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Originally Posted by caall99
0-15 mph: wheels turn opposite to fronts, aiding turning circle
15-55 mph: hicas does nothing
55+ mph: wheels turn with fronts, for stable highway lane changing
atleast thats what i think happens
on the highway hicas is amazing. u need very little input to the steering wheel to drive through a long sweeping bend. and it almost feels like the car rolls less. might not be true but it feels like its more planted. i enjoy it.
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you are correct except for the 0-15 part. It only does that on Hondas 4 wheel steering system and G.M.'s current 4 wheel steering system on their trucks. The Nissan 4 wheel steering system aka Super Hicas does not assist at low speed or extremely low speed i.e. in parking conditions.
The reason your turning circle is tighter is because the ratio on your front steering rack in a super hicas is a closer ratio than the the racks that come in other 240's 13:1 Hicas cars vs 17:1 non hicas cars.
none the less as far as Hicas working at higher speeds go I prefer non hicas cars. Though I do love Hicas cars front steering racks.