Do you have your maps rescaled to control fuel/timing at 125 load?

That sounds like you're hitting a point in the MAF scaling table where it flattens with increasing airflow. That would cause a rise in AFR if the map values were flat. If your fuel map is in the 10's, then you should be able to ramp it down after 5000 to prevent that lean shift.

No, don't increase fuel pressure above the stock setting. That is a rising rate regulator so it should be fine. To much pressure is bad as you get poor fuel atomization.

 

yup my timing / fuel maps are rescaled to 130%

i made my MAF scaling similar to yours and that did the trick

because mine used to be a flat 255 from 800hz and above, but now that i changed it to where the value increases, it helped keep my AFR steady i understand now.
i still have some fine tuning to do though.

 

so you guys got good results without rescaling the table to hertz? I thought 255 was the max you could go with the tables rescaled by the way...kinda confused here...

 

Rescaling it is just another way to view it in Hz instead.
It has no effect, it just helps for logging because it logs in Hz

Touringbubble, did you notice after upshifts during WOT it leans out?
Like from 2nd to 3rd

 

I'm using a different scaling. This was an odd ROM and had different scaling values. 255 is the max value (8-bit) if you take the scaling equation out of the picture.

Yes, I got the results I wanted with the tables I posted. Give it a shot.

4G, I haven't looked in to AFR on shifts as this was an auto car. I do have one 5 speed tune in the works but weather and travel has kept him from logging recently. I'll be sure to look in to it though.

If you are seeing odd occurences on shifts, you can adjust the fuel map in the load/RPM area where the shift takes place. You stay in open loop on a shift, so the changes to the MAF values will cause a shift there. You should be able to adjust the map to correct the issue pretty easily.

 

Thanks TB for sharing your MAF scaling values

I wish someone could find the correct location for REV LIMIT in ECUflash, that would be awesome to be able to increase it

 

^+1 i agree

 

So any update on this? I seem to have similar issues too. I go a bit rich into boost then the car stumbles. After I let off the gas or shift the car stumbles again. In boost my wideband reads 11.0 AFR, idk if that's the max it reads or if that's what it really is. Right now I'm playing with maf size, scalings, fuel tables and ignition tables.
Some help please.

 

11:1 should not be the max that the O2 reads, but if you have an Innovate product, you may want to verify the scaling using LM Programmer.

If you log airflow Hz in EvoScan, you should be able to use that data to dial in the MAF scaling table. Basically, as airflow (boost) rises, you'll need to increase the MAF scaling table in that Hz range to compensate for the extra fuel needed.

Increasing the MAF size value will also help, but it will increase your load level across the board. The issue with this is that it can cause drivability issues since the cruise load increases and you technically crush the WOT resolution in the maps. Increase this value only if needed.

 

Ok guys so I have read through this entire thread and realize this is the exact same issue I am having, around 4000-4500rpm range I lean out to anywhere from 12.5-13.0, I am using the evo maf and 440s, I pasted in the values from an 03 evo per senates maf swap and since my maf is scaled to 357 I am getting loads of about 155. I have my maf scaling maxed at 255 in the 800-100 range and still nothing? Should I lower my maf size? I am having the flatlining problem as well with the afrmap stopping at 10.01 even though my fuel map is at 7.4 was this confirmed that 10.01 is the lowest the ecu interprets?

 

At least the first few pages of this are so "sticky worthy" because anyone with a stock lancer rom trying to tune a turbo setup will NEED to do this unless they use a RR FPR or even an FMU or some sort of other bandaid type fix. Really good thread, and I will post an edit of my MAF scaling once I finish so that anyone else can see it, or compare at least...lots of good info.

 

I gave up after about 20 pulls or so, and flashed the evo rom. With the evo rom, my AFR's would "stick" right where I want them, no problem what so ever. I don't believe that MAF scaling is the best way to adjust AFR in boost, and here is my reason why.

When I had MAF scaling increased, the car would get richer, but the problem is, if I didn't scale it enough, then I would still be lean at WOT. If at that same level, I push down say 60% throttle...I'd be richer than 10afr. To get an acceptable AFR at full throttle, the partial throttle open loop will be too rich. There has to be another way to make these changes, and I don't know what it is.

Is everyone giving up on the lancer rom and stepping up to the evo rom, or are there people who are turbo'd still using the base rom? How is it working out for you now, still lean under boost or rich at partial boost? Maybe I was doing it wrong, or something of that nature.

Another key point, when I swapped to the evo, my MAF scaling I am using is "stock" for the lancer base maf sensor, as well as size and all that. So it obviously isn't entirely the maf's fault, since that MAF works great under boost on the different rom. Another key point is the "AFRMAP" logs down to 10 on the base lancer, and no lower. On the evo it will continue to drop, so maybe there are a few limits that aren't defined that could be lowered, dunno...dead end for me, since I swapped to the evo one. I guess I just wanted to put my results here so that if anyone else is having the same sort of questions I did, they'd see my results.

 

Just checking in after being away for a few years. How is everyone's lancer running? I'm still driving mine, but she is in need of some engine work. I mainly use her for the 2min drive to work now. I have an exhaust leak on the exhaust manifold and I think my valve seals might be leaking. Hehe kinda don't want to spend any money on her but all this talk about using Evo roms and such is giving me a bug haha. My only issue is I have the auto tranny. Anyone come up with a solution for using the Evo rom/ecu on a/t?

 

Nop you can only use an evo rom with the m/t because the transmission control module is the ecu itself for the lancer

 

Yeah that's what I figured. I know some people use two ecu's on their galants for dual control. Just wondering if anyone has done it on our lancers. But I'm going to assume no one has hehe.