2.7 boost limiting

 
Old 02-22-2017, 05:04 AM
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Default 2.7 boost limiting

Hi there!

I have a question ralated to an Audi A6 C5 / S4 2.7t -
from what information/sensors do ME7 decides what boost should it run or its boosting only on map data? Problem is that car limits boost - when its cold its running 0,3/0,4bar, warm 0,4/0,5bar, interesting thing is tat when warm car is left for 15-30min it boost 0,6bar for 1-2mins and then again is limited. Whith unplegged n75 boost a lot. made expiriment and installed manual boost controler parallel to n75 and regulated it so it boosts 0,7bar when wot - after 0,5-1 secundes n75 tries to limit it back to 0,3/0,4bar. N75, o2 sensors, egt are new. Without air mass meter (MAF) it works the same - no change. Could it be intake air temperature sensor or maf bleffing ?
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Old 03-07-2017, 02:22 AM
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Anyone? When it was warm couple days - car started to boost 0,7-0,5bar as it should, now its could and snow - again not boosting - could it be hot film air mass meter failure?
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