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Diff ratio change and 2-Way LSD installed

9 posts in this topic

Posted · Report post

So, I now have a spare diff as I have been building-up a 4.08:1 with KAAZ 2-way diff for the past couple of months and it went into the car yesterday.

 

Car is transformed from the Quaife ATB and 3.7:1 OEM ratio, which is now back on the shelf (it might get new bearings and seals as it has a fair bit of backlash now).

 

The new LSD is "a lot" more noisy ... squeaks/groans and bangs on transition to trailing throttle with the tiniest steering input in the car and heaps more electronic intervention when turning with steady throttle, but the hairpin when entering the Eastern Freeway from Hoddle St northbound is just brilliant (with VDC all the way off and about 50-60 percent throttle) ... the car rolls into slight oversteer, takes a set and just powers away.

 

I'm off the Philip Island on Sun week to give it a proper spanking as the public highway is no place to extend the car properly.  We'll see how it really goes then.

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Posted · Report post

Awesome - I think the Quaife ATB is a great daily option but at the track the clutch pack LSD's are hard core

 

I am also building up a second diff, Cusco RS and 4:08

The car already has a Cusco RS (stock ratio) and the noise/banging/clunking is not bad - due to the springs in the Cusco LSD

On 90 deg left corners you do get a chirp out of the inside rear wheel - as I've set it to 80% lock up

When reverse parking there certainly are noises

 

Previously I had a (stuffed) Tomei LSD - the mechanical noises coming out of that were frightening

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Posted · Report post

Hi RB, I would like to hear your thoughts on your new diff ratio after P.I.?

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Posted · Report post

I have just had a newly rebuilt  diff installed inc bearings and seals, with Cusco RS1.5 LSD and 4.08 gears, Nismo finned diff cover and Whitline bushings.

Have had the first 800Km oil change on it but still running it in.

Love the extra controlled grip and acceleration and yes it's clunky but getting better with use.

Revzone in Melbourne did the work on it which has been excellent.  :roadrage:

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Posted · Report post

how much did it cost you including install?

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Posted · Report post

yep i got 4.08 final drive and its soooo nice

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Posted · Report post

I installed the 4.08 final drive too. Works really well with my 1.5w and nismo finned diff cooler. I also replaced the bushings for SPL.

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Posted · Report post

Where is everyone buying their 4.08 final drives from?  I'd like to buy in Aus to avoid shipping cost from the states. 

Also wondering if the centres are the same as in an S or R chassis? I.e. r200

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Posted · Report post

Z34 diff is R200 short nose .......... I did not find a set of gears I could purchase here, purchased mine from Z1 MotorSports in the YewSay. 

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