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R34 Gtt - Cuscomz 1.5 - Too Harsh For Street?

lowbro
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lowbro Community Regular

lowbro

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Hi All,

Wondering if anyone out there can offer some input or experience with my current dilema: Since installing a 'Cusco MZ 1.5 Way' centre my ride has become very harsh, mostly because of the diff when at low speeds/cornering/parking/angles etc. Recently the clutch plates of the diff have been re-ordered to decrease the v-ramp steepness, this change has not really decreased the harshness at low speed operation at all.

My current set up:

R34 GTT Sedan

Cusco MZ 1.5 with 140w oil+LSD Additive

Subframe bushes have just been replaced with noltec and also changed to uprated diff bushings

Rear bushings are all whiteline offsets with factory control arms

TEIN SS's coilovers

I am wondering, what can be done to eliminate the harsh movement/pinking noises that I am experiencing in the rear end of the suspension (subframe/diff/shocks etc)

Would the TEIN SS's be just too soft in terms of spring rate and thus allowing too much movement with the operation of the LSD, should I go solid diff busings and even solid subframe bushings?

BTW - Removal of the subframe is a real pain ITA, but more labour intensive than hard, so I want this to be the last time I have to take it out :(

Yes my diff centre is suited a lot more for track usage, but to have both wheels fire up on tap when needed is truly AWESOME!

So I am wondering if anyone out there has a similair set up in their street car, have experienced my dilema and have had any success with alterations or fine tuning of their setups?

Don't really want to go back to stock VLSD :worship: this would be taming the BEAST!

GTScotT Grand Master

GTScotT

Posted
Posted

I prefer to use NEO oils in all cases, the NEO gear oil requires an additive to fine tune the LSD slip amount when used with any LSD application. The oil itself makes for a very harsh LSD experience.

Perhaps the oil you are using is similar, maybe you can try changing the oil or try an additive. Maybe try mix 1 part dextron into 2 part of gear oil (30ish%) and see if they frees it up a touch.

lowbro Community Regular

lowbro

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Posted

I have been using the PENRITE 140w with the 150ml additive Total $32

I have experimented with many oil types but sticking with the 140w, never the NEO oil though? at this weight they should be fairly similair I would expect in operation?

My mixture would be (diff takes 1.2 ltr's a oil) top up 1 ltr of 140w with all the additive (150ml) and fill diff, add more 140w to get the level to the filler hole so 85/15%ish mixture.

NYTSKY Grand Master

NYTSKY

Posted
Posted

I have a Tomei 2 way in my car and its very nice to drive with. No real harshness and only a slight clunk here and there at low speeds.

Oil is a BIG factor when it comes to diffs like these. Id suggest talking with a gearbox/diff place and see

what they recommend.

For example after a weekend of hard track work i was driving the car home and it felt like the diff was about to come out of the casing, back end was wandering all over the road. Took it my gearbox/place and they changed the oil.

From memory the stuff they use is pretty good, oil and additive alone was $85, but worth every penny.

Felt like a brand new diff again :)

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