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R34 Rear end Floating/steering at high speed

R31/4 GTT/S
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R31/4 GTT/S Enthusiast

R31/4 GTT/S

Posted
Posted

Help my R34 GTT is suffering pretty bad Bump steer/Floating at high speed (100 k's)

I recently changed my right rear wheel bearing thinking it was my problem but the issue persists. 
Example. Around 80 km/hr car feels fine. But when I get on the monash and reach 100 k's /hr if I hit any sort of bump pot hole the rear end floats to the side for a second and seems to mainly favour the rear floating to the left. It really don't feel good. 
Can anyone tell me
What's going on??
The suspension only has very slightly lower springs otherwise all else is standard. 
All help is much appreciated. 
Thanks guys 
Ash

GTSBoy Grand Master

GTSBoy

Posted
Posted
9 hours ago, R31/4 GTT/S said:

In saying that the rear wheels are wearing out slightly more on the inside than the rest of The tyre. 

This is a reasonable sign that your rear toe is not in control and does point to HICAS joints.  But that's only so long as you don't have excessive camber at the rear.

mikel Community Regular

mikel

Posted
Posted

Many install a HICAS lock bar, but if your ends are worn you may need to replace them 1st (I did mine 10 years ago and don't remember how it all went together)
Having a computer decide where to point the rear wheels isn't great IMO
HICAS is short for the computer saying "Help I Can't Actually Steer"

Mike

  • Like 1
Dale FZ1 Veteran

Dale FZ1

Posted
Posted
On ‎10‎/‎25‎/‎2017 at 3:36 AM, R31/4 GTT/S said:

 

The suspension only has very slightly lower springs otherwise all else is standard. 
 

How much lower is the ride height?  Post up a pic of the car.

And confirming no aftermarket suspension arms in the rear?

HICAS is still fitted, or removed?

R31/4 GTT/S Enthusiast

R31/4 GTT/S

Posted
  • Author
Posted

I'll try get a pic of the ride hight up. But it's not that much lower than other standard 34's. 

Im assuming this caused the pre mature wear on my wheel bearing which was completely destroyed when I pulled the hub apart. 

Does anyone know a part number for the hicas bits that I would need to change?

cheers

ash

R31/4 GTT/S Enthusiast

R31/4 GTT/S

Posted
  • Author
Posted

Sorry for the Heap of Pics people.
But the first one shows the ride hight.
The second/third one shows where the hicas meets the hub.
Can Anyone please see where I have the problem.
It's driving my crazy. Driving at 100kl/hr and
Suddenly hit a bump. MORE on the left the car steers off and it's frieking scary.
PLEASE HELP

GeeDog Experienced

GeeDog

Posted
Posted (edited)

Jack up the rear end, so the wheels are off the ground. Hold one rear wheel at the 3 & 9 o'clock positions, and try and move it. If there is free play (ie you can make the wheel "steer"), get someone to move the wheel while you look & feel for where the play is. It is likely in the outer ball joints (where the Hicas tie-rods / steering arms join the wheel hub), but may also be in the inner tie-rod end - the joint inside the rubber boot where the tie-rods come out of the Hicas rack. 

I've just fixed this on my R33 by replacing the Hicas lock bar & tie-rods / ball joints with a Hicas eliminator kit. You have the Hicas rack rather than the lock bar, but the same tie-rods & ball joints.

20171103_124555a.thumb.jpg.d996b5679b171cb59110c395e83259a5.jpg 

Old Hicas lock bar with tie-rods

 

20171103_115459.thumb.jpg.19bdbf3de01e261b0c93ecb4f96e63ea.jpg

The remains of the old ball joints

20171103_124235a.thumb.jpg.94db1dc6ba590a7b12e5db49b4938b53.jpg

Eliminator kit installed

Edited by GeeDog
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