EDC16 N75 CALIBRATION FOR 1756 VK ON 1.9 TDI PD

[Labed2007]

Thanks a lot Labed2007 but dpf is already off this is a single switch

test this and make a log.
Dont forget star and rep

[vwstuff]

Sorry I work only with my file step by step on N75 optimization

[Labed2007]

Sorry I work only with my file step by step on N75 optimization

I don't understand....

[jurebv]

read my previous post

from 1500-1700 increase n75 a bit
from 3800-4800 decrease n75 a bit

[vwstuff]

+1
Otherwise , Do i need to work only on two mean N75 maps : 19118A and 1EA00E ????

[Labed2007]

+1
Otherwise , Do i need to work only on two mean N75 maps : 19118A and 1EA00E ????

Yes, n75 have no.1 map for manual transmission and no.2 map for automatic transmission.

[vwstuff]

Let me know what do you think regarding my boost curve !!
The main problem is my max egt ... and my boost is still at 2750 mbars !!
What is the best way : ingrease boost to 2850 mbars to archive both my egt ( below 800 °C ) and afr goal ( 1.2-1.3 ) or lower durations ??
Is 2850 mbars not to much for gtb1756 vk efficiency and reliability ??

[vwstuff]

I attached my last file work in process......

[DiegoStud]

The reversions in the duty cycle direction show your N75 have a little work especially between 2200 and 2750rpm just to stabilise the boost better. In doing so it may reduce the osccilations that occur later.
Be careful of increasing demand too much too early. Looking fine otherwise.

Yes increasing lambda would reduce EGTs but neither do I think 1.3 lambda is a realistic target without reaching PCP limits.
Assuming fairly low pressure drop through your intake system, 2850mbar from 3500-4750rpm would correspond to around 170000rpm and mean a compressor tip speed of 498m/s. ~76% efficiency. The compressor would be happy with that.
However the issues are on the turbine side as you are now getting to the limit of your injectors. EOI currently around 10-12ATDC? This causes high EGT.

Advancing SOI would improve but at these levels of boost and IQ there isn't much room to maneuvre before hitting peak pressure limits- in otherwords reduce IQ.

Will have a proper look at the file later.

[vwstuff]

Again thanks a lot for your advices; will test at 2850 Mbars from 3500 to 4750 rpm to see the afr result and post

[DiegoStud]

Ok here goes:-

Your car is driving on nothing resembling your torque limiter. You are being limited by a number of issues. Which is a good thing as if it wasn't you would be running aroung 13.5-14:1.

Duration maps are limiting to 75mg. You could maybe get a little more out.
Make some calculations- how much IQ are you requesting? Therefore how much air do you need to burn efficiently? Therefore how much boost do you need? Is this level of boost realistic? Rinse and repeat.

In view of the above the following issues are practically moot:
Nm to IQ is limiting requested torque to a max of 444NM.
Smoke MAP is limiting from 3000rpm onwards.

[vwstuff]

Will correct torque and all of these issues...
I notice my air flow fall down at 444 what is the problem ??
Also according to vcds my max IQ is 70 mg : another limiter ??

[vwstuff]

Torque limiter modified Is that right now ?

[DiegoStud]

Not had a proper look but check your diagnostic limiters. I doubt MAF is reading 1275 exactly as well.

Torque Limiter- It's almost by definition that full load should be determined by Torque Limiter. If anything else is limiting you, then you no longer have exact control and soon lose idea of what is going on.

As I've already said, requesting anything above 75mg is a waste of time at this point as you are limited by duration maps.

I'll ignore the values below 2250 as you will be limited by smoke limiter (this is normal especially with running larger turbo). Just as well, as with those values you would be running around 13:1.
Here's an estimate of AFR for you. I've taken the liberty of plotting values that would equate to 17:1 or the 1.2 lamdba you wish to run.
1756.jpg

I'll let you decide if it's right or not

[vwstuff]

My curves are nice ....
Regarding durations you inject up to 81.4@2000 rpm , is the best way to extropolate all my duration maps values and axis up to 80 mg for Maps 0 to 3 ?
I'm in the dark !!