Hello there,

I am a very begginer in tuning, used kess to read 2000 Nissan Almera YD22DDT 2.2 81kw EDC15C2 ecu, watched the vagecumap series and tried to remap the car. Car isn't expensive, my goal is to try tuning possibilities and it won't be the end of the world if I will blow up the engine - I am not scared to make mistakes. I am used to diesel working principles, how lambda value affects things, how much boost is relatively safe and etc, so basically I am interested in technical things about chiptuning and map finding.
I will attach (or at least try to attach) the original file and the one I already made. It is spiky and inconsistent, but that is not a big deal - I will work on the comfort in the last place.
It seems that improvement is feelable, maybe a little bit better response, but at first I was limited by 50mg of fuel and now I tried to inject 65mg - there must be a big, noticeable difference but there is no. Perhaps I am limited by somewhere else.
Changes I did:
71B9A must be drivers wish. I increased the values from 60 to 65 at the top.
738A4 torque limit. I increased the values by percentage in whole table so the limit would be 65mg@3200rpm
73976 smoke map. I increased the corner values and the x axis last value so I would get 65mg at 1040mg (maf) and afr around 16.
746BA boost map. Increased last two columns and x axis last value so boost increased from 0.8 to 0.9 bar. This slight increase looked a bit too low for the injected amount of fuel, but I counted it like that. I will sort it out later, no problem there.
78460 Egr map. Just made all the values high. Egr is closed mechanically though.

What am I concerned about:
1) In the torque limit map the Y axis values are 600, 601 and 602 mbar. There is no pressure like this where I live, its regular 1000. What does ecu do in this case? Maybe the 1000 are somewhere else and I am limited by that place?
2) What are the other numbers to look for single value boost limit? The number 32043 gave me the svbl of 0.98bar which I hardly believe because boost limiting map max value is 1.2bar. I can't remember the other number vagecumap guy told, but I tried and it gave me nothing.
3) The car uses VP44 pump. I have heard that there is nothing I can do with pump voltage because it is driven by the control unit on the pump. Is it true and is there any way to make something with duration through the main ecu?
4) How else the fuel can be limited in this case?
I have a file that I found on a cheap and basically useless map pack. It made the car perfomance results, I would say, the same as mine (if it did at all), but it had changes too in the following maps:
726CA
73AF2 must be something with temperature
73DEA must be something with temperature too
Maybe someone can tell me what are these maps?
I will try to attach pictures so it would be easier.
I would really appreciate your answers. I don't see any problems in looking for answers by myself, just please show me the right direction.

Thank you!

DW- I would put higher. You will have a better response to the accelerator pedal. Torque limiter do not put more than 20% under 2000r because you can damage the clutch. And pull it slightly to higher speeds. According to the values of the smoke map, it should smoke a lot. If it doesn't smoke too much, leave it at that. Don't you have a turbo controlled only by overpressure without the intervention of the control unit? If so, the changes in the ECU have no effect. Try raising the DW and you'll see. But increase it even with a smaller push of the accelerator pedal.

7415E 6x6- That map looks like IQ limit by temp. If it is temp of oil it can limit your IQ... I dont know if you have a oil temp sensor in your car but try to set this map to 65mg... and that first two maps you mentioned looks like some calibration maps... Third map i have no idea what is it for but it build on the previous 2 maps 12x13. I think that 3 maps are not important for remap

If you have pressure control wastegate actuator... there is another posibility... Try to raise pretension of spring turbo actuator... simply on the rod. You should get higher boost

Milansvk,

Thank you for the reply. You gave me some valuable information.
Actually I didnt event thought about the self regulating turbo, as I found something that looked like a N75 map (74A7A) for me.
After a quick check I realised that turbo self regulates. Big shames on me.
On the way to buy a manual boost regulator (it is a pain to reach the wg rod) and a gauge I thought of something: autel maxisys shows the maf value - it is the key for me to know where at the smoke map am I. And what it showed - I get max of 850mg/stroke. Just as much as the stock smoke map air flow maximum value. Right, lets give it more!
I installed the boost driving stuff and the gauge. The stock boost measured was 1 bar. Stock boost map was at 0.8bar highest, boost limiting map - 1.2bar.
I started increasing boost little by little to reach my desired 1040mg/stroke maf so 65mg of fuel would be injected. What I ended up with was around 1.4bar and maf around 930mg/stroke as I wasn't feeling safe to raise boost more. It would be nice to get some information from the engine before blowing it up:)
I was expecting engine to accept air better, but as I was not going to raise boost - I had to live with 930mg/stroke.
I started remaping again, this time not to make a usable map but to see where am I going. Increased DW, Smoke, Torque maps so I would get 65mg of fuel at maf starting at 850 and up to 930. I was expecting car to be vomiting black smoke, but there was none.
In the evening I remembered that I forgot to do the i.q./oil temp map - shame on me again. Though, as I was looking at it, I should be limited only on very high temperatures (definitely didn't achieve those). Unless its percentage, not i.q. and there is a correction factor for temperatures? Anyway, I will do this map on the next try.
My notes:
I was running 1.4bar of boost. Limiting map is on 1.2bar maximum. Owner of the car looked for the map sensor and could not locate one. Is it common/possible that engines rely only on maf value and judges everything from it?
Car is running way better, but not as good as it would be for injecting +15mg of fuel as I imagine.
So now I am pretty sure that I am not injecting as much fuel as I try. I will look for some technical information to try to find if I am not limited by nozzles or the pump itself.

Best Regards!

Hmmm. Thats quite high boost on stock turbo :D With 1.4 bar boost 2.2l displacement you should have approx 1350mg of air. If it have not intercooler maybe 1100mg of air... So there are two options- 1) Maybe your MAF sensor not read properly... It is frequently with older MAF sensors. 2) or your stock sensor is not calibrated above 930mg of air. Try to clean or buy new MAF sensor or try to find MAF sensor map.

Unfortunately, I did not find the sensor map. But since it is also used in more powerful engines, I think it will have sufficient range. Try cleaning it with a degreaser and if that doesn't help, replace it. If the sensor did not have a sufficient range, you would find out by showing you, for example, 930mg at 1.2 bar and also at 1.4 bar. Above that value, it will not react to the increase in pressure. If you achieve this, let me know exactly how much this value was.