ive just fitted a boost gauge to a 1995 wrx and when on full boost it reads about 18 psi. is this correct?
i used a T piecs to connect to the middle of the 3 vaccume hoses on the manifold.

would a air filter and exhaust effect boost?

 

No thats not standard boost, should be about .9 bar or 13?psi
18psi is more like 1.2/1.3 bar.

Tony

 

If there's no visual boost upgrade mods (bleed vlave, boost controller, FCD etc) Then you've probably got a module in the ECU which is giving the increase.

Had a similar thing when I put a gauge on a friend's 95 wrx (which felt suspicously nippy for std) Opened the ecu up to find a Jap module in.

 

Jeezuz! 18 psi?? It must be quick

 

well il have to check that out.
hope it does have a chip, i was thinking of buying one cos i thaught it was standard

 

i fitted gauge to mine and it read 20psi gauge is **** it only boosys to 15psi so might just be a poor reading gauge

 

there is no chip fitted so i think it must just be a crap gauge

 

Has it got a bleed valve or a mechanical boost controller fitted between the turbo outlet nipple and the actuator ?
It would also need a fuel cut lifter/defender to go above the 1bar fuel cut limit of the standard ecu.

It should also have a Z4 ECU.

 

yes it does have a Z4 but dont think theres any tuning been done.
does anyone have a pic of where to look for a bleed valve or boost controller?