So started my tune not so long ago and feel like its going OK so far. Now I've increased my boost significantly it looks like my car is over-correcting when I peak, to the point where it dips under requested, comes back up again and overshoots. I've done a bit of reading and tried to make sure I'm logging the correct variables to help solve this.

spec is:

k03s 1.8t
2.5" cooler pipework and fmic
4bar fpr 317cc injectors
2.5" exhaust system no cats
intake pipe etc etc

From the wiki i can see that it says if ldimxa adaptions are happening (there are some) I will probably need to look at changing KFLDIMX and LDIATA. I'm thinking that the PID being stock is the reason for spec boost not meeting requested though I could do with some more expert opinions 

I'm hoping its not related to KFMIOP or KFMIRL being tuned incorrectly. From the variables I am able to log i can see that mifa_w, misol_w, migs_w and miist_w aren't exceeding miszul_w and i have no crazy timing oscillations that would make me suspect its the torque model causing the problem though i may well be wrong.

Hoping I can get some advice on this to move me forward. Another problem i have is that i cant seem to line up/define KFLDIMX correctly in my file (032TL ecu) when comparing to a 032HN the hPa axis doesnt come out right as pictured, can anyone offer advice on finding this or even possibly help me find it as I think even if this isn't my problem at the moment it'll need looking at soon. In the meantime i shall continue to study the wiki and probably get on youtube to watch some videos on PID control.

thanks in advance,

Dave

Thanks for the reply, I've attached a picture of LDRXN as it is in my file, around 3500-4000rpm requested boost seems to take a dip but I'm not sure why since my LDRXN doesnt look like it would have a dip at that point. At this moment I'm unable to properly define KFLDIMX  though I've defined LDIATA

When you say copy and paste how do you mean? I've been defining maps the only way i know how to which is to compare windows in winols, then when i find a match I transfer the map structure. As I've moved along I realised I need more maps so have kind of been adding them as i go along. I'm not sure why i was able to find KFLDRL but am struggling to properly find KFLDIMX, Is there a better way i can learn for finding maps? The axis data just doesn't look right at all lol

The .kp file i uploaded is all my work, albeit the file could be better i have defined a fair amount already. I have been unable to find a damos for my ECU. I really would appreciate some advice on how to find the maps correctly, as at the moment I'm a bit stuck lol

Thank you very much! my axis now looks correct  may I ask how you managed to find that? I'd like to learn how to find them rather than just having to do it by comparing.

Thanks again, that was a big help to me.

Will do, i just did that so i could squeeze it on the screen! 

Yeah there is little info on these ECU's. I had found all the maps I needed just by comparing up until now. Maybe i should have just used a HN or HJ file as i think they may be able to be cross-flashed and there are some good damos around for those lol.

Have you successfully tuned KFLDIMX for your car?

I'm going to do a lot of reading and then try to sort out my boost pressure overshoot.

Thanks! I think i have been getting a little confused and concentrating too much on KFLDIMX.

Should I make changes to KFDLULS since as the moment I have not had any throttle cut from boost deviation? I think standard values are 400mBar and from my logs the max deviation i can see is around 100mBar.

I'm a bit confused as to why we make changes to KFLDIMX so i need to do more reading on that. 

As for KFLDRL, as an example is this the map i would use to correct the overshoot, since the result of the PID goes to KFLDRL and then dictates the n75 duty cycle - would I find the part in KFLDRL that lines up with the rpm range where i see the overshoot and slightly reduce the duty cycle to cure it. Is this the correct way to tune it?

My bad - Thanks for clearing that up though.

KFDLULS wont get touched, I'm not getting any pos or neg deviations (yet) - and if i was then increasing these limits wouldnt be the answer to those problems right? 

Looking at my I adaptions I can see there is some, from your wiki it states if they're downwards then I'm overboosting. I'm now just not sure what this info means in terms of making changes to KFLDIMX and LDIATA

No doubt, it seems like a big subject and a complicated one to cover easily. I think youtube may be my go to place for a half decent noob explanation to try and fully understand what is happening with my boost control.

Slowly but surely moving forward with this so thanks for pointing me in the right direction. It makes it a whole load easier when you at least know what not to do - and also what I need to know/go read up on.