what are your ltfts

When you say it seems like it has ran like a turd ever since you bought it, how big of a poo snake are we talkin here?

Just off the top of my head I'd say try these things. Some of them may be obvious and its probably already been taken care of but anyways...

See if you can convince a buddy to let you borrow his coils for a couple minutes just so you guys can go for a quick drive around the neighborhood... You could definitely experience notable losses in power if your coils are on their way out, but they still have just enough juice left in them to not trigger a DTC...

Also are you logging overall misfire count? this would tell you right off whether or not you might have 1 or more weak coils...

Next obviously, have you done a tuneup since you bought the car? Spark plugs are super cheap if you haven't yet. Go get some copper NGKs... Also oil? You gotta feed her some of that delicious liquid GOLD! nectar of the gods!! Full Synthetic!! (I use castrol EDGE 0w - 40 "European Blend" its spec for our engines but depending on your climate you may want something with a bit more weight. Thats just my spring time/summer time jam)

What kind of filter are you running? stock air box? stock airbox with K&N? swiss cheese mod? cotton gauze cone filter? Round black colored piece of foam with a revo logo spraypainted on it?... Whatever it is give it a look see, if its long life and washable like most k&n and AEM dryflow filters give it a good cleaning...

I could go on forever... Long story short rule out any possibilities of hardware issues then move onto software. Same process goes for troubleshooting computer related issues.

Good luck man

Did you recalibrate for no airbox?

It is nearly impossible. The lack of an airbox makes MAF readings very unpredictable and non linear.

I still have the stock airbox if I end up needing to put that back on I suppose. I have a problem with trying to free up as much space as possible in the engine compartment and I hope it doesn't come down to putting the plastic box back in. I'm going to do some tests... After I finish removing/simplifying some emissions systems this week I will take another log, if the log doesn't yield good A/F I will put the box back on and log again. I am/was planning on adding an aprox. 12 inch long curved pipe to the MAF and relocating the filter where the old SAI pump was. I have hopes of the tube adding some stability to the airflow and consistency to the MAF readings. Lets keep in mind I am having a rough start due to (I think) leaky injector/s, which I am replacing with some EV14 550s in a couple weeks. My cylinder 3 knock voltage seems consistently high so it might point at that injector. Either way, I am going to solve this problem as soon as possible and continue thrashing for the stage2 1.8t thread. I feel like this is getting way off subject for what this thread was made for...

You can't just put a wideband ECU into a NB car; it doesn't work like that.

So I decided to give it a go, took my own ECUs bin, modified LDRXN and LAMFA tables/axis using this threads v7 file as an example. Car does go noticeably better but I ran into an issue I've been trying to chase down with limited success - it does not rev all the way to limit (6700rpm). It might not be a big deal since it's my daily car and I'm not revving it hard, but I'm very interested to find out why it does that. Revs doesn't drop or anything, it just don't go past ~5,5k rpm.
My first idea after reading this thread was injectors, but after looking at log, EGTs was below 850C and IDC was ~80% so that looks like won't be an issue. Since ignition system is converted to COP type coils, I took a look at dwell time map (KFSZT). I rember Prj saying 2-2.5 ms is good for these coils but at 13-14v @6000 rpm it was 1.3ms in my ECU. For quick test I copied over KFSZT map from AWT engine which has these coils as standard and went for testdrive. Car accelerated more freely than before all the way to limit. I thought I'm done with the issue until today when I went for another run to log it. Again ~5.5k rpm and no more.
Anyone please can take a look at log, what I've done wrong or not done at all? I'm out of ideas at the moment.
Engine is almost stock with some modifications:
- 058 1.8T with stock internals and stock turbo
- mildly ported small port head
- 50mm intake, FMIC, stock throttlebody and manifold, stock injectors and fpr
- 70mm downpipe, no cats, 50 or 55mm rest of exhaust (will change it to 60mm after drivetrain swap)
- Stock size MAF from different engine (AWT) with MLHFM map copied over
- COP coil conversion with NGK BKR6E plugs
- N75 valve from 2.0TFSI (because it was 12eur for new Pierburg)
- Crankcase breather system is all new with some modifications like 06A valve cover with breather outlet and oil catch can returning to intake just like stock.
Head and block surfaces were skimmed, but I used stock thickness headgasket if that changes something. Using only 98e petrol.
Sorry for such long post but I wanted to describe as much as I can hoping someone can help me to solve this so I can continue with tuning.
Thanks!