If you're going more than 28ish you need sensors.
I'm running 28/29 peak boost till redline with no sensors
Yes, but why? 4 bar is either 43 psig or 58 psia which is way more than 28.
You replied too fast for my edit to hold: Or is it kinda like device calibration where you want to stay away from the extreme ends of measurement capability?
EDIT:
Google got me sorted. 4 bar is total range and usually from -1 to +3 bar. For a second there I forgot we're drawing negative pressure until
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