90+ Nissan 300ZX GReddy Profec Installation

By Brian Duley

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GReddy Control Components (Profec, Turbo Timers, Rebic and Simulator)

Overview

I disconnected the electrical connections for the wastegate solenoids (which are mounted on the intake side of the turbo by the battery on the passenger side and by the dipstick on the driver's side.) This reduces the stock boost form 9.5 psi to 7 psi wastegate default (the Profec allows you to adjust the boost pressure from 7psi - 14.7 psi safely. The wastegate hoses need to be removed from the bottom of an intake pipe and T-ed together at the back of the engine then run to the Profec stepper motor. Then you run some vacuum hose from where the wastegate hoses were hooked on to and T them together and run it to the stepper motor. Then the 3rd hose you run from the balance pipe to the Profec.

Where to mount the actuator???

The actuator is a gold box about 2 cubic inches (5 cubic cm) and works like an aquarium pump. It sucks air out of the line that goes to the line that goes to the wastegate. The actuator has 3 vacuum hose connections on one side and one atmosphere inlet/exhaust on the other side. I removed one of the 10mm bolt (head size, 6mm thread size) that holds the HICAS solenoid in a put in a 10mm bolt that was 60mm long with 2 nuts between the HICAS solenoid. This allows the stepper motor which allowed me to raise the stepper motor above the HICAS solenoid. A 10mm crow's foot is about the only way to tighten up the 2 nuts. Below is a picture of the acutator.

The cotrol cable is visible at the top of the picture. I is very important to position the inline filter in the so that there no interference with other object in the area. I highly recommend mounting the actuator before running any of the hoses so you know the exact length of hose to run.

Profec control unit

I mounted mine in the center console next to my GReddy Turbo Timer.

As you can see the PRofec is slightly larger that the turbo timer, but the cases are the same design.