Boost falling off

[Silvia_Drift]

Originally Posted by bb4_96

what do you mean by falls off. be more specific.

The boost will hold steady at 19psi until I get to about 6600rpm. From then on all the way to the 8000rpm limiter, boost falls off to about 15psi before I hit the limiter.

[jspaeth]

Originally Posted by Silvia_Drift

The boost will hold steady at 19psi until I get to about 6600rpm. From then on all the way to the 8000rpm limiter, boost falls off to about 15psi before I hit the limiter.

There are a few things:

1) Boost leak (i had this and it only caused boost drop off at high RPM)
2) Wastegate flapper can't stay shut enough to hold boost

[Silvia_Drift]

Originally Posted by jspaeth

There are a few things:

1) Boost leak (i had this and it only caused boost drop off at high RPM)
2) Wastegate flapper can't stay shut enough to hold boost

Checked for boost leaks. The whole system is mint with no leaks.

If the wastegate flapper can't stay shut, that would be a problem with the actuator correct? I don't think the actual flapper mechanism could be bad because it is a brand new GT2871R .64.