Common boost leak areas

[greylee]

im pretty sure i have a boost leak , but i could be wrong . i dont have any play in my turbo and its brand new .


i had a big 16g installed about a week ago it worked okay for about 300 miles but now its really bogged down. when im boosting.the guy who did it hooked a vacum line from the jpipe to the wastegate and said that should cut off the boost at about 10 lbs ....but it never did . i pushed 20 lbs everytime i nailed the gas.


right now my car is slow as hell . i took off the intake today and saw that the stock boost control solenoid was plugged into my wiring harness but the vacum lines dint go anywere.
maybe this could be part of my problem.


im taking it to a shop 2marrow mourning and hoping they can boost leak test it for free if not i will buy the parts to make one but it really annoys me that i cant find it on my own . where else but the : intake , Bov, intercooler jpipe could it be leaking from?


i bitched at the mechanic today when i saw that boost controler and he said ill melt my engine without the proper mods on my car .... but that thing is plugged in so it has to be sending some kind of data to my cars ecu right? and if its not plugged in its not accurate data....



i just moved down here so im kinda i need of assistance if anyones in the ft.myers/ naples area. drop me a message.

 

[->PrOjEcTGS<-]

Common leaking points are: (starting from the turbo)

J-pipe
Connection from J-pipe to LICP
LICP to SMIC
SMIC
SMIC to UICP
BOV
BOV Flange/Gasket
UICP to Throttle body elbow
TBE gasket to TB
TB to Intake gasket
TB shaft seals
BISS
Any and all vacuum lines off the intake
Lower Injector Seals
Intake manifold gasket
Intake valves
Intake valve seals
Piston rings

You could also have a PRE-turbo exhaust leak. This would be either at the manifold to head gasket or from the manifold to turbo gasket. You can run some seafoam through the engine to find those leaks.

Depending on what type of 16g you have, some have a 10psi WGA spring while others have a 15psi spring. Running a line directly from the J-pipe to the WGA should yield the lowest possible boost pressure the WG will allow. Now in your profile you say you have 3" exhaust. Is this from the turbo (O2 housing) back? Or is it just a catback? With a full turbo back 3" exhaust you are going to experience a little bit of what we call "Boost Creep". Where it will, when at WOT, go straight to the WGA pressure then keep on climbing after that. This is because the exhaust gasses would rather go out through the turbine because of it's free flow, than the wastegate port. The higher the boost pressure you run the less of a problem you have with this.

 

[Gstclipse69]

Anyone that runs a boost controller does not need the stock boost control solenoid vacuum lines hooked up. You just need it plugged in so you do not get a CEL. With a line running from the j-pipe to the wastegate you should be at stock boost levels, 10-15 psi. As project has explained, you could be creeping to 20.