Is VLSD in Sport Package really useful ?

Rusty · 06-01-2017, 08:29 PM

Quote:

Originally Posted by osbornsm

So you're sayin my VLSD @ 80,000 miles and 10 track days is prolly not LSD-ing anymore?

Mine goes south after about 10 to 15 minutes on the track. After it cools, it will come back.

Rusty · 06-01-2017, 08:32 PM

Quote:

Originally Posted by Chan Chee Hoe

Time to upgrade to Cusco LSD.

Wavetrac for DD, and track. The more track time. Then Cusco or OS Gekin, which you can tune.

Jsolo · 06-02-2017, 10:49 AM

I wonder if this can be a warrantied item if one has an extended warranty? Without doing a burnout where there's only one tire mark, how else does one check lsd operation?

Rusty · 06-02-2017, 10:58 AM

Quote:

Originally Posted by Jsolo

I wonder if this can be a warrantied item if one has an extended warranty? Without doing a burnout where there's only one tire mark, how else does one check lsd operation?

Good question. Wonder what the dealer does.

YzGyz · 06-02-2017, 04:01 PM

Umm.. am I reading this correctly? You guys are saying that the vlsd is only as good as the vlsd oil inside. Even if you change the oil for the vlsd, it is still toasted after 60k miles? This is because the vlsd and the oil in the pumpkin is separate from the vlsd? I have open my diff cover 2x. I never seen any separate oil inside. I'm no expert or anything like that but I'm 99% sure that changing the diff fluid is all that is needed to maintain the vlsd.

YzGyz

Rusty · 06-02-2017, 04:36 PM

The VLSD fluid is silicone based. It it inside the ring gear carrier. Which is a sealed unit. There for separate from the gear lube. Changing the gear lube will have no effect on the silicone fluid in the ring gear carrier. The only way to change the silicone fluid is to get the whole ring gear carrier, because it is a factory sealed unit. So if you are going to do that. You should just go with an aftermarket LSD which is cheaper. Unless you find a factory VLSD on flea-bay. Most of these are toast to begin with. What happens is the silicone fluid breaks down over a period of time. Trackdays SPEED up the process. If you are into

. It will break down quicker then say normal sane DD.

felix0121 · 06-02-2017, 07:36 PM

Quote:

Originally Posted by YzGyz

Umm.. am I reading this correctly? You guys are saying that the vlsd is only as good as the vlsd oil inside. Even if you change the oil for the vlsd, it is still toasted after 60k miles? This is because the vlsd and the oil in the pumpkin is separate from the vlsd? I have open my diff cover 2x. I never seen any separate oil inside. I'm no expert or anything like that but I'm 99% sure that changing the diff fluid is all that is needed to maintain the vlsd.

YzGyz

I wonder it too.

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ChopsZ · 06-02-2017, 09:07 PM

One of many reasons why I bought a base model Z. Even when new, the VLSD is basically useless (open) after it heats up. Why pay extra for something like that?

When the time comes, I'll get the Tomei 1.5 way LSD, and upgrade to the 3.90 ring as well just for a little added "oomph".

YzGyz · 06-03-2017, 12:00 AM

Ahh, I see.

YzGyz

Z_ealot · 06-03-2017, 12:04 AM

OP you don't have to wonder, Rusty just explained it to both you and yzgyz

Jhill · 06-03-2017, 01:11 AM

Well I know the vsld doesn't engage after heat up but I'm not really sure it wears out? From my understanding (zero vlsd experience but enough corvette clutch type) the vlsd works similar to something like a AT torque converter (without a TCC luck up clutch). Really no moving/ friction parts to wear and silicon fluid can take a ton of heat cycles. I'll trust others who've experienced it fail but I was just planning to get a z1/ nismo diff cover to help keep it cooler longer (not competitive enough to buy a Gilken).

felix0121 · 06-03-2017, 02:51 AM

Quote:

Originally Posted by Z_ealot

OP you don't have to wonder, Rusty just explained it to both you and yzgyz

I read it after my posting. Thanks.

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Rusty · 06-03-2017, 03:01 AM

Quote:

Originally Posted by Jhill

Well I know the vsld doesn't engage after heat up but I'm not really sure it wears out? From my understanding (zero vlsd experience but enough corvette clutch type) the vlsd works similar to something like a AT torque converter (without a TCC luck up clutch). Really no moving/ friction parts to wear and silicon fluid can take a ton of heat cycles. I'll trust others who've experienced it fail but I was just planning to get a z1/ nismo diff cover to help keep it cooler longer (not competitive enough to buy a Gilken).

When new, the silicone fluid is thick. As it heats up. It becomes thinner. That's why during a track session. People noticing it going away. After cooling off. It comes back Now after so many miles. The fluid becomes thinner as it wears. That's why you read about people noticing the change in it's action. Once it wears, it doesn't come back.

