Does anyone know if either the stock sport Vlsd or a quiffe diff would work on an X sedan? I understand 4.08's wouldn't work, but why not a Semi-locking diff?

 

I'm no mechanic, but this still gave me a WTF reaction. Why in the world would you want to impose a mechanical 2WD limited slip mechanism on a car that essentially has computer controlled limited slip to all four corners? I don't get it.

Does the AWD G become RWD-only if you turn off TC? That seems implausible, but you know your AWD car better than I do. Maybe I'm out of my element responding here. That question confused me.

 

gtr's have a rear locking differential with it system. What the awd G has is open rear and front. It would only add to the handling characteristics of the car if it is feasible. Look at the wrx vs. STI both awd, yet the STI has lsd in the rear which greatly increases the feel and handling characteristics. Same with the AUDI S models vs. The Quattro A models which do not.

 

I think the x just has a limited slip center diff that routes power to open front/rear differentials.

At least that's how it was in the Subaru world, except for the STi which had limited slip front, center and rear diffs.

Still, I dunno what it would accomplish.

 

Maybe I'm over thinking it, but having a peg leg rear end is not fun even when the front engages. See below in regards to the GTR's sophisticated set up.


Nissan Skyline GT-R's ATTESA E-TS PRO
Since R33, Skyline GT-R also uses multi-plate clutch instead of conventional center differential, in addition, as rear differential lock too. Normally it is rear-wheel drive, the front wheels only intervene whenever necessary.

What makes the Skyline system catches my heart is its real world behaviour. Without driving it or reading road test reports, you might not discover its maturity.

As I have mentioned earlier, throttle-controllable oversteering is usually more desirable to real drivers than pure neutral steering. However, what a pity most permanent four-wheel drive cars are inherently unable to deliver power oversteering. Porsche 959 was one of the exception because it had 60% weight bias towards the rear, but for a front-engined car like the Skyline GT-R, the best solution is to leave it as rear-wheel drive in normal conditions.

The clever electronic control system is fed by all the information that Porsche 959 had, such as G-force, boost pressure, throttle position etc, in addition, the speed of individual wheels measured by ABS wheel speed sensors. By these information, the computer knows whether the car is running out of cornering limit or not. If not yet, the multi-plate clutches won't intervene, thus the car can power slide through the corner smoothly. In case out of limit, the multi-plate clutch will engage and send torque to front wheels, increasing traction.

This makes Skyline a rare example of 4WD having oversteering ability.

 

What do you think a LSD rear is going to do for your awd G?

 

Have you driven one out of a turn on moderate throttle? One rear wheel spinning is not desirable even though I am awd the rear end is a bit squirly even unexpectedly by the time the front engages.

It would be a mod like any other. I likely will be doing sways and other suspension mods which only add to the effect of the rear breaking loose.

Perhaps I'll add some stickers to my car instead..

 

Are you getting rear wheel slip in the dry?

Dedicated summer tires would probably help more than a LSD if that's the case.

I came to the G from a turbo subaru, so I understand your thought process, but my experience was different. Maybe the infiniti awd system just sucks.

 

I like the awd system, just the rear peg leg does annoy me. The tail does whip out, but not in the same way a rwd car does with a lsd. It is not controlled and unpredictable. It is one wheel spinning probably the outside wheel with the least weight out of the turn.

Once I do the suspension mods I will be a bit weary of the rear end on cornering and turns which will make it more prone. Tires will only help so much in that case.

I will just have to live with it, as there doesn't seem to be a feasible option. Interesting though that the 335xi's do have aftermarket support to upgrade both front and rear diffs from open to lsd.