Quote:
Originally Posted by adc
You misunderstood - I meant that the BMW software can compensate for unfavorable atmospheric conditions (such as altitude) by increasing boost up to 11 PSI. So the JB1 and SSTT are setting their boost targets to these values, safe in the knowledge that BMW would not hesitate to work the turbos more.
This amount is not specified in any public documentation as far as I know - it's something the tuners discovered when breaking the OEM program. :smile:
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So what happens when you run a N54 with JB1 or SSTT at altitude then?
I recall seeing somewhere that the max safe (or maybe it was the nominal) pressure for the turbos (specified by the manufacturer) is something like 12 PSI. Actually, I don't remember what it was, I just remember 12.