HOW MUCH PSI IS THERE TO A BAR
WOTS THE MOST BOOST MY STANDARD 1998 UK IMPREZA TAKE

 

1 bar = 14.7 psi

(and please DON'T SHOUT)

 

oops SORRY i do that all the time i dont look at the screen till im done

 

so is 1.2 bar 17.64 psi

 

1BAR = 14.5 psi
Standard atmospheric pressure =14.7 ie 1 atmos.
You will hit a fuel cut somewhere around 1.1 bar, not sure of the exact figure for your model. Lots of people run 1.2/1.25 bar and seem to have no problem. Others run 1.4-1.5 bar.
If you are uping the boost what about the fuel requirement?
Best to have a Knock Link and AFR guage to check the system over before and after or get someone to do the checks with a wide band lambda.

 

Spot on Harvey.

 

pressure conversion calculator,link below

http://www.ex.ac.uk/trol/scol/ccpress.htm