EDC16 REMOVING MAF DIAG LIMIT AT 1275

[vwstuff]

No help diego ???

[DiegoStud]

Too busy to give as complete an answer as I would wish, but here are the salient points:
Smoke/Lambda issues- Smoke map was a CR170 not PD- common rail can run richer than PD for a given smoke limit and 16V better breathing. You can have as big a gap as you wish, values in between are interpolated.
If you want to run leaner, then reduce the figures.
At the same time, 1.3 lambda makes no sense when to spool a 1756- this is the whole reason why smoke limits are a map and not a single figure, or a flat lined map such as you have initially made. Richer lambda will increase pre-turbine exhaust enthalpy, thereby work that can be performed on the turbine, meaning target boost setpoint can be acheived quicker and then once spooled lambda can be leaned out again. Think more 1.1-1.15 lambda at lower IQ and RPM to initially spool. Worth noting on your log boost only meets specified ~3100rpm. Boost following the green line on the graph as shown would be less aggressive and yet still meet specified by ~2600rpm.
Boost log.jpg

N75 issues- are you changing the right values? Look at IQ in your log and compare to your N75 map. ~60mg? 33-21%? PID is doing a good job keeping you up above 40%. Why does your N75 map reduce as IQ reduces?

Nice to hear you've got Lambda limitation functioning- well done.

[vwstuff]

Thank for your feedback, help and time !!!
I will try to correct my boost curve as much as possible according to you green line sugestion , for this purpose I focus only on the 2 main maps : 19118A and 1EC564 maybe i'm wrong ?
The only raison I whish to increase boost at top end is for lower egt.
In the range of 1.1-1.15 I'm still over 800 °C... my bad
750 °C will be fine i guess
Unfortunatly, 02 sensor full load don't see to working properly .
I think another trick is necessary to put it on.
Maybe smoke map MAP need to be blanked just an hypothesis...who know ?!

[Meat-Head]

Just to add to this, can you add somekind of feeder tube into that exhaust so when your over 666 deg c
you can drop into another bath mounted on rear bumper some freshly smelted aluminium ingots.

then every 20 miles sell the ingots at every fuel station for diesel

[vwstuff]

I read the text below on vw tdi forum what do you think about it Diego ?
Maybe full load LSU is in close loop with MAF ?
In other world LSU full load mode will work only in edc 16 MAF mod ?


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One more function. Full-load Smoke Limitation. This is the oh-so familiar smoke map which is implemented with the MAF on the older engines. (And actually, I assume that the MAF is still used in EDC16 in a inner-outer loop setup similar to the EGR control). Basically, the A/F ratio is directly related to smoke number (how much smoke the engine puts out). The lower the A/F ratio, the higher the smoke number. There's an internal limit in the ECU as to how much smoke the engine can put out... and if the measured A/F ratio drops below the stored A/F ratio related to that smoke limit, the ECU will reduce fueling.

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[DiegoStud]

I read the text below on vw tdi forum what do you think about it Diego ?
Maybe full load LSU is in close loop with MAF ?
In other world LSU full load mode will work only in edc 16 MAF mod ?

Yes it is in closed loop with MAF- MAF determines what the target lambda should be (outer loop as he calls it) as the lambda maps use an airflow axis based on mAirPerCyl from MAF, and LSU provides feedback to account for any deviation therefore closing the loop. There is no need to blank any maps, switches will correctly select what it will use.

Regardless, your MAF readings bear no resemblance to what your engine is breathing thus rendering all the above defunct.
As I see it the reason you are trying control lambda is really to control EGT- instead of trying to set up an extremely diffcult lambda control, why not deal with EGT directly and use the EGT limiters?

[vwstuff]

Do you mean to move the max stock egt limiter over 800 °C
This is not really safe ???

[DiegoStud]

Raising limiters wouldn't keep it under control now would it?
What I'm saying is if you are hitting the EGT limiter so quickly you have a choice to make: increase boost, reduce fuel in torque limiter or let the EGT limiter reduce it for you.
Smoke limitation in whatever form, be it MAF or MAP, is for controlling minimum acceptable lambda under transient conditions- ie short bursts.
If you want to keep aluminium ingot consumption under control you can't afford to be driving on your smoke limiter- it isn't designed to do so.

[Meat-Head]

If you want to keep aluminium ingot consumption under control

Excuse my ignorance of being just a leecher, do you not mean “aluminium ingot PRODUCTION” rather than
consumstion

great post there

[vwstuff]

Nothing is under control ...
Now I better understand the way edc16 work thanks to Diego !!
A this time, I stop the remap process to work on hardware ( intercooling , intake manifold, turbo efficiency ) .
My goal is to lower egt !!!
So I stop momently aluminium ingot production