Hicas Description

[anexiole]

hi guys

i searched around wondering what does HICAS do buy all i found were

- sale of HICAS

-trouble shooting HICAS

but nothing much on describing what HICAS is.I don't know anything about HICAS.Could anyone please have a description about it? thank you

[chaos]

all 4 wheels steer from what i understand.

rear wheels dont move majorly though just a fraction

[Big Rizza]

I'm pretty sure HICAS works by either steering the rear wheels out of phase with the fronts to sharpen turn in response at low speeds, or in phase to reduce understeer at high speeds. They don't turn much, only a couple of degrees, but you can definitely feel the rear end moving around with the HICAS working.

Edited November 8, 2005 by Big Rizza

[Daniel_]

Big Rizza is right, it uses a combination of steering wheel angle, speed and lateral force sensors to determine the angle to set the back wheels to.

Aswell as making turning response sharper is also tries to correct oversteer, the best example of this I've seen is the gtr special top gear did. Clarkson had a big drift going and as soon as he went to correct it you could see the rear snap into place, looked cool and great for normal driving but you can see why people use lock bars

[LBR33]

Here is a pic of what it does

[POOMBAH]

^^^just to clear up any misunderstandings some people might have...

That would be the Super HICAS off a gtr

HICAS found on gtst's work on the same principle, but only the rear wheels move as opposed to all four with super hicas.

[anexiole]

Arigato!

Very very sufficient explaination you guys!!

[Links]

Whered you get that great pic from lbfalcon??

Poombah.. HICAS found on gtst's work on the same principle, but only the rear wheels move as opposed to all four with super hicas.

Think about what you said - of course all 4 move, the front 2 are controlled by you.. the back 2 by HICAS, the main difference is the number of degrees that the rear wheels move - super hicas is up to +/-1 degree I think, vs normal hicas is only +/-0.5degrees

[Bass Junky]

Links.

They can move more than 1 degree.

I think it's more like 1.5 degree normally. The R34 can do a little dance when you reset the hicas, and it moves much more than 2 degrees when it's reseting itself.

[Links]

^^ fair enough than - wasn't quite sure of the exact amounts.. it's in the service manuals I believe, the S-Hicas moves almost 2x as much as normal Hicas..

[funkymonkey]

hehe the pic was one that I posted of the translation I did of the Super HICAS system which comes in R33 GTSt's. The original image came out of the R33 GTSt sales brochure.

[09ONE_32]

Big Rizza is right, it uses a combination of steering wheel angle, speed and lateral force sensors to determine the angle to set the back wheels to.

Aswell as making turning response sharper is also tries to correct oversteer, the best example of this I've seen is the gtr special top gear did. Clarkson had a big drift going and as soon as he went to correct it you could see the rear snap into place, looked cool and great for normal driving but you can see why people use lock bars

<{POST_SNAPBACK}>

I was under the impression that, the particular event where Clarkson had the drift going was at relatively low speed exiting a second gear corner at full throttle. I thought he was demonstrating the ATTESSA system, and he was holding the drift in second gear out of the corner until the front gripped and immediately straightened him up. I have only seen the clip once on T.V ages ago before I even had my learners, that was all I remember.

[POOMBAH]

Poombah.. HICAS found on gtst's work on the same principle, but only the rear wheels move as opposed to all four with super hicas.

Think about what you said - of course all 4 move, the front 2 are controlled by you.. the back 2 by HICAS, the main difference is the number of degrees that the rear wheels move - super hicas is up to +/-1 degree I think, vs normal hicas is only +/-0.5degrees

<{POST_SNAPBACK}>

My bad. Should've elaborated more...

I know what you said but what I meant with 'same principle' is that they both steer wheels to adjust the car

[POOMBAH]

hehe the pic was one that I posted of the translation I did of the Super HICAS system which comes in R33 GTSt's. The original image came out of the R33 GTSt sales brochure.

<{POST_SNAPBACK}>

So you're saying T's came with S-hicas also? If so, then I should've looked a little harder when buying my car

[Redback]

ts dont come with s-hicas...... just plain hicas.... what would be the advantage of a GTR then...? other then the obvious.

[funkymonkey]

Well... its in the brochure... unless Nissan made a typo.

[Scribble]

Now if it's so good why do people get rid of it? i understand the points of the rack having a bit of free play. What if this is corrected and the rack is tight as a nun?

Or is there other reasons why you guys dont like it?

[funkymonkey]

If you think of a Skyline as what its supposed to be... ie a sporty passenger car, then HICAS is awesome. If you take a corner too fast it kicks in and helps you keep the car in control and back on line.

If you're a fully sick drifter or die hard trackday warrior, then HICAS is like going on a date with a hot chick and having your mom run upto your car to give you a scarf so you don't catch a cold... ie... nice thought, but totally useless. You want to control your car one way, and HICAS wants to help so it makes your car go the other way.

[SKY 34]

HICAS<-- four wheel steering and ATESSA <--- four wheel drive?

I'm getting confused..I always had the impression that ATESSA is four wheel steering

[funkymonkey]

ATTESA stands for "Advanced Total Traction Engineering System for All Electronic Torque Split" = torque distribution

HICAS stands for "High Capacity Active Steering" = steering