viscous slip differential

370Zsteve · 11-27-2009, 09:56 AM

Quote:

Originally Posted by ChrisSlicks

All modern automatic transmissions have this. Both the transmission and engine are computer controlled, by synchronizing the 2 the torque converter can be put into lock up mode more quickly making the car feel more responsive/connected.

Is this true?

ChrisSlicks · 11-27-2009, 11:35 AM

Quote:

Originally Posted by 370Zsteve

Is this true?

Okay, maybe not all, but lets say most. Every new vehicle I've driven in the last 2 years from Ford, Chevy, Nissan and Toyota that has a manumatic mode has had this. Some work better than others but they all seem to have it in one form or another.

Red370 · 11-27-2009, 02:07 PM

Quote:

Originally Posted by ChrisSlicks

3 reasons.

Viscous units have better street manors because the slip ratio is high and they are silent.

Viscous units don't wear out with street driving, gear and clutch units eventually require a rebuild.

Viscous units are cheaper, an important point when your building a car for a $30K price point.

What he said. Basically its Nissans way of adding an LSD without driving the cost up and keeping the ride comfortable.

Lug · 11-27-2009, 06:05 PM

Quote:

Originally Posted by GTRFAN

Why would Nissan put a useless viscous LSD in the Z range when nearly all previous models have had mechanical LSD's? S13, RPS13, S14, S15, R32, R33, R34, R35 ...

The 350Z had an VLSD.

zellsexy · 11-28-2009, 05:23 AM

ok so the sports package is worth it lol, would it be worth changing the flywheel to a lighter one on a automatic? lol

GTRFAN · 11-29-2009, 09:47 PM

Quote:

Originally Posted by ChrisSlicks

3 reasons.

Viscous units have better street manors because the slip ratio is high and they are silent.

An LSD is all about performance, not quietness and comfort. This is meant to be a sports car not a sofa on wheels.

Quote:

Originally Posted by ChrisSlicks

Viscous units don't wear out with street driving, gear and clutch units eventually require a rebuild.

Viscous units do wear out and become totally useless open diffs. Mechanical units perform at spec for much longer and particularly don't suffer immediate failure at high temps.

Quote:

Originally Posted by ChrisSlicks

Viscous units are cheaper, an important point when your building a car for a $30K price point.

Totally disagree about the cost angle. I think it's becuase the Z is NA and not turbo like a Silvia.

Quote:

Originally Posted by Lug

The 350Z had an VLSD.

That's why it's not on my list of models that had a mechanical LSD.

Apologies for the rant...I just can't understand why Nissan only put real LSD’s in the turbo models and not the NA ones.

ChrisSlicks · 11-30-2009, 09:13 AM

Quote:

Originally Posted by escalade2346

i was wondering same about the lsd, but does any one kno if any aftermarket lsd will fit in a 370z without the sport package

Apparently it needs an extra "kit" to add the side shafts, but other than that it will fit.

needr6parts · 12-25-2009, 09:21 PM

Quote:

Originally Posted by 370Zsteve

House closing today at 10am. Barring any unforeseen issues, I should have $$$$ in my bank account later today or tom'w.

i have a base without it and i have never had just one wheel spin even with 2 people in the car .I think all have limited slip the sport package is just a little beefier setup.

Zsteve · 12-25-2009, 11:40 PM

Quote:

Originally Posted by needr6parts

i have a base without it and i have never had just one wheel spin even with 2 people in the car .I think all have limited slip the sport package is just a little beefier setup.

??????? Dont think so, if all had it they would market it that way as it would sound better.

What I would like to kow is: if I put in a LSD like quaife, will I feel a harshnes in its driving and noise from it? And would it help times for 0 60 and 1/4 mile?

travisjb · 12-26-2009, 02:28 AM

The vlsd is no good for the track (track with turns!)... it craps out and becomes effectively an open diff after a few intense laps... IMO you won't need an LSD for 1/4 mile unless you are driving on a crap track with unequal traction for left/right tires

OP, get the sport package if you want the SRM option

I have the Carbonetic clutch-type LSD installed and it is the exact same part used in the more recent 350z and the G37... my guess is that therefore the 370z sport model rear is similar to 350z's, g37's, and of course non-sport 370z's and therefore a sport VLSD could be swapped into a non-sport.... but I have not verified

I have my VLSD up for sale after ~2K miles and a couple track events... again, not sure if it will fit in the pumpkin of a non-sport Z, but if anyone wants to try it drop me a PM

blinkme323 · 12-26-2009, 05:07 AM

Quote:

Originally Posted by needr6parts

i have a base without it and i have never had just one wheel spin even with 2 people in the car .I think all have limited slip the sport package is just a little beefier setup.

Absolutely not. The base is an open diff.

spearfish25 · 12-26-2009, 07:52 AM

I find it rather tough to definitively know that only one wheel is spinning, except for obvious situations like beings stuck in snow. Just taking off from a traffic light, I'd never know if it was one or both tires slipping.

mattjk · 12-26-2009, 02:41 PM

Quote:

Originally Posted by travisjb

The vlsd is no good for the track (track with turns!)... it craps out and becomes effectively an open diff after a few intense laps... IMO you won't need an LSD for 1/4 mile unless you are driving on a crap track with unequal traction for left/right tires

OP, get the sport package if you want the SRM option

This is the reason I opted for base without sport. I saved a few grand on the deal. The only thing I wanted was the sport brakes which I picked up from a vendor here for $1100.

I prefer torsen diffs myself.

kannibul · 12-26-2009, 05:42 PM

Quote:

Originally Posted by spearfish25

I find it rather tough to definitively know that only one wheel is spinning, except for obvious situations like beings stuck in snow. Just taking off from a traffic light, I'd never know if it was one or both tires slipping.

1 wheel burn outs you still go straight and will also follow the direction of your turn, ie, no oversteer until you break loose the other wheel by sling-shotting the rear end out (turning hard enough). You still have 1 wheel holding the road since all the power is going to the freely spinning wheel.

2 wheel burnouts you're generally going to skid sideways a bit, or if the wheel is turned, oversteer/spin out pretty easy. Total or majority loss of traction in the rear, making the rear end very likely to swing out.

travisjb · 12-26-2009, 08:13 PM

Quote:

Originally Posted by mattjk

This is the reason I opted for base without sport. I saved a few grand on the deal. The only thing I wanted was the sport brakes which I picked up from a vendor here for $1100.

I prefer torsen diffs myself.

good for you... you're missing out on the SRM, but if that doesn't matter to you so be it

something for everyone to keep in mind... there are people here upgrading with big brake kits and looking to unload their entire OEM brake setup... should be somewhat less than what matt paid for a slightly used set

12-26-2009, 02:28 AM	#40 (permalink)
travisjb A True Z Fanatic Join Date: Jan 2009 Location: GSO Posts: 2,803 Drives: VIR Rep Power: 188	The vlsd is no good for the track (track with turns!)... it craps out and becomes effectively an open diff after a few intense laps... IMO you won't need an LSD for 1/4 mile unless you are driving on a crap track with unequal traction for left/right tires OP, get the sport package if you want the SRM option I have the Carbonetic clutch-type LSD installed and it is the exact same part used in the more recent 350z and the G37... my guess is that therefore the 370z sport model rear is similar to 350z's, g37's, and of course non-sport 370z's and therefore a sport VLSD could be swapped into a non-sport.... but I have not verified I have my VLSD up for sale after ~2K miles and a couple track events... again, not sure if it will fit in the pumpkin of a non-sport Z, but if anyone wants to try it drop me a PM __________________ 2009 370Z #104 For Sale

12-26-2009, 07:52 AM	#42 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	I find it rather tough to definitively know that only one wheel is spinning, except for obvious situations like beings stuck in snow. Just taking off from a traffic light, I'd never know if it was one or both tires slipping. __________________ 2013 Cadillac V-Wagon, RIP Z

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11-28-2009, 05:23 AM	#35 (permalink)
zellsexy Base Member Join Date: Aug 2009 Location: la Posts: 152 Drives: 370z Rep Power: 16	ok so the sports package is worth it lol, would it be worth changing the flywheel to a lighter one on a automatic? lol