The ability for the OS to see N bars of psi and interperate it.
1 bar = 14.5037738 psi
2bar = 29 psi
1bar is good to around 10-12 psi of boost. It's good to leave a little left on the table. Most people go in increments of 10 in the boost world.
By bar, we are referring to the MAP sensor really. There are MAP sensors that read up to 3bars available for the GM OS.




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