change advances

[jovandj]

On this we agree

[ducati83]

I read the whole discussion and would like to understand one thing: because it speaks to the fact that the injection in a diesel engine at the maximum should take no more? 10? DPMS....this is true for the increase in performance?let me explain:I had the chance? to change advances, time pressures, etc...I could hypothetically burn 70mm3 is doing, to inject up to 5?DPMS or up to 8?DPMS redoing the whole map from scratch....but doing such a thing would have performance increases?

[asdone]

Why? to redo the entire map? Just adjust at 70 mm3? For the maximum degree of the end of injection is this ? relative to the number of turns from the engine, the turbo pressure etc..
Everything that relates to injection and advance me ? was explained very well by the user sergiot here: http://www.professionalchiptuning.ne...cipo-iniezione

In general, the 8 degrees of EOI at 2000 rpm are good, 8 degrees at 4500 rpm would probably make only the smoke! this, at least for the tests that I have had on my car

[ducati83]

sorry to recap: I calculate the total duration of the cycle, then we subtract the down payment and I have how many degrees after TDC ends the injection right?

[asdone]

END of INJECTION (deg) = (INJECTION TIME) / (1 / (Rpm / 60)) * 360 - ADVANCE

[ducati83]

ok, to increase or decrease the end of injection can only intervene on the injection time..or you work better by tapping the advances?

[asdone]

You work on both, the advance ? the negative offset with respect to the PMS, and the duration is translated into degrees, knowing the rpm. (The formula does not take into account the acceleration of the shaft, but did not ? cos? relevant, I think).
To reduce the duration of fuel injection without decreasing the amount? you can raise the pressure within the limits of the components

[ducati83]

then I take a look at the map of the injection times of my 159 to 80mm3 have the time of injection 3000 us for 121bar pressure.
now the end of injection would be: 3000/(1/(250/60)*360 - 1.99=3000/ 1/1498.1=3000/0.0006=5000000 then I play 5? DPMS????

[asdone]

Yes, but the time ? in the US... 3000 = 0.003
And then, to me is 2.625 degrees DPMS about

[ducati83]

I'm sorry that the calculations you have done them you can post....?