This is only way that I can think of how to extrapolate both SOI maps to 75mm3.
Should this be ok?

what is your eoi right now for 50 to 75mm3?

mladenke wrote:what is your eoi right now for 50 to 75mm3?

Well....currently in car is remap v13.3; logs from yesterday was from that remap, and in my calculations, EOI for that remap is this:

Last column for 75mm3 is calculated by SOI at 55mm3, because in SOI map without pilot this is a last column.

For SOI maps that I posted last, where I changed axes and allow 75mm3 in both maps...EOI should be this:


This EOI at 75mm3 and < 1750rpm is not important because it is never used (TL limiter).

mladenke wrote:sike, yes i see your airflow drop. do a test for maf, all off that in your last picture and air quantity volts. maf volt's must be from around 2.5v for 550mg/i to around 4.6v. for 1100mg/i, than will see if this is maf problem or you have restricted air intake.

Hmm...this is strange:

maf volt is rising, but airflow is decreasing :?:

How this can be possible? Isn't maf volts used to calculate airflow in ECU...so how higher volts can be lower airflow? Is there any other parameter for ecu to calculate airflow?

MAF sensor will measure kg / h this is volts. And then it is converted into mlgr per cycle (filling of the cylinder) that depends upon engine speed.
A possibly accuracy MAF sensor.

strange. i will expect at least 4.5v for 1200mg/i. you have low reading for maf @2800 and higher for that boost. for that boost you will have 1150mg/i <@3250 rpm and than slowly drops with same boost becose of VE. But your boost have some slovly drop to. maybe overboost and PID has taking over.

find your air flow linearization map in your soft. and post it.

mladenke wrote:strange. i will expect at least 4.5v for 1200mg/i. you have low reading for maf @2800 and higher for that boost. for that boost you will have 1150mg/i <@3250 rpm and than slowly drops with same boost becose of VE. But your boost have some slovly drop to. maybe overboost and PID has taking over.

find your air flow linearization map in your soft. and post it.

I think that this is MAF linearization?

MAF factor =0.8, Volt factor =4.887586!
Stilo damos max 772,8kg/h

If you wish to experiment:
I would rather make maf to map conversion than upgrading maf sensor...it is not so hard ;)

By removing maf and making map based calculation, you get better confort, constant pool (feels like train),
and you get rid of problems with all airflow corrections...for sample - most generation Mercedes diesel engines and most vans drive map based calculation...and there is nothing wrong with it. Also consuption wont rise...you also get rid of gaps while acceleration.

ecuedit wrote:If you wish to experiment:
I would rather make maf to map conversion than upgrading maf sensor...it is not so hard ;)

By removing maf and making map based calculation, you get better confort, constant pool (feels like train),
and you get rid of problems with all airflow corrections...for sample - most generation Mercedes diesel engines and most vans drive map based calculation...and there is nothing wrong with it. Also consuption wont rise...you also get rid of gaps while acceleration.

That means that I need to correct BEG smoke limitation map M_fuel = f(N, P_aircorr), and know how to limit IQ by P boost to maintain good AFR!?

I think that is too much job for something that actually works more or less OK. While I don't have problem with MAF, I'll like to stay on it. I don't think that this what happens with airflow is a big issue; I'm not tuning car for highest power and performance that engine can give. I'm tuning it for economy+some extra power (more power than stock) that can be achieved without major changes on car.
Currently, I think that EOI on higher IQ and RPM is not OK...so I'm trying to figure out how to correct that without too much messing with other maps.

Afterall...car driveability is OK, no problem with smoothnes, accelleration...can be driven on lower rmps and with lower IQ than stock, lowered consumption in everyday driving to work and back (about 0,5l - 0,8l on 100km/h)...and have enough power to reach more than 150 km/h on 6% uphill road.

So, now I would like to:
- fine tune EOI on WOT and high IQ
- try to lower consumption more by readjusting SOI, n75 and boost beetween 1500 - 2500 rmps but with little more IQ. Reason for this is because when I go drive out of everyday route to work, consumption gets much higher, and reason for this is very hilly roads where I live. In 3 km of road I have almoust 300m ascent/descent in altitude...somewhere road is more than 10%, 15% of slope...so ascending with 1,4 ton car consumes much fuel. And all that roar are single line village roads, so speeds are very low...about 30 km/h. So, how to decrease consumption in that conditions, when you have to ascend on 300m altitude in 3km uphill road in speed lower than 50km/h? :))