Jhill · 06-03-2017, 06:52 PM

Quote:

Originally Posted by Rusty

When new, the silicone fluid is thick. As it heats up. It becomes thinner. That's why during a track session. People noticing it going away. After cooling off. It comes back Now after so many miles. The fluid becomes thinner as it wears. That's why you read about people noticing the change in it's action. Once it wears, it doesn't come back.

I grasp the concept I'm just surprised the fluid breaks down so quick with no real debris exposure etc. not doubting it just surprising. Sucks I guess one more thing to plan on buying down the road, probably do a quaif/wavetrace type.

cloudofevil · 06-03-2017, 08:19 PM

Quote:

Originally Posted by Jhill

I grasp the concept I'm just surprised the fluid breaks down so quick with no real debris exposure etc.

It's a polymer so mechanical shearing and heat will break down the polymer chains over time.

06-02-2017, 10:49 AM	#18 (permalink)
Jsolo Track Member Join Date: Dec 2011 Location: chicago Posts: 783 Drives: '12 G37 6MT Rep Power: 14	I wonder if this can be a warrantied item if one has an extended warranty? Without doing a burnout where there's only one tire mark, how else does one check lsd operation? __________________ G37S Sedan 6MT, Eibach swaybars, Invidia Exhaust, Weaker Clutch Pedal Spring For sale links

06-02-2017, 04:01 PM	#20 (permalink)
YzGyz A True Z Fanatic Join Date: Jun 2013 Location: Houston Posts: 1,449 Drives: 2010 Nismo Rep Power: 62	Umm.. am I reading this correctly? You guys are saying that the vlsd is only as good as the vlsd oil inside. Even if you change the oil for the vlsd, it is still toasted after 60k miles? This is because the vlsd and the oil in the pumpkin is separate from the vlsd? I have open my diff cover 2x. I never seen any separate oil inside. I'm no expert or anything like that but I'm 99% sure that changing the diff fluid is all that is needed to maintain the vlsd. YzGyz __________________ http://www.the370z.com/members-370z-...gyzs-turn.html YzGyz

06-02-2017, 04:36 PM	#21 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,864 Drives: 2011 Nismo GM 6M Rep Power: 2684436	The VLSD fluid is silicone based. It it inside the ring gear carrier. Which is a sealed unit. There for separate from the gear lube. Changing the gear lube will have no effect on the silicone fluid in the ring gear carrier. The only way to change the silicone fluid is to get the whole ring gear carrier, because it is a factory sealed unit. So if you are going to do that. You should just go with an aftermarket LSD which is cheaper. Unless you find a factory VLSD on flea-bay. Most of these are toast to begin with. What happens is the silicone fluid breaks down over a period of time. Trackdays SPEED up the process. If you are into . It will break down quicker then say normal sane DD. Z_ealot likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

06-02-2017, 09:07 PM	#23 (permalink)
ChopsZ Track Member Join Date: May 2016 Location: Central Florida Age: 48 Posts: 965 Drives: 2016 370Z GM 6MT Rep Power: 2300	One of many reasons why I bought a base model Z. Even when new, the VLSD is basically useless (open) after it heats up. Why pay extra for something like that? When the time comes, I'll get the Tomei 1.5 way LSD, and upgrade to the 3.90 ring as well just for a little added "oomph". __________________ She's For Sale! PERFORMANCE: Aero Workz \| Akebono \| BC Racing \| EcuTek \| HKS \| MaxBore \| Motordyne \| Nismo \| RJM \| SPL \| StopTech \| Z1 AUDIO: Arc Audio \| Bazooka \| Helix \| Pioneer \| Stereo Integrity

06-03-2017, 12:00 AM	#24 (permalink)
YzGyz A True Z Fanatic Join Date: Jun 2013 Location: Houston Posts: 1,449 Drives: 2010 Nismo Rep Power: 62	Ahh, I see. YzGyz __________________ http://www.the370z.com/members-370z-...gyzs-turn.html YzGyz

06-03-2017, 12:04 AM	#25 (permalink)
Z_ealot A True Z Fanatic Join Date: Sep 2010 Location: Albuquerque, NM Posts: 2,044 Drives: 09 370Z Touring/Sprt Rep Power: 10090	OP you don't have to wonder, Rusty just explained it to both you and yzgyz Rusty likes this.

06-03-2017, 01:11 AM	#26 (permalink)
Jhill Track Member Join Date: Mar 2016 Location: San jose Posts: 846 Drives: 2013 370z sport Rep Power: 3384	Well I know the vsld doesn't engage after heat up but I'm not really sure it wears out? From my understanding (zero vlsd experience but enough corvette clutch type) the vlsd works similar to something like a AT torque converter (without a TCC luck up clutch). Really no moving/ friction parts to wear and silicon fluid can take a ton of heat cycles. I'll trust others who've experienced it fail but I was just planning to get a z1/ nismo diff cover to help keep it cooler longer (not competitive enough to buy a Gilken).

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