Having had a few runs in my Z over the past 3 weeks!

 

When I go over a bump or uneven road surface, the rear of the Z seems to " twitch" ! or wonder!! Nothing going round corners, only going straight.

 

Not all the time though, but definately there!:huh:

 

I had one of my HICAS arms replaced on the MOT only last month.

 

1991 Jap TT (nothing loose at the back by the way)!

 

Any ideas from you guys would help. Thinking rear steer HICAS playing up but how?

Could be anything from worn bushes to worn track rod ends or inner HICAS arms. You need to get the thing up in the air to have a play about.

Even the actually subframe bushes can cause wheel hop and poor launch. Hicas bushes are famous for wearing and not holding the toe angle causing it to wallop round corners and try to fish tail. It must also be mentioned when it's wet and you hammer it the diff can stuggle causing the same issue, mine has fish tailed a few times. Complete rear end change this winter anyway though.

Leaking/shagged shock can cause it too.

Sub frame bushes would be the first check I'd make.

My experience with this is my outer hicas ball joint was shagged, replaced it and all is well.

My experience with this is my outer hicas ball joint was shagged, replaced it and all is well.

 

+1

get rid of the lot its a hateful thing it really is

It's OK when it's working properly, which it often isn't. I like the way it makes the car change lanes and overtake like a jet fighter, I like the way it corrects that hint of oversteer allowing the back to step out like a pro. I hate the way it can catch you unaware as it becomes active mid corner whilst on the loud pedal, when you have already exhausted the touch of oversteer and now require opposite lock and get stuck in this cycle of fighting against the hicas leaving you snaking down the road.

Fully working on a car used for wafting around it's got it's unique niceness, for a car that gets it's throat ringed on empty a roads or sees track time it's a scarey thing that's probably broken anyway.

get rid of it its crap

It's going mate.

very good best thing. hicas should be called diecas

Love my Super Hicas :biggrin:

HICAS is brilliant when it works. Nissan didn't think the NAs needed it "the real benefits of rear-steer become apparent at over 120mph and they are happy with the handling of the regular [NA] car without it." But then again, JDM cars are limited to 112mph and they still fitted it to TTs over there.

 

I digress.

 

The most common cause of a twitchy back end is rear shocks need replacing. Both my TT and blue NA started to go twitchy over bumps on straight roads. Replace rear shocks, back to normal again. Ockham's Razor applies as normal.