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Turbo Wont Make Propper Boost Or Hold Boost!

chester_fb
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chester_fb Enthusiast

chester_fb

Posted
Posted

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

mad082 Grand Master

mad082

Posted
Posted

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

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