ok all my setup is on t3t4 .68/.48 54wheel turbo,ssauto ---- manifold,johnntracecar front mount,450's,TE2.0,ps9 1 wire vtec ecu, custome 3"dp/2.5"ic,focus intake manifold, z6 block y8 head,b16 throttle,aem cam gear,block gauge,bored.025,srp pistons, factory shot peened rods,arp studs, anyways i'tll hit 10 lbs or so sometimes 11 but y does it just all of a sudden only go to 4-5psi? but other times it will go to 10?

 

check for leaks on the charge pipe?.
do u have a MBC?

 

nope i pulled the vaccum hose from the turbo it'l boost 10-11 psi but it will just sometimes only boost 5, like when i first drive it it will boost maybe and if it dose its only for a bit, then it drops down to 5 or so. im thinking maybe the map sensor, cause at 10 i can feel the obd0 map sensor cutting out im thinking its doig it at 5 also cause its wanting more.

 

is it ur wastegate? that's weird... ur not even using a vaccume? lol maybe that's it? some of ur boost is leakin out of that hole when the pressure builds up. if ur not using a vaccume atleast plug it with some jb weld or put a vacume hose on it then put a screw in the hose

 

i wanna use the wategate though lol, but it has a pattern to the way it does it like when i first drive the car, then after awhile it will only boost low? i might try tensioning the wastegate more by loosening it and pushing it down.

 

Eric, sounds like your wastegate is probably only set at 4-5psi, its internal right?

where are you running your vacuum line from? i wouldnt run without it, you dont wanna mess up your new lil setup.