I have been trying to figure this out for months now. When I boost it doesn't hit full boost( 8psi) until about 5500-6000rpm. It used to do it at 2500rpm. Every once and a while it boosts great and 2 min later gone.....
Thing I have tested/ replaced:
-did boost leak down test =no leaks (up to 25psi)
-tested BPV for leaks =no leaks
-checked all vacuum lines =no leaks (21hg idle)
-replaced wastegate with ATP (old one leaked) =no difference
-checked wastegate flapper =lined up fine
-checked turbo shaft play/movement =great shape
-checked Boost gauge accuracy =same as SSAFC reports
-replaced cracked manny with Steedspeed = no difference
I even tried unplugging the wastegate to see if it would boost up to 16psi like it should but it maxed out at 11psi and no higher.
I'm at a loss......
Any ideas?
Thing I have tested/ replaced:
-did boost leak down test =no leaks (up to 25psi)
-tested BPV for leaks =no leaks
-checked all vacuum lines =no leaks (21hg idle)
-replaced wastegate with ATP (old one leaked) =no difference
-checked wastegate flapper =lined up fine
-checked turbo shaft play/movement =great shape
-checked Boost gauge accuracy =same as SSAFC reports
-replaced cracked manny with Steedspeed = no difference
I even tried unplugging the wastegate to see if it would boost up to 16psi like it should but it maxed out at 11psi and no higher.
I'm at a loss......
Any ideas?
Last edited: