Another diff question
 

So trying to find a good diff shop near me is a lot harder then I thought. Since I know I won't have the money for a proper diff cooler but need a LSD, what are the cons to going with a quaifee diff over a cusco? I know I would rather have the cusco but since I don't have the parts or knowledge to service if and no local shop that will be able too, would it be better to go with one that won't need work eventually. I have heard that on the quaife, of the right tire slips, the diff won't work. Is this true? Trying to get the most info before I bite the bullet. I do autox more then HST events

Proper diff cooler? Just buy all the fittings and save $900 over the same thing from gtm.

If you can't find anyone, I'd just ship it.

big disadvantage is the Quaife will open up past a certain point of weight transfer, similar to the stock VLSD but not as bad. it is very durable since its all gears internally, just performance wise it has its limitations

How does the OS Giken compare? I'm looking to get a diff as well, and I'm torn between the Quaife or dropping the extra $600 for the OS Gilken


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the OS giken, Cusco RS and MZ, Kaaz, and the Nismo GT LSD are all clutch type differentials, so by design they will not open up even if the inside wheel is off the ground. Clutch type LSD's though usually require setup and tuning for optimum performance for a specific usage (1.5 way or 2 way, what percent lock up, lock engagement ramp up Etc) and also use LSD specific fluids. A helical(or torsen) style LSD like the Quaife is a gear operated differential, and its bias characteristics and engagement isnt tunable but is very smooth and doesnt require special fluid to work correctly. but my design they have a weakness in the sense if the inside wheel doesnt have enough grip, it will open up. but its very user friendly and a "set it and forget it" kinda LSD, just doesnt have the performance potential as Clutch types

Thanks for the info, very helpful


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I have been doing a lot of reading trying learn about the different kind of diffs, still not sure what route I am going but I have a few months to decide. From what I have been reading the new Quaife has a preload spring that prevents it going open if a wheel comes off the ground. I like how they don't require the maintenance and are not as susceptible to heat like a clutch type but of course they are not adjustable. I know a couple guys love having a Torsen style diff for Autox since its a lot of low speed corners but I have zero experience with either. Just the VLSD that was in my 350

sounds like it similar design to a wave track, but feel and lock it still doesnt compare to a properly setup clutch type. Id tried alot of different diffs on different drivetrains and i still like a traditional, well setup clutch type.

Clutch type LSDs arent ny weaker to heat then torsen, but by design clutch types do produce more heat by function, i have my clutch plates WPC treated to reduce heat and smooth operation.

For Auto X id prefer a clutch type even more since the low speed corners a torsen is more likely to open up

How much was it to have the clutches WPC treated?

less then $200, operation is much smoother/quieter and doesnt run as hot

That's cheaper then I thought. I finally found a good diff shop in my area so thankfully that hurtle is cleared. Have you had to rebuild the cluchtes yet? I have heard people needing to do it anywhere from 5K-30K miles but nothing specific to the Z or the Cusco.

nope, ive had my LSD in for about a year now. ive put prolly 20k miles on the car and about 7 tracks days on the LSD. About to go to the track again this weekend

Ive been part of my350z dot com since like 2006 and I havent heard anybody having to rebuilt them maybe 1 or 2 that decide to do it but its has been extremely rare.
This has been a very popular LSD on that plaform and a lot are well over 50 000miles and havent got them rebuilt and still lock very good.

I have a nismo lsd pro already WPC treated with 20 miles on it if that... essentially new. if your interested PM me.