to the valve-pierburg

[SandroMarciano]

GT1749V-778445-0001-compmap.jpg
See for yourself...

[tidus1985]

I'm sorry, I don't ? still allowed to open attachments, if you can direct me to the image I would be grateful

[SandroMarciano]

I'm sorry, I had not made the case, search on ****** "compressor map gt1749v" and among the images you will find the chart that shows the efficiency of this turbine to vary the boost pressure and air flow rate.

[tidus1985]

seen, unfortunately I can not read the meaning of the diagram because I don't know what it's worth, the location of the ducts of the 147 you may tradurmelo in words more simplified?

[SandroMarciano]

not ? cos? simple... the flow is not ? a simple air flow, but ? a small, dimensionless parameter that depends on the diameter of the duct, the temperature of the air, and if I remember correctly density. The one you've shown ? the curve of operation of the compressor, to know how to work you'd need to intersecarci also the curve of operation of the turbine.
The problem though ? the curve pi? to the left you find ? a "surge line", and to the left of this c'? the area of pumping, that is the one you should absolutely avoid. The area of pumping ? the pi? dangerous for the turbo, why? in those areas, we check that the boundary layer occupies the whole of the duct, creating a cap, so the pressure tends asymptotically to the maximum value, but the impeller increases the number of turns anyway...

In the graph relative to the 1749v, you can see that 1.5 bar "gage pressure" are practically next to the surge line...

[tidus1985]

Ok thanks, in the meantime, I made a correction to the map, 1.4 bar maximum but after 2800 rpm salt xomuqnue almost 1.5