manifold pressure

does anyone know how much pressure should be in the manifold????

I'm assuming your talking about intake manifold not exhaust??

What car is it?
Turbo?
Pressure at idle or when??

pressure at both idle and when under load

depends on the car and what mapping has been done or standard.

Standard STi is:

-0.5/-0.6 bar at idle
0.9 bar at boost

Isnt a standard sti boost only .8 bar......???

WRX/STi Saloon ECU’s 2C, U8, W6, W9 14.57 psi 11.47psi held to redline==.7 BAR
WRX (1995/96) ECU Z4 15.65 psi 12.71psi, dropping to 11.78psi @ 6600rpm==.8 BAR
UK/Aus/Euro ECU’s V7, 7D and 6D 14.87 psi 11.47psi, dropping to 9.47psi at 6600rpm ==.6 BAR
UK Prodive ECU 15.65 psi 13.33psi (peaks to 13.64 @ 5600rpm, drops to 12.71psi @ 6600rpm) ==.9 BAR
STi RA (1996) ECU 7K 15.96 psi 13.17psi (peaks to 13.64psi @ 5800rpm) ==.9 BAR
WRX Wagon ECU V9 13.79 psi 10.55psi dropping to 6.84psi (starts to drop @ 5000rpm

Should've stated I was talking about my STI type-r.

Was waiting on more info about what car he has. The questions are a bit vague.

But thats some good info you found there Scoobyke