NefMoto

Hi all. I received this error on my me7.5 1.8t Auq with bam file
P1555 - 35-00 - Maximum Limit Exceeded
Can be from IOP/IRL , because all other things are "disabled" , torque intervention is active too!

So you're not going to post a log?

I would expect it has to do with the hardware differences between the two as turbo, maf, injectors, egt probe are all differences the cars have. Although, without any revivent info its just speculations.

KFLDHBN, maxed 3.8
LDPBN , maxed
KFTARX maxed
MAF is scaled for my sensor and my case.
Maf at throttle is the same like maf read in the log because i adjustred a little KFURL.
KFVPDKLD made it 3 for all cells.
Sincerly only thing i can think is iop/irl but.....it is strange to have this error from them
Last column in IRl for 100 is 240 for all cells , LDRXn is 245 over 3500 rpm and iop for last axis 230 is 100 for all cells!

I have no idea how you expect anyone to help you if you refuse to follow forum rules.

https://s4wiki.com/wiki/Tuning#Negative_deviation_.28overboost.29

I can't believe you made me look this up.

P1555 is actual boost too high for the PID to fix.

If you had posted a log, it would be immediately obvious.

17963/P1555 - Boost Pressure Control: Upper Limit Exceeded
Possible Symptoms
Reduced power output
Limp mode
Possible Causes
Boost Pressure too High
Hoses/Pipes incorrect connected, disconnected, blocked or leaking
Charger Pressure Control defective
Solenoid Valve for Boost Pressure Control (N75) defective
Possible Solutions
Check Hoses/Pipes to/between Components
Check Solenoid Valve for Boost Pressure Control (N75)

google is simple.....

Not just google, its literally both in the FR *and* in the S4 wiki tuning page.

The confusion comes when the various messages look like "negative deviation" which implies it is underboost.

Sounds like a extremely shitty tune.

_nameless  from where you had this conclusion?
Fogort to say, i had 5120 hack modifications.
The boost desire is under actual , but if i rise ldrxn and touch iop, irl  i affect the load specified will higher than load actual.

Are you going to post a log any time soon? His opinion means nothing until you do, and you have ample information here in this thread to solve your problem.

Its just overboost issue caused by wrong pid calibration or hw issue
Why the hell people trying to deal with overboost by adjusting desired?

"Why the hell people trying to deal with overboost by adjusting desired?"
I want that boost(overboost) because i want the maximum what can i get from this turbo, but desire i can not increased............maybe i'm a dude and i don;t know how can i increased diser boost. If i increase ldrxn....the load will goes to hell.
My drl and imx are maxed because there i had the boost what i want (not exactly because the spool is not so far, but i will try to adjust again and again the wastagate line).
In the 5120 hack i think i some things witch the "smart" guys not said, something about KVLAD , KISRM, LDRQ0 , LDRQ0S,  LDRQ1ST, KFLDRQ2
I post a log not in full throttle to see what happen in normal drive.

Mate you posted a pic of medical prescription :D You better remove that fast

So you maxed IMX and DRL maps, and when asking why maximum limit exceeded? If your turbo stock, you dont need to touch this maps (or transfer maps from other file with this turbo) :D Maybe i'm noob, but tuning should be step by step - increasing (boost, for example) by little steps and logging every time. But you maxed everything to see limits? Why? And make real log, from low rpm till redline with 100perc. throttle, i dont think you'll get help with this "log"

Horrible log.

Even part throttle you didn't notice the horrifying overboost and the *constant 100% WGDC*???

I don't get exactly what your thinking is here.

I think you need to go back to basics, read a few books, start with bone stock, and dont' do anything but study stock logs for a few weeks.

How about now?

Echoing the above. Looks like crap.


95 WGDC , overboost etc. What are you trying to achieve?

Switch to feed forward or something - idk....

Yea its pretty clear he doesn't really understand what any of those maps do.

I don't think he understands anything about anything.
Not even about the fact that if he jams the wastegate shut the engine will probably throw a rod and the turbo will explode.

Many smart guys......i realy know what i made.
I tried to get the maximum from my turbo. The spool is not so fast and the wastagate line is not a normal one and i must make an "homemade" one, bit many of peoplese witch only put some words can not do this. Yes i the wgdc is 95 before 4000 because i can not make my wg stonger begore and it is too week after, and i can not make it stronger physical.
I had a good new gtx2871r and never my engine will explode. It is made by myself in very good conditions and with very good pieces in it.
No retards . good afr.....injector when i touch 2.3 bar(without 1 bar atmo , so 3.5 bar with atmo) are at 80% , but......"i don't know what i do".
I found my mistake and for other noobs witch maybe waiting the same answer like me about this error with charge pressure limit exeed , it is : YES.....is is from IOP and IRL if you don;t disable torque interventions. And about this, i can not do it , because my dsg had its torque intervention too! AAAAA, forgot to said, my stange 1 dsg file made by me is awsome. I had many modifications and for this i opened this topic, because i don;t think can be from a little bad compensation between iop (especialy axis) and my irl.
Waiting your comments for my new nice log! I have a little to adjust it.  FOGOT, LAMBDA control is a beauty!

You can hide a shit under the carpet, but will you call it a "fix" ? I believe no
So raising plsol also wont do anything with overshoot except for hiding it at WOT
Thats nor a rocket science to made a line to wg, start with fixing hw issues before any sw tweaking

idk about tq interventions.. just dont get it

I don't have something to hide, i want  that boost , witch you call overboost , but boost desire is too low....i don;t have nothing to adjust to my wastagate only if i can obtain more boost from lower to higher rpm. For resolve boost desire , to increase it to be exactly like actual boost in part throttle i will request little more torque an will adjust a little kfurl.
For the moment it is enought 2.3-2.4 bars, before i will mount an external fuel pump with surge tank.

I don't have a problem raising req boost to match actual if actual is already more or less where you want it.

NICE, we have a common point.
I will try to find and wastegate with stronger spring , because garrette spring had 1 bar for not force n75 to 95% everytime.
I will come back with new logs when resolve the problems.