NefMoto

Why some stock 1.8t(US version) have 132 g/s and others (EU versions) have 122 g/s ? Boost and RPM are the same.

After reflashing the first one has 170 g/s max (actual 1 mbar on high RPM), the second has only 135 g/s (requested 0.950 mbar, but actual after 5000 RPM around 0.750-0.850 mbar)

And I logged another (third 1.8t EU car) that was tuned even not by me. The same thing - 0.7 actual on high RPM, no leaks also, AFR is ok, max air mass 130 g/s, no DTC.

I think that probably cylinder heads are different. Could anyone tell me please am I right?   

The max g/s I've logged on my US 1.8T GTI is 206g/s using a stg1 file from Nuespeed. Boosts starts tapering down @ 5500rpm.

I have heard the heads are different. The intake ports are larger like the AEB head(US) has in the EU head models. But this shouldn't matter at all. The amount of air flowing through the MAF isn't going to change because the heads are different. Not to my knowledge anyway.

I've just compared 170gs log to 135 gs, and 170gs spool much much faster.

2120 rpm and 0.9 mbar. (170 gs car)
2080 rpm and 0.280 mbar (135 gs cars)

2 different cars (135 and 130gs) have the same logs. Maybe it just concurrence... With stock file the turbo spool very slow too.

There is a little oil into intercooler... Maybe problem with turbo?

 

What are the atmospheric conditions of the two cars your comparing.

Just because boost pressure is the same doesn't mean air mass will be the same. As stated earlier different cylinder heads could change the volumetric efficiency therefore you could get less or more air flow through the head at the same pressure..

You have cracked turbo - that's why turbo won't spool quick