vLSD stopped working - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Danio · 03-05-2003, 05:32 PM

I've been using a 96 J30 vLSD on my 98 240SX for about a year now. At the Drift Showoff event recently, a couple people noticed that my LSD wasn't working anymore (from watching the wheels and from driving). One guy suggested changing the differential oil but would that help? I thought the differential oil doesn't need to be changed often. The vLSD was working just fine a little more than a month ago at Thunderhill Raceway. Anyone know what might have gone wrong, and should I just get a better LSD?

AKADriver · 03-05-2003, 05:42 PM

Changing the diff oil won't affect the VLSD, the viscous unit is sealed off inside.

240meowth · 03-05-2003, 05:46 PM

from what i understand, the VLSD gives out and acts like a open diff after the fluid heats up to a certain point. maybe you just used it too much and it was hot...

mrdirty · 03-05-2003, 06:34 PM

Quote:

Originally posted by 240meowth
from what i understand, the VLSD gives out and acts like a open diff after the fluid heats up to a certain point. ...

I thought it was the reverse, heats up then locks

mrdirty · 03-05-2003, 06:35 PM

Quote:

Originally posted by AKADriver
Changing the diff oil won't affect the VLSD, the viscous unit is sealed off inside.

I didn't know that, how do u change the fluid then?

Dousan_PG · 03-05-2003, 07:10 PM

vlsd sucks
get a real one and you'll never regret it

AKADriver · 03-05-2003, 07:22 PM

Quote:

Originally posted by mrdirty
I didn't know that, how do u change the fluid then?

You maintain the gear oil as you would for an open diff. Same oil, same quantity AFAIK. No "LSD oil" is necessary... That's for clutch LSDs. I repeat: NO LSD OIL. I don't want to see that thread come up again, damnit. NO LSD OIL IN A VLSD.

The viscous fluid is "maintenance free"... since there isn't any metal to metal contact inside the viscous coupling, it should in theory never "go bad" like oil does...

...but it does. After a while, a lot of heat cycles, etc... it can break down. At that point the VLSD is dead, and it can't be salvaged, though it'll still work fine as an open diff, I guess.

SilviaDriver · 03-05-2003, 09:12 PM

is there any way you can tell if the VLSD is dead inside the car? besides having people look from the outside?

03-05-2003, 05:32 PM	#1
Danio Zilvia FREAK! Join Date: Oct 2001 Location: SJ Bay Area Posts: 1,002 Trader Rating: (0) Feedback Score: 0 reviews	vLSD stopped working I've been using a 96 J30 vLSD on my 98 240SX for about a year now. At the Drift Showoff event recently, a couple people noticed that my LSD wasn't working anymore (from watching the wheels and from driving). One guy suggested changing the differential oil but would that help? I thought the differential oil doesn't need to be changed often. The vLSD was working just fine a little more than a month ago at Thunderhill Raceway. Anyone know what might have gone wrong, and should I just get a better LSD?

03-05-2003, 05:46 PM	#3
240meowth Nissanaholic! Join Date: Dec 2001 Location: torrance, ca Age: 41 Posts: 2,407 Trader Rating: (4) Feedback Score: 4 reviews	from what i understand, the VLSD gives out and acts like a open diff after the fluid heats up to a certain point. maybe you just used it too much and it was hot... __________________

03-05-2003, 07:10 PM	#6
Dousan_PG Post Whore! Join Date: May 2002 Location: Orange County, California Age: 46 Posts: 16,640 Trader Rating: (23) Rides Gallery: Dousan_PG Feedback Score: 23 reviews	vlsd sucks get a real one and you'll never regret it __________________ Aaron Pink GodziRa www.geocities.com/pink_godzira

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03-05-2003, 05:42 PM	#2
AKADriver Post Whore! Join Date: May 2002 Location: Springfield, VA Age: 43 Posts: 3,517 Trader Rating: (1) Feedback Score: 1 reviews	Changing the diff oil won't affect the VLSD, the viscous unit is sealed off inside.

03-05-2003, 09:12 PM	#8
SilviaDriver Post Whore! Join Date: Jun 2002 Location: San Jose, CA Age: 40 Posts: 5,514 Trader Rating: (2) Rides Gallery: SilviaDriver Feedback Score: 2 reviews	is there any way you can tell if the VLSD is dead inside the car? besides having people look from the outside?