boost trouble!!!

[heater]

ok hears the story....i had a bad boost leak @ the j-pipe fixed it and now the car @ owt from a dead stop boosts 20+ psi with the mbc turned all the way down! but when i go to wot @ high rpms it runs about 10ish????? what could this be this car has me fed up!

 

[heater]

ok i just ran a + vac line to the wastgate and sill am boosting alot 18+ so my guess is that it is the w/g acuator????

 

[95blackGsTurbo]

Did you run a vacuum line from yoru j-pipe to the wastegate. Also check and see if the line has any cracks in it as well.

 

[flinguist]

Boost creep? Going WOT at high rpm's, the waste gate may be able to control boost OK, but from low rpm's you might be creeping. Make sure your boost controller is installed correctly, and check your waste gate actuator. You can check the actuator by hooking up a pressure source to it. It should start to open at 9 or 10 psig, be careful not to over pressurize it, or you could rupture the diaphragm. If everything is working correctly, and you're still having the same problem, you've probably got a case of boost creep.