Re: Subaru STi to HFS-3 wiring diagrams (2004-2008)
1. Failsafe option #1 (safe mode) ...... section B (135) pin #27:
You only need the orange wire to trigger "safe mode" upon a failsafe activation.
2. Failsafe option #2 (boost cut) ...... section D (137) pin #27:
Cut and splice the brown (ECU) and white (BCV) into the wire leading out of the pin#27. Uppn fialsafe activartuibm, boost will drop down to wastegate pressure.
You only need one of the above options. I Prefer option #2 because it covers the event of a total power failure conditions. Option #1 will not work if you have a power failure.
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Richard L
aquamist technical support
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