Advance injection 1.3 Mjt - MJD8 vs MJD6

[Fede78]

It's a bit that I was studying the maps of the advance of the 1.3 multijet and compared to that of a MJD8 that comes from a project that OLS should come from a damos... and then conftrontavo with that of my Point 70CV then MJD6.
For? in tabular cos? as from the file OLS for me not to ? correct ilverso of reading, in fact, the degrees of advance will increase with the increase of the rpm and not the contrary.
SOI1.jpg

But, as I said, for me, has to be read in this way:
SOI2.jpg

In MJD8 the map ? 8-bit with a conversion factor of 0.3 (at least from what c'? in the file OLS...) while in the MJD6 the map ? to 16 bits conversion factor 0,015625 (from what I've found on the net)

The 70 HP then works with advances more perhaps due to the lower pressure of the rail, and then the resulting time of injection pi? high.

Now wanting to optimize the advance on my engine, 70 HP that calculations must be made to compensate for the increase of the injection timing? So do not go in afterburner but even in precom.?

These that I have analyzed should be maps of the main inj.... as we all know, the multijet has several injections... pre and post...
To do a good job, you should also change the maps of the pilot injection and pre-injection?
The post injections that would serve to increase the temperature of the catalyst or DPF if this can be deleted (since I know of no use at all for the performance)?

I know it's not ? an easy subject but I hope someone can help me and help anyone who has these questions.
Thanks

[hgtferma]

It's a bit that I was studying the maps of the advance of the 1.3 multijet and compared to that of a MJD8 that comes from a project that OLS should come from a damos... and then conftrontavo with that of my Point 70CV then MJD6.
For? in tabular cos? as from the file OLS for me not to ? correct ilverso of reading, in fact, the degrees of advance will increase with the increase of the rpm and not the contrary.
SOI1.jpg

But, as I said, for me, has to be read in this way:
SOI2.jpg

In MJD8 the map ? 8-bit with a conversion factor of 0.3 (at least from what c'? in the file OLS...) while in the MJD6 the map ? to 16 bits conversion factor 0,015625 (from what I've found on the net)

The 70 HP then works with advances more perhaps due to the lower pressure of the rail, and then the resulting time of injection pi? high.

Now wanting to optimize the advance on my engine, 70 HP that calculations must be made to compensate for the increase of the injection timing? So do not go in afterburner but even in precom.?

These that I have analyzed should be maps of the main inj.... as we all know, the multijet has several injections... pre and post...
To do a good job, you should also change the maps of the pilot injection and pre-injection?
The post injections that would serve to increase the temperature of the catalyst or DPF if this can be deleted (since I know of no use at all for the performance)?

I know it's not ? an easy subject but I hope someone can help me and help anyone who has these questions.
Thanks

hi faith, can I ask you why? you need this info??if you make a map with push ok but otherwise the 1.3 for a map to soft and slowly increasing too much the time of injection should be already more than good...

it is, however, the advance has to be seen to the contrary

[Fede78]

Hello, the idea was to maximise my Point 1.3 70CV... now I am undecided to mount the BV35 gi? modified with geometry that works with a wastegate... or put on the GTB1549V derivation of the 2.0 Multijet 170 CV, even if, perhaps, the solution pi? sensible would be the middle of the road... or the GTB1446V of the 1.6 Multijet
Now, following some advice I am limited to anticipate of 1.5 degrees with respect to the original.

[munro]

if I remember well, and was told somewhere else that does not anticipate a diesel cazzum....
worth serious problems...
to act with knowledge of the facts you need to calculate how many degrees does the main injection from microseconds to degrees of motor rotation, and by them out where we can? push with the advance...
we put the case that your injection to 4000 rpm is 890us that have been converted with a formula that now I don't have on hand correspond to a duration of 25? of the rotation, if at 4000 rpm with the iq that you are injecting the ecu adopts an advance of 20? (random numbers) you know that your injection ends 5? after the pms....
time and belief in general that you should not inject more than 10? after the pms....
I sincerely for the few maps that I adopted another strategy....

[Fede78]

It is, in fact, I just wondering for advice on how to anticipate correctly. Unfortunately ? a topic that perhaps few know in detail.
Cos? as I have done, I know that's not good.

[munro]

I think I told you how to do it anyway....
search for the formula and made the calculations..
already by doing so you will realize for yourself that the main injections are not exceeding never tot of degrees duration...

[Fede78]

Ok, prover? to understand how to do the calculations.
Thanks!

[Fede78]

Then from what I understand I don't have to have injections over 10? after the pms but as the beginning of the injection?
Somewhere I read as the beginning of the injection values of 20? before tdc...

In the original map of my Point 70 HP I have a maximum advance of 29 degrees (IQ greater than 26 mg/stk and 4688 rpm)... Possible?
If it were so? I could inject diesel to 39 degrees (29 btdc + 10 after tdc) without and then go in afterburner?

[angelus.d87]

but the advances that address have?

[munro]

Then from what I understand I don't have to have injections over 10? after the pms but as the beginning of the injection?
Somewhere I read as the beginning of the injection values of 20? before tdc...

In the original map of my Point 70 HP I have a maximum advance of 29 degrees (IQ greater than 26 mg/stk and 4688 rpm)... Possible?
If it were so? I could inject diesel to 39 degrees (29 btdc + 10 after tdc) without and then go in afterburner?

not ? just so....
in your case you know that your iq(26mg) at 4688 rpm you an advance of 29?.....or? you know when to start the main injection....but as I hinted before, you know how many degrees it ends??
10? they are a non-written rule that for? pu? vary from engine ? engine especially as we use the v? to set the "hardware"...
if you know how many degrees of duration angle match your injection times with the advances in hand, you can already? get an idea of how the manufacturer decided to go with the duration of injection in addition to pms.....
remember that when you are searching for high power with degrees quantity? diesel fuel is of primary importance to monitor the egt....