The inside wheel spin is getting worse. Don't know if because of the VLSD is going or if I'm just getting to the skill where it's time to upgrade. So questions:

How do you know if the diff is going bad?
Are there any ways to improve the OE diff without major modification (for example different fluids)?
I've seen a couple options for track diffs are they a DIY or a specilty shop install?

Thanks

-G

 

The VLSD is very much a wear item. You can try different fluids, but the VLSD is garbage....and a fluid change won't change that fact.

 

Gavin,

Time to upgrade man...

The factory VLSD is a completely sealed unit with a highly viscous fluid inside, you can not change the fluid to gain friction again......once the vlsd hits x number of miles, heat cycles, etc the fluid turns from thick to thin and doesnt provide any lsd characteristics at all........thus, now you end up with a 100 percent OPEN diff...

dont confuse that with changing the diff carrier fluid, which is OUTSIDE The vlsd sealed unit and protects the ring and pinion gear and bearings...

people with clutch diffs do motul 90pa and other fluids because clutch diffs are not compeltely sealed units......thus the many threads you read...but not so with a factory vlsd unit.

-J

 

as hard core as you are.....i would say go os giken..

-J

 

OSG without a doubt. Anyone remotely serious about track days or racing needs one. It's the best clutch style LSD on the market. As smooth as the carbon LSD's without the issues with carbon paste and bearing/shim wear. Smooth engagement on the street as well.

$1590 including shipping and motul fluid.

 

Was afraid of that. A new diff won't make it high on the upgrades list right now but it'll be placed into the same boat with a new final gear!

Whats the expected life expectancy on the clutch types?

 

You can go considerable time without a rebuild on a clutch type (30k+ miles with intermittent street/track). It should be HIGH on your priority list. It is quite possibly the single biggest upgrade aside from tires.

 

Talking to OS Giken, they told me i probably wouldn't ever need a rebuild. 15K on mine, still going strong.

 

I've just heard 30k+ spouted out so many times by other racers that I just use it as a general figure. I could certainly see the diff lasting far longer.

 

Only $1590 shipped? I may have to move it up on my list of BSP/ESP mods....

 

Comes with fluid as well.

 

Go OS Giken! Adam at Z1 took care of me when I got mine. You also cant beat their packaged rebuild kits with bearings, shims, seals, etc.

 

What tires are you spinning?

 

^If my memory serves me correctly.....Star Specs.

 

OS Giken. Hands down.


Just make sure you change your fluid every 4000 miles for street use. Less for track. My friends even go as far as draining after each event. The shavings is crazy. It's a good idea to get a Nismo finned cover to go with it.

They should last 30k without any issues. But honestly, these units still wear out pretty quick. The wear is so gradual that most people just don't notice it. Some people like worn 2 ways because they are much quieter and smoother.

 

I change mine every 20k , and OS told me it was overkill.

 

What final gear are you looking for?? might as well get an OS Giken LSD and final gear and do the swap at the same time....

Along with solid diff bushings and nismo diff cover...

I agree, i think your looking at this all wrong...the LSD should be your TOP priority......your spinning your wheels backwards on mods otherwise..

-J

 

I know its expensive, but the OSG gear oil works very well in their diff. And, as I've said before, the OSG SuperLock is the best diff out there for track use and a good LSD will help your lap times far more then any other suspension/driveline mod. If you hunt down the BetaMotorsports Facebook page you'll see an upgrade of the SuperLock clutch pack to the TCD clutch pack. Not available to the general public (yet) but it improves an already great diff.

 

There are other top priority items that are restricting my ability to track the car. This will be a top priority for upgrading the car which makes it about 4th.

 

Was Star Specs, now it's XS, but it'll be back to Start Specs after one more weekend.