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Help: Diff Problem!

ix9
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ix9 Grand Master

ix9

Posted
Posted

I've noticed this for a while now, when putting the power down around a corner, the car would rev a touch higher and would jerk around. I am not breaking traction, nor am I going sideways.

It almost feels like the clutch is slipping, but I've had that replaced about 1000km's ago with a ceramic plate jobbie, that fixed up old mr slippery-launch!

Now when driving, changing lanes while putting the power down, the car flicks-back into the other lane quickly, almost like I'm recovering from traction loss.... But i'm not.

I put the car up on jacks (the entire rear-end) and noticed how the wheels spinned when i turned them manually.

I can turn the wheels in any direction and the other wheel will follow suit SLOWER. I can also hold back one wheel while I turn the other. The drive shaft is still turning when I hold one wheel back.

It is obviously a touch stiffer when I hold one wheel back, but I can still turn it. I thought an LSD was supposed to force each wheel to turn the same etc ? and you can't hold it back ? (can you?)

I've recently replaced diff oil with Castrol LSX90 (the best stuff for LSDs apparently)

What is happening ?

What usually wears out on a diff to make this happen ?

How can it be fixed ? Can I just take it to a Differential specialist and tell him to weld it locked ?

Cheers Guys,

-Kym.

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Sumo Mentor

Sumo

Posted
Posted

mine does the same, im not to sure what it is... just how it feels like your flicking the arse end out but u haven't broken traction in the first place. I have a feeling that it was something to do with the 4 wheel steer. Thats a guess, but thats what I was pointing towards

Sumo

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G0DF4Th3R Grand Master

G0DF4Th3R

Posted
Posted

hah kym i have the same problem i think

well mine - the car kinda 'wanders' when i change lanes

think of it as high winds blowing the car and you can feel it slightly swerving in a way

sorry im not good at explaining

however, i wanna get rid of HICAS as problem is definately caused by it (HICAS warning light comes on regularly)

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Guest Boxhead

Guest Boxhead

Posted
Posted

from what i know, if your doing one wheel burnouts, its a open diff, which either means thats what it is in your car, which is un likely, or your lsd is going bye bye, myn gives bad feedback, makes horrible clicking noises, and chooses when it wants to do 2 wheel burn outs, ive been told it is on its way out, and some say its the way it is.. ohwell.. if anyone knows were to source cheap GOOD diffs, sing out

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gtrken Grand Master

gtrken

Posted
Posted

afaik the R33 GTST has a viscous LSD , not a mechanical as per a GTR.

Viscous relies on silicon gel to heat up caused by a different turning rate in the axles.

If the diff is a bit old , this may take time to react if it does at all.

The waving or lane changing is more related to w/alignment , tyre pressures , shot tyres or slack bushings.

What you have to realise is the hicas works in the same direction as the front wheels above 60kmh ( or so ) and only move by 1 or 2 deg anyway.

Cheers

Ken

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