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Monday, November 16, 2015

HICAS and the R32 Nissan Skyline GT-R



HICAS.  Super HICAS. Four Wheel steering. 4WS. People say all kinds of things.  The R32 GT-R technically has Super HICAS on it. Its a hydraulic mechanical four wheel steering system.  The OEM power steering pump has 2 stages. One for the front steering rack, and a rear stage for the rear steering rack.

Not a lot of people like the system. It can fault. It can leak. It sometimes does odd things. When the rear wheels steer it can be a bit unsettling.  The system is very similar to the 300ZX system. Also it can be found on a number of other Nissans.


The original purpose was to help with handling, and even low speed maneuvering. At higher speeds the rear wheels turn in the direction of the front wheels, making things like lane changes a little easier. At low speeds they turn counter, allowing the vehicle to have a tighter turning radius.


You can see in the above diagram, the rear wheels on turn in, go counter the front wheels. This helps to rotate the rear end of the car. They then turn in the direction of the front wheels to try and keep everything in line.


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Buy-R.com for Nissan Skyline GT-R and GT-R parts.

Self Diagnostic Procedure and HICAS trouble codes

The system.


R32 GT-R Super Hicas specifications



OEM R32 GT-R Steering Wheel



Notice the square cut outs for the HICAS sensor.  There are two different OEM center points. Know what you have
R32 GT-R Power Steering pump. Front side is for front rack. Rear side is for HICAS rack
Rear steering rack. HICAS rack. Rear wheel steering
R32 GT-R Super HICAS electrical system diagram

How to Bleed Super Hicas without a Consult.



Aftermarket steering wheel with HICAS boss




2 comments:

Anonymous said...

Where can I get the English service manual this info came from?

Sean Morris said...

https://www.facebook.com/groups/112378145631876/files/

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