Not Hitting Max Boost Till Late In Rpm

[owned]

Hey guys,

I've got an 89 GTR. Mechanically sound and stock except for an AVC-R and cat back exaust.

Problem is that the boost controller is set to run 1 bar and the boost solenoid is pulsing hard at 90% duty cycle to get the boost to ramp up faster. Its not ramping hard enough, it does hit 1 bar right at the top of the rpm range (6600 or so). I've been advised to block off the blow off valve return pipe to see if the valves are leaking (remember they are 16 years old). Wastegate actuators have been checked and cleared.

Has anyone experienced this problem and any ideas as to what may be the cause??

[T04GTR]

perhaps one turbo is tired. or about to explode.

they are standard ones are they.

as a referance mines stock and reaches full boost (13 pounds ) at around 3500 loaded up.

6600 is way to late. id check te cat for blockages etc. apart from the obvious air leak checks thats about all i can sugest . sory