TheMotoKing

I just bought a 03 350Z Grand Touring with 160K miles with new refurbished engine and tranny. Car runs good but I believe the LSD is not operating as it should. I have read that it is a viscous coupling style so there is "nothing to wear out"? If I do a donut in first gear the diff will open up within a second or two then I feel it and hear one tire roasting and the slide is interrupted. If I do this in second gear with light throttle I can keep it going for a few seconds but it eventually opens up with any more then 50% throttle.

My last car a C6 vette with OEM clutch type LSD would never break into a one wheel buzzkill. Does the Z just have a weak LSD or is mine just worn out somehow? What is the life expectancy of the OEM diff and how exactly does it wear out?

Thanks!!
Eric

terrasmak

iTrader: (8)

Life expectancy, not long. It also depends on how it is used, a new VLSD can be trash is just 2-3 roadcourse sessions.

eye-5

Bringing this old one back from the dead. Does anyone know what part to order for the stock Viscous unit? I'm pretty sure mine is toast.

travlee

iTrader: (8)

https://www.courtesyparts.com/nissan...ferential-case

but for a couple hundred more, you could get the quaife

https://www.z1motorsports.com/transm...al-p-2397.html

eye-5

Ouch, $1200. I was looking at a break down and it looked like there was a viscous coupler you can buy that is around $530. I was hoping it was that.

Yeah, I'm running in CS class for SCCA Solo. I can only do stock

travlee

iTrader: (8)

check the marketplace on here, and also here

http://www.slidegood.com/nissan/350z?part_type=231

eye-5

For my car (2007 Touring) the part number is 38420-2C500. Only around $650. Just in case someone stumbles upon this thread in the future.

travlee

iTrader: (8)

didn't know you had an hr, just assumed you had a de

terrasmak

iTrader: (8)

$575, I think I would just move classes

http://www.courtesyparts.com/nissan/...iscous-coupler

travlee

iTrader: (8)

might check this thread, see if he has what you need

https://my350z.com/forum/drivetrain/...assembled.html

eye-5

I fully understand the benefit of a good diff. Heck in my SM car I have a S15 helical currently in it and a OS Giken ready to go in.

CS has some really stiff competition in my region. We had 12 in class last Sunday with some rumblings of more next year. I like to be pushed to get better. Sometimes CS raw times STU around here. I also told myself I'd keep it street for a year to work on my driving. I tend to tinker a lot if allowed to.