One-wheel peeling. Rear bar too stiff or fried diff?

Averying · 05-16-2022, 01:20 PM

Another autocross yesterday in RI. Car felt great on the PS4S in warmer weather (~70 degrees is warm so far in New England), and new EBC yellowstuffs. I did notice a good amount of inside wheel spin (stock VLSD) on slow corner exits as I was pushing the car harder.

My car has a hotchkis rear bar on full soft, and 8k rear springs. For those that vouch for removing the rear bar, is that for less oversteer or less inside wheel spin? I’m not noticing any excess oversteer, which i know is typically the reason for taking off the rear bar. This is why I’m questioning if the problem is due to my diff overheating/already being fried.

I’ll be taking off a rear end link regardless before the next event, and hopefully that gives me more rear grip and solves this issue.

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cv129 · 05-16-2022, 01:40 PM

Stock VLSD I assume?

If so, fluid within sealed vlsd is prone to overheat. Once that happens, it’ll behave like an open diff.

Rusty has a diff cooler and diff temp gauge, he mentioned elevated diff fluid temperature even just driving around town.

Averying · 05-16-2022, 01:45 PM

Quote:

Originally Posted by cv129

Stock VLSD I assume?

If so, fluid within sealed vlsd is prone to overheat. Once that happens, it’ll behave like an open diff.

Rusty has a diff cooler and diff temp gauge, he mentioned elevated diff fluid temperature even just driving around town.

Yup stock diff. Wasn’t expecting to get any overheating on a short autocross run but I guess it’s doable!

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Spooler · 05-16-2022, 02:03 PM

Quote:

Originally Posted by Averying

Yup stock diff. Wasn’t expecting to get any overheating on a short autocross run but I guess it’s doable!

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Install an OS Giken with a diff cooler or a Wavetrac. Problem solved. The OS Giken is extremely good. Made a big difference on the Tail of the Dragon.

Rusty · 05-16-2022, 02:41 PM

Your VLSD is done.

Averying · 05-16-2022, 02:43 PM

Quote:

Originally Posted by Rusty

Your VLSD is done.

Just the good news I was hoping for! haha

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Rusty · 05-16-2022, 02:49 PM

Quote:

Originally Posted by Averying

Just the good news I was hoping for! haha

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The VLSD uses silicone fluid to operate. The fluid breaks down over time. But it breaks down quicker with heat. The more high heat cycles it goes through. The faster it breaks down. The more it breaks down. The more heat it creates. It's a vicious cycle.

Averying · 05-16-2022, 02:50 PM

Quote:

Originally Posted by Rusty

It's a VISCOUS cycle.

Fixed^

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JARblue · 05-16-2022, 04:46 PM

Quote:

Originally Posted by Averying

Yup stock diff. Wasn’t expecting to get any overheating on a short autocross run but I guess it’s doable!

Stock fluid, too? Or are you running Motul or Redline or something?

The stock fluid boils almost immediately if the car is already warmed up. The VLSD is pretty much worthless because you don't need it for casual driving and it can't handle hard driving you actually need it for

Averying · 05-16-2022, 04:48 PM

Quote:

Originally Posted by JARblue

Stock fluid, too? Or are you running Motul or Redline or something?

The stock fluid boils almost immediately if the car is already warmed up. The VLSD is pretty much worthless because you don't need it for casual driving and it can't handle hard driving you actually need it for

Nope Redline 75W90

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JARblue · 05-16-2022, 04:50 PM

Quote:

Originally Posted by Averying

Nope Redline 75W90

That's what I run. It helps some. Just delays the inevitable a bit longer.

Averying · 05-16-2022, 04:51 PM

Quote:

Originally Posted by JARblue

That's what I run. It helps a little bit. Just delays the inevitable a bit longer.

I’m thinking my diff might just be ‘tired’ due to the track use from its past life (prev owner)

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cv129 · 05-16-2022, 07:00 PM

Quote:

Originally Posted by Averying

I’m thinking my diff might just be ‘tired’ due to the track use from its past life (prev owner)

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SC’d, track use from previous owner, track use by current owner. Time for new diff mate

Averying · 05-16-2022, 07:02 PM

Quote:

Originally Posted by cv129

SC’d, track use from previous owner, track use by current owner. Time for new diff mate

And my car only has 30k miles on it… good thing the new Z has a mechanical type diff instead of this VLSD!

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Spooler · 05-17-2022, 12:10 AM

Quote:

Originally Posted by Averying

I’m thinking my diff might just be ‘tired’ due to the track use from its past life (prev owner)

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Mine was doing the one wheel peeler at 8k miles. The VLSD is just chit.

05-16-2022, 01:20 PM	#1 (permalink)
Averying Enthusiast Member Join Date: May 2018 Location: Rhode Island Posts: 478 Drives: '09 370Z, '03 G35 Rep Power: 14419	One-wheel peeling. Rear bar too stiff or fried diff? Another autocross yesterday in RI. Car felt great on the PS4S in warmer weather (~70 degrees is warm so far in New England), and new EBC yellowstuffs. I did notice a good amount of inside wheel spin (stock VLSD) on slow corner exits as I was pushing the car harder. My car has a hotchkis rear bar on full soft, and 8k rear springs. For those that vouch for removing the rear bar, is that for less oversteer or less inside wheel spin? I’m not noticing any excess oversteer, which i know is typically the reason for taking off the rear bar. This is why I’m questioning if the problem is due to my diff overheating/already being fried. I’ll be taking off a rear end link regardless before the next event, and hopefully that gives me more rear grip and solves this issue. Sent from my iPhone using Tapatalk __________________ 2009 Sport Touring \| Platinum Graphite \| GTM Stage 1 Supercharger \| BC BR Coilovers \| Hotchkis Swaybar \| Z1 FUCAs \| AME TM-02 Wheels \| Z1 2-piece Front Rotors \| Z1 Clutch & Flywheel \| Invidia Gemini Catback \| GTM Resonated Test Pipes Last edited by Averying; 05-16-2022 at 01:42 PM.

05-16-2022, 01:40 PM	#2 (permalink)
cv129 A True Z Fanatic Join Date: Jul 2011 Location: Dallas, TX Posts: 3,235 Drives: 09 Nismo, 16 Nismo Rep Power: 163995	Stock VLSD I assume? If so, fluid within sealed vlsd is prone to overheat. Once that happens, it’ll behave like an open diff. Rusty has a diff cooler and diff temp gauge, he mentioned elevated diff fluid temperature even just driving around town. JARblue likes this. __________________ Setrab \| RE-71 \| SPL \| JRZ \| Nismo \| ARK \| Whiteline \| RacingBrake \| CJM Oil Pan \| Ti shield

05-16-2022, 02:41 PM	#5 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,217 Drives: 2011 Nismo GM 6M Rep Power: 2684438	Your VLSD is done. cv129 likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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