Ive done an engine conversion with a K04 1.8T.
Engine hardware is as found when i purchased engine apart from rebuilding with rods and exhaust valves. 3" DP > 2.5" exhaust.
Wastegate is as i received engine. It was apparently running fine with an APR map but due to not being able to code out the various part that arent needed on that map, I decided to put a BAM 018AH flash onto it and have a go at tuning it myself.

Probem im having is, the boost is way over what is required. And i seem to hit a charge limit if i turn boost up.

I have adjusted fuel to a better profile but boost is always spiking high and staying there. Wastegate duty doesnt seem to be able to control it.

Can someone help diagnose whats going on? Boost leaks checks have been done STFT's are around -0.6%. I've taken some logs with standard LDRXN profile and with N75 disconnected.
You can see the boost just increases upto around 12psi. It seems to point to a stronger wastegate spring but the turbo seems to take longer to spool up. Unsure of what it should look like with the N75 dissed. I'd expect a k04 to spool earlier. Or could the map sensor be overreading? I will have to double check boost gauge to rule this out.

I havent tested wastegate pressure as yet but if it is stronger can i be pointed to some info on how to tune boost pid to enable N75 to control boost better.

Full log is too large to post it seems.

First I'll be checking operation of the wastegate as it seems to have some boost creep when on wastegate only.

Tune out boost creep with KFLDRL

For a constant output from the PID, KFLDRL should compensate such that the actual resulting boost is constant.

Is it just a case of adjusting dc on the last line?

Seems a bit crude to do that?

Thanks for the explanation. I did wonder if DP and filters would affect this. Clearly it has.

I will look into this further. I did see a post where I said to start pid from scratch. Is that the way?

Read that here http://nefariousmotorsports.com/forum/index.php?topic=517.msg4013#msg4013

In my XDF I have TLDOBAN.  I have read that this is zero 'd to help with overboost.

In my map it has 10.00 across the board. Would this help with initial overshoot?

I have actually been doing this. I had issues with this as no matter what duty I put I LDRAPP, the wastegate seemed to be similar to 0%.  Further investigation led to me realising that at 90%, wastegate duty was showing ~31% actual. The XDF I was using that I had found on here had no calculation for the map.  This was corrected and I could then see changes.

I have logs upto 70% but haven't yet been able to translate with spreadsheets I have

Although it seems from reading the 2.7T tune thread, I may only need to tweak DIMX as I have a stock wastegate and the larger DPs have an effect on the WG Duties required .