AWD display?

[Mkbruin]

2018 Stinger AWD.

All other AWD vehicles I’ve owned have a display on certain screens that show the real-time torque vectoring of the AWD system.

Does the Stinger have this? I played around a bit and couldn’t locate it.

(Hyundai Kona display for reference)

 

[Snicklefritz]

Nope. Nothing like that on any Stinger. We are told that the power split is 40-60 on all drive modes but Sport, which is 20-80.

 

[Mkbruin]

F/R split is good to know, I was hoping to also see left/right vectoring in real time.

Shame we don’t have that, but I appreciate the response!

 

[Thomby]

I was hoping to also see left/right vectoring in real time.

Very few cars would have the ability to direct power left to right, and I definitely wouldn't expect it from a FWD-based system like the Kona. All that display is telling you is the degree to which the clutch pack that sends power to the rear is locking up (with actual applied torque being determined by grip).

@D.J. has posted some videos that overlay the pressure in our transfer case clutch packs (which control how locked up the front driveshaft is), but again that isn't enough to give you an actual torque split, and from what I remember the pressure was bouncing all over the place meaning it isn't a fixed split.

 

[D.J.]

I was hoping to also see left/right vectoring in real time.

Our cars do not possess any left/right power vectoring.

Instead, we get the opposite, left/right brake application.

 

[Mkbruin]

The Kona picture was merely an example. My old MDX reflected an active vectoring… it was fantastic to watch in snow/ice, or when hustling through roundabouts.

 

[Mkbruin]

Our cars do not possess any left/right power vectoring.

Instead, we get the opposite, left/right brake application.

Good to know. I’ll need to read up on this system a little more.

 

[D.J.]

@D.J. has posted some videos that overlay the pressure in our transfer case clutch packs (which control how locked up the front driveshaft is), but again that isn't enough to give you an actual torque split, and from what I remember the pressure was bouncing all over the place meaning it isn't a fixed split.

Yup.

In any drive mode, the transfer case provides "UP TO" X percentage of power to the front.

Primary drive is always to the rear, and depending on drive mode, and drive conditions (steering angle , yaw, etc), some percentage of that power is clutched to the front ...

Not a particularly entertaining video, but here it is.
Enjoy.

 

[D.J.]

Also this thread - which has a longer video that I intended to edit down to something more manageable, but I never got around to it.

 

[D.J.]

Good to know. I’ll need to read up on this system a little more.

Can start here...

Kia Stinger: Brake System / ESP(Electronic Stability Program) System

 

[Thomby]

My old MDX reflected an active vectoring… it was fantastic to watch in snow/ice, or when hustling through roundabouts.

SH-AWD is a FWD-based system, meaning you have a transaxle permanently driving the front wheels, and a clutch that can send power to the rear.

So with clutches open, it's 100% FWD (maybe 90% because there's always some fluid drag), and with clutches locked they probably quote a 50:50 split, which just means the front & rear axle speeds match (but slip/grip determine actual split).

I believe later SH-AWD systems added a rear LSD or e-Diff, which limits slippage across the axle but can't dictate a specific split. So a display showing corner torque breakdowns is likely just applying a F:R multiplier based on clutch lockup, and maybe a L:R one based on wheel speed differences.

Sorry if that's a downer but I'd imagine 95% of such displays are just synthetic numbers. You could take @D.J.'s clutch duty cycle numbers and display that as front torque percentage (or divide it by 2 so full lockup is "50:50"), but that's still fake (consider a fully locked clutch pack with fronts on ice, or rears on ice).

 

[Mkbruin]

SH-AWD is a FWD-based system, meaning you have a transaxle permanently driving the front wheels, and a clutch that can send power to the rear.

So with clutches open, it's 100% FWD (maybe 90% because there's always some fluid drag), and with clutches locked they probably quote a 50:50 split, which just means the front & rear axle speeds match (but slip/grip determine actual split).

I believe later SH-AWD systems added a rear LSD or e-Diff, which limits slippage across the axle but can't dictate a specific split. So a display showing corner torque breakdowns is likely just applying a F:R multiplier based on clutch lockup, and maybe a L:R one based on wheel speed differences.

Sorry if that's a downer but I'd imagine 95% of such displays are just synthetic numbers. You could take @D.J.'s clutch duty cycle numbers and display that as front torque percentage (or divide it by 2 so full lockup is "50:50"), but that's still fake (consider a fully locked clutch pack with fronts on ice, or rