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1995 Ford Probe Multi-Stage Boost Control Vacuum Routing Diagram - Wastegate Setup

Hand-drawn vacuum routing for turbo boost control: VRIS solenoid (normally open), Greddy Profec boost solenoids, Turbonetics 0-25psi controller, evap purge valve (normally closed), dual-port wastegate.

AI caption · Photo 569 of 1264

This is a hand-drawn vacuum/pressure hose routing diagram uploaded as "multi stage boost.jpg," illustrating a custom multi-stage boost control setup on a turbocharged vehicle (claimed to be a 1995 Ford Probe). The sketch shows a turbocharger with a dual port wastegate connected via hose routing (red lines) to several components: a VRIS solenoid (noted as normally open), a Greddy Profec boost solenoid unit (with IN and OUT ports), a Turbonetics 0-25 psi manual boost controller knob, and an evap purge valve (noted as normally closed). Blue lines appear to indicate electrical wiring, with instructions to "connect vris & purge valve to same latching relay" and that the system is "reset w/ press of clutch." A note near the VRIS solenoid warns to "plug this end or boost leaks." The diagram documents how a repurposed VRIS solenoid and evap purge valve, controlled by a latching relay tied to the clutch pedal, work with a Greddy Profec electronic boost controller and Turbonetics manual controller to switch between boost levels feeding a dual port wastegate. No part numbers, years, or vehicle model identification appear in the document itself.

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Frequently asked questions

What boost controller is used in this multi-stage boost setup?
A Greddy Profec electronic boost controller (boost solenoids) combined with a Turbonetics 0-25 psi manual boost controller knob.
How are the VRIS solenoid and evap purge valve wired?
The diagram says to connect the VRIS solenoid and purge valve to the same latching relay, which is reset with a press of the clutch.
What are the default states of the solenoids in this setup?
The VRIS solenoid is normally open and the evap purge valve is normally closed.
What type of wastegate is shown in the diagram?
A dual port wastegate connected to the turbocharger.
What warning does the diagram give about the VRIS solenoid?
It notes to "plug this end or boost leaks," referring to one port of the VRIS solenoid.

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