change advances

[puntospeed1.3]

170 points are always 3.9 degrees.
the bkd 140cv has a 4000 rpm standard on all maps max injection 33? of life and 20? of inizioanticipo, is already in 13gradi after tdc. not ? as the 8valvole. I was wondering how many degrees after tdc you can get.. I also tried with 16 and 17? that came in addition to the 20? in addition to pms to low average. it was smoke, but if the series, once unlocked, the torque limiters, and all without touching the duration already iniettiamo over 13? we do not go away.

[asdone]

I thought that for the points you wish to microseconds in the map times, I ask for forgiveness!
For the low average is also good sfotare 10 degrees of post so much c'? pi? time for the combustion since the engine runs more? slowly.
C'? also to say that pi? c'? air and ir? the reaction ? fast so you need less advance, not for nothing, in fact, on engines with a turbine premium recommend less advance on those of the series!

[puntospeed1.3]

you ? true the turbo ? big indeed, the more you work at high pressure, and less advance is needed.
pero on the tdi, if you start first, enter a lot more, for example:
CASE 1 if you start at 15?btdc and hard 28? and I imesso a tot of diesel and I finished it in 13?after pms.
CASE 2 if I start at 17?before tdc, the hard always 28? I imesso more fuel and I lit the first mixture, and I finished at 11? after pms.
increasing I find more and more performance. now what? the limit? don't bend any connecting rod or crack a few piston?

[asdone]

No wait, if you have 28 degrees of injection which of them advances or delays always 28 degrees, not c'? pi? diesel, then maybe the combustion falls in the range pi? optimal, and then you have pi? power. However, although the comustione begins almost instantly before generating pressure, the reaction must reach the walls of the cylinder, in fact the pressure peak ? always after TDC, otherwise you would divide everything. For the how much to risk cross-reference here again: http://www.professionalchiptuning.ne...cipo-iniezione where ? described how to calculate how much time passes from the start of injection to the beginning of pressure, a lot depends on the size of the cylinder!

[puntospeed1.3]

are you always 28 degrees, but if I go first, and hard always to 28, I'll be entering more.
on the common rail ? different.

[checchitotiralaleva]

L?advance ? a lever is very powerful in the calibration phase, we optimize the tour along with the EGR, boost and injection pressure.
The logic of the optimization of the combustion in stationary at the moment (for what I know directly) are: minimize specific fuel consumption, hitting a certain target NOx (function of?efficiency?ATS use) with a certain limit of fumosit?.
With regard to the achievement of the target for NOx the main lever ? l?EGR, followed soon after from?advance.
L?advance injection ? instead, the main lever that we have on the parameter of the specific consumption (CONSUMPTION NOW/KW). But also one of the parameters pi? critical to keep sott?eye with regard to the pressure within the cylinder, followed by the rail pressure.
Increase l?advance of injection, significantly improves the specific fuel consumption (introduce the same mg/hub of fuel, but I get pi? kW), to move the center of gravity of the combustion towards the left (towards TDC), the local temperature of combustion increases, the temperature of the exhaust gas decreases, so? as the fumosit?, but it causes an increase in emissions of NOx and the pressure within the cylinder (structural risk).
From?the other side to increase only the quantity? the maximum injected increases the torque that the motor can? generate but does not improve the specific fuel consumption, move the center of gravity of combustion to the right (towards SME), heats the exhaust gas and is smoking more.
To conclude, I would say that the change of the advances depends a lot from?entity? of the change on the quantity? maximum introduced. In any case, limit it to the areas of the plan that is quoted relative to high rpm and high loads if and only if the diesel ? been significantly increased.
Speaking generally, the calibration current tend to always use less EGR for?reduction of NOx , using jointly all?advance (rather low compared to the past). The motors that we develop to survive at times with the pressures within the cylinder to be increased by 10% compared to the maximum pressure that the reliefs in normal operation. Given that we start with down payments low enough, we must insist a lot with l?advance to increase the pressure within the cylinder up to the desired target.
These considerations to say that, even without the benefit of instrumentation to measure the pressure within the cylinder, and without knowing what the limit of your engine, I don't think there are no problems to increase 1-1.5? l?advance.
I would be very pi? worried from?the increase in bad calls of the diesel, the risk to cook the turbine and the DOC?

[asdone]

puntospeed1.3: ? true ? different, but if you tell me that the injection lasts 28 degrees, those are, that changes the offset (ahead) for that matter? if you can tell me, I'm all ears and willing to learn!

checchitotiralaleva: I have already? appreciate your posts in other threads, I have seen many files with advances even more? 3 degrees, with the folks who claim that we run from life and has never split anything, in relation to what you said I would have to assume that around the map there are limiters in advance to prevent the increase in reckless the beginning of the injection? Or simply there were other limiters IQ, which prevented the effective application of that advance?

[puntospeed1.3]

checchitotiralaleva: thanks to the intervention is very constructive.


[QUOTE=asdone;85505]puntospeed1.3: ? true ? different, but if you tell me that the injection lasts 28 degrees, those are, that changes the offset (ahead) for that matter? if you can tell me, I'm all ears and willing to learn!
I don't understand.. what do you want to know?

[angelolsp]

there are lim in advance....

[checchitotiralaleva]

Thanks Asdone,
there are limiters in advance, in my case - InjCrv_phiMI1Max1EOM0_MAP, ? a map, but the values are cleared... behaves like a curve in function of the rpm..
Inside the base map of the advance you move always in function of rpm and introduction, if you increase the introduction you are going to work on sundry advances. The base map should be calibrated in such a way as to be always below the limit of advance, even in areas beyond the introduction limit.

The management of advances ? very detailed:
- I have little experience why? I never used the first person, but there are also fixes to the payments for the transitional...
- Maps parallel to the advances in the cold;
- Maps that are dedicated to the management of advances during cranking (starter)