Oh, now I see !
Software from 2.0 8v 110HP engines has a nice, fat 16X16 MAP smoke limiter, which has been replaced with the 2x2 one on 2.2hdi engines. You cannot get a good smoke map with just 4 values, so I guess this mod should not be done on street cars.
The MAF is big on those engines anyway so it should be good for over 200HP.

wld wrote:Oh, now I see !
Software from 2.0 8v 110HP engines has a nice, fat 16X16 MAP smoke limiter, which has been replaced with the 2x2 one on 2.2hdi engines. You cannot get a good smoke map with just 4 values, so I guess this mod should not be done on street cars.
The MAF is big on those engines anyway so it should be good for over 200HP.

Maybe hard to believe but 2 x 2 is enough. Because if you take for Example Mercedes Benz diesel cars are mostly MAP based. And if you open for example 5 different bins from 5 different cars/engines, you will see that MAP smoke limiter as it is is pretty linear.
You can decide how your axis for rpm will start and end and by that you can decide y=kx+n what will be your k and how steep that line will be until it stops at the higher rev axis value, and at the higher rpm value you stop where you wish your AFR will be good enough not to smoke, but you calculate that based on volumetric efficiency of engine and other factors.
I hope i explained well. By that strategy you can have nice MAP based car on the road with pretty good efficiency.
Mine 2.2 HDI took average 6.5L-7.4/100km combined normal ride.

So you put range of rev :revX revY where revX < revY close enough but that revY stops from point where you wish full power...

Sample picture attached.

ecuedit.
pressure on the axis of the absolute - then a lot of smoke, or the relative unit?

hi there,
the sample of 2x2 map is from ECU that has mm3/stroke not mg/stroke (approx mm3/stroke * 0,845 = mg/stroke) - calculation and sample is just for orientation, it is pressure of boost without atmo pressure. Relative.

So X axis - relative pressure, Y axis RPM, Values in mm3/stroke. Actual sample was running at lambda 1,02 at full boost and around 1.1 around 2000rpm. Note that output measurements at exhaust are in most of time little bit different than desired.

you probably mistaken for 15C7 X axis in absolute pressure units, I checked on his Fiat. And at 2.1 bar. 70mm3.

Deman wrote:you probably mistaken for 15C7 X axis in absolute pressure units, I checked on his Fiat. And at 2.1 bar. 70mm3.

You are probably talking about what you see in damos, not what you see on picture i posted...i suppose...

i will explain: if you look for sample rail pressure map you actualy have values in damos in hPa, but do you work with hPa which has factor 100?...me not, i put factor 0,1 and i work in Bars...

ecuedit wrote:... it is pressure of boost without atmo pressure. Relative.

:) i represented you actual boost in map = offset= -1,
it is way you set up your map = without offset you will have 2.1, with offset 1.1...

no mistakes are allowed...can you imagine ammount of smoke if that would be true? ;)
I feel little bit offended :lol:

I understood you. But so you mislead. ;) Since there really is an axis in absolute ml.bar. And you recalculate relative atmospheric.

Deman wrote:I understood you. But so you mislead. ;) Since there really is an axis in absolute ml.bar. And you recalculate relative atmospheric.

I do not look at that way ;) (i see things little bit different) it is pretty strait forward explained with text and pictures also with answer on your question what do i represent on posted picture -> answer was relative boost : since that map is set up, it is visible that factors and offsets are entered in the map - it is just the view of the map. You could also put factor for PSI if it is better understandable for the person who operate with the map.

It is a basics that has no weight, units, factors, offsets, maps, mappaks, damoses are just a basic tools and documentation to help you to understand ECU logic and further more or less complex calculations and modifications.

Jumping thru units, views, imaginable factors, offsets is a strategy to help with work.

I know what you mean but when working with almost all possible ECU producers on market you develop pretty handy things to unify the views of the map.
I never work with absolute pressure map view, i always make view of relative - which person can feel - actual boost.

For sample, you check if it is absolute or relative and you always work the way you see relative. There are ecus that have for sample 32bit X axis, 16bit values, 16bit Y axis in one single map, and possibly inversed map with non logic factors... so when setting up map to see values that are understandable i would set it up always in relative pressure instead of absolute, BARs instead of HPA, for calculating AFR always in mg instead of mm3 when airflow is in mg,

I think it is enough to show 0bar -> 1.7bar and to say it is relative numbers represented in map view.

Tested MAF off yesterday. Working excellent. If the torque limiter is done well, then there is no visible smoke with max iq just under 90mm3.
Thanks!

wld wrote:Tested MAF off yesterday. Working excellent. If the torque limiter is done well, then there is no visible smoke with max iq just under 90mm3.
Thanks!

;)