Diff Seems To Be "grinding" When Turning Sharply

[ClutchBurndout-:(]

hey all, i replaced my rooted diff with what i thought was a decent diff, and turns out that its acting up, i have no idea why it does it, but when i turn sharply, like when im taking off and turning sharply at the same time, the diff grinds and feels horrible, this is the only time it does it, so im thinking that it isnt slipping properly? from my understanding the lsd will slip under X torque to allow the wheels to spin differently, i filled the gearbox with LIMSLIP 90 penrite oil right to the filler hole.

any ideas on what its doing and how to fix it? (preferably oil based fixes )

cheers

[lowbro]

I have a Cusco 1.5MZ which was installed 2 wks ago as a replacement for my R34GTT OEM diff.

I am experiencing simliar type problems when in low rev range 1st, 2nd gear, tight turns, I experience a thump from the diff end, feels like it is rolling over inside itself in the diff housing.

I initially had Redline 75-90w shockproof lightweight oil in their one week ago, this weekend I changed to Royal Purple 85-140w with the additive, and I thought for the first hour of driving it felt so much better, until I did a tight turn and then the diff felt like it rolled over inside itself again and gave an almight thump sound. Now it does it more constatly. But when driving at speed it is silent and feels great and operates as it should.

I am also getting a lot of hard clunking from my shaft at low rev range gear change engaging the diff, but it is a 1 piece and I am trying to change back to 2 piece. I am wondering if the whole drivetrain needs to be adjusted to make everything a lot tighter for normal operation.

From my experience so far it is not your oil, it is your drive line that is the issue, prob needs to be tuned accordingly for correct operation if that is even possible.

What are other people views on this?

[wlspn]

hey all, i replaced my rooted diff with what i thought was a decent diff, and turns out that its acting up, i have no idea why it does it, but when i turn sharply, like when im taking off and turning sharply at the same time, the diff grinds and feels horrible, this is the only time it does it, so im thinking that it isnt slipping properly? from my understanding the lsd will slip under X torque to allow the wheels to spin differently, i filled the gearbox with LIMSLIP 90 penrite oil right to the filler hole.

any ideas on what its doing and how to fix it? (preferably oil based fixes )

cheers

Did you replace the whole diff, housings & all? Or just fit an LSD centre in your own housing?

If centre only, who done the work?

Also what type of diff? Assuming it is a mechanical LSD type but 1-way, 1.5-way, 2-way? What manufacturer, etc?

[ClutchBurndout-:(]

Did you replace the whole diff, housings & all? Or just fit an LSD centre in your own housing?

If centre only, who done the work?

Also what type of diff? Assuming it is a mechanical LSD type but 1-way, 1.5-way, 2-way? What manufacturer, etc?

it was a straight swap, the whole housing, with what im pretty sure is the exact same diff, from nissan, im not sure on what sort of diff it is, all i know is its an LSD but i assume that all r33 S1 GTST's have the same, i tried to figure it out but cant find the info anywhere

[wlspn]

OK, first of all, if you have fitted a standard R33 GTST diff, although it's LSD, it is viscous, not mechanical LSD.

This means it uses a viscous (fluid) coupling to limit slip, rather than clutch-packs, etc like a mechanical LSD does.

With a viscous LSD I would not use specific LSD oil as that is meant for mech LSDs with clutch-packs, etc. Would just use a general 80w90 gear oil.

You are right in assuming that with a standard diff the wheels should be free to move at different speeds at low load, low torque.

Can you better describe the noise or feeling it's making? The more info, the easier to diagnose...

[ClutchBurndout-:(]

ok, should i look into changing the oil?

its not so much a noise that you hear, but a feeling in the car, when turning, although the car still moves it feels like the diff is grinding something inside and feels VERY metal on metal inside the diff, it makes the car a bit hesitant to move, aka the car jutters slightly as you move