Jump to content
SAU Community

Turbo Wont Make Propper Boost Or Hold Boost!


Recommended Posts

hey guys

ive just dont an rb25det conversion in my Hr31 skyline,

im running a Garret T3/T4 turbo

my problem is that it starts coming on boost at 4.5k rpm, makes 6psi then as soon as it hits 6psi it drops back down to 2-3 psi

it will not make over 6psi even without the actuator hose running.

the turbo is visually fine, as in no shaft play etc. we did a boost leak test and it was fine.

any ideas guys?

cheers

Chester

Link to comment
Share on other sites

problem with the cat/exhaust? a mate had the rear honeycomb section in his cat break and it had turned sideways and was blocking the hole so that with the wastegate hose disconnected on his 3076 it was boosting up to 16psi and dropping back to 12psi at redline.

is the intake pipe being sucked shut?

is there a blockage in the intercooler piping? this wouldn't show up on a pressure test.

does it make any funny sounds?

could be an exhaust leak in the manifold

Link to comment
Share on other sites

we've checked the cat, and no blockages there

no blockage in the piping, we've taken them all off and put them back on again

no funny sounds, just sounds like a normal turbo

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share



×
×
  • Create New...