3 bar MAF

[lskov]

Does the ADU engine have a 3 bar MAF?

It seems that I cant get any more pressure than app. 1.5-1.6 bar now.
When I adjust the pressure to more than that the engine starts to run badly.... (I have upgraded exhaust, turbo etc....)

[Greg_S]

have you had car remapped for new ignition timing and fuelling? if not the ECU can only compensate so much before things start going wrong.

Greg

[Jani]

Yes it does have 3bar pressure sensor.

Don't know how you've upgraded the Motronic maps, would suspect the same as Greg, it runs out of fuel & ignition maps

[s2driver]

MAF is Mass Air Flow sensor.....this doesn't have a pressure rating as it measures air speed which the ECU can determine as mass flow rate.
An RS2 has, as standard a 3 bar MAP sensor (Manifold Absolute Pressure). This is absolute pressure so can measure up to 2 bar above nominal atmospheric pressure (well theres an altitude sensor for further compensation inside the left hand A pillar).
Stock ABY S2 is 2.5bar MAP sensor and the 3B S2 has only a 2bar one.

Isklov, are you using a manual boost controller by any chance? This is not good on an S2 or RS2...be very careful. And you've upgrade turbo and exhaust too? You need a custom remap to take advantages of these changes to keep things safe/reliable and to maximise performance/economy.