NefMoto

Hello.
I'm having trouble with my 1.8T APP project. The car cuts throttle in every gear around 5500-6000 rpm range and i can't find out what's the problem.
The setup:

ECU: 06A906032S
K04-001 turbo
Stock Intercooler
Custom 70mm Downpipe with 60mm catless exhaust system
S3 BAM injectors 3bar FPR
265LPH fuel pump

The problem occurd after I installed the exhaust system 2 years ago. I first thought mechanical problems, checked everything(boost leak test, vacum leak, N75, FPR, new intercooler, new turbo, new injectors, new fuel pump, 2 year old brand new bosch MAF,). The car was overboosting so I made the MBC-N75 parallel from s4wiki, the overboost disapeared but the throttle cut was still there.
In the weeks I threw the MBC out and tried tuning the KFLDIMX and turning the duty cycle down. It worked. The overboost disapeard but the throttle cut still a thing and I can't find the source of the problem. I tried playing with KFMIOP/KFMIRL maps but with no luck.
I attach my files. Don't mind me if you see stupid things, I'm a beginner to ME7 world. :D
I hope somebody can help me, I couldn't figure it out for 2 years now and it's really pissing me off.
The goal is to boost about 1 bar and to not throttle cut.
So my question is, what could causing the problem?
Thanks in advance.

Those ME7 logs are pretty useless.

Get a full single gear pull from 3k to redline.

You're literally missing one of the most important variables: actual boost.

rip out the parallel mbc. Its junk.

If you need one, your tune is bad, expect nothing but problems.

Thanks for the reply. I'll do another log today.

Reminder: if you need the MBC to prevent overboosting, there is no point in going further w/o a retune.

The MBC is out. I retuned the PID and it's working fine but the throttle cut still hits.

I've made new logs. The first with 3rd gear full throttle till the cut hit.
The second is the same but in 2nd gear.
I hope these are better.
Thanks.

still missing actual boost pvdkds_w

Your requested load is really screwed up.

Look at miasrl_w

https://s4wiki.com/wiki/Tuning#Disable_ASR

Press your ESP button before logging

Thanks. Okay I'll do that.

My requested load is way lower than my specified. It starts dropping from 5200rpm and goes down to 140% where the cut happens around 5800-6000rpm.

Here are my new logs.
Added the actual boost finally. 3rd and 2nd gear pull, ESP off for both.

I see no throttle cut in either pull

It's like hitting a wall. The car stops pulling and the rpm dropping slowly at full throttle.

If I let off the gas than push the throttle again, the car starts to move again until that 5800rpm range, then the same happens. I don't know what's happening.

You have n75 or wg failure, massive boost leak, your DV's are failing, or your inlet hose is collapsing. Absolutely a mechanical issue, not your tune as far as I can tell.

Throttle plate angle looks good, WGDC looks good, fueling looks right, ignition looks right.

MAF and pressure just drops off a cliff, for no reason. This means wg, turbo, inlet, or dv.

hmm.. Maybe that's the case. But my DV is brand new stock, my turbo and WG are brand new checked by turbo specialist, and I've tried 3 different N75's which were brand new as well.
I've checked boost leaks and i had some on the intercooler piping but it was only a clamp loose. I'll check another boost leak test to see if there are another leak somewhere. :\
Thanks for the answers. :)

Hello.
I've made a boost leak test and found out that my DV was leaking boost bad at closed postition, this was the only leak that I found. The N75 is good, the inlet piping seems good(no cracks or deformation.) I ordered a genuien new DV but it was bad too, it wasn't holding vacuum in it's vacuum chamber, so I replaced it with a new forge 008 and it's working fine but the car still hits the limit at 5600rpm.
I attach my new logs. Any thoughts?  ???
Thanks.

Your inlet pipe is collapsing under vacuum created by turbo suction.
Fit a proper pipe and an air filter that isn't as restrictive.

There is no throttle cut.

Also your IAT is 68C, and the pull is only 6 seconds.

I'm running stock air filter. Is that the problem?  XD
Thanks for your answer.  ;D

Your problem is doing a half assed job.
Upgrade the intercooler and the intake, also the TIP and fit a less restrictive air filter.

Just changing the air filter will not solve it.
Also it will not solve the insane IAT.

Or if you want to run it like this, reduce boost to 0.6-0.7 bar.

I'm aware of the IAT.. Cooler incoming. I just wanted a proper tune without that shit limit at 5500rpm.
BTW I went for a ride without the stock paper air filter and it went better. It still hit the limit, but at much higher rpm, around 6100.
Thanks for the help.

With that fall off it can only be inlet collapsing.

Proper tune is 0.5-0.6 bar on current hardware.
Unless you upgrade the hardware (intercooler, inlet pipe), then you have no business running the boost you are running.

If you set the boost at the correct level for the current hardware you will not have any cut.

Just because you bolted a bigger turbo on does not mean it does anything. In your case it does absolutely nothing except for increasing turbolag.

okay ;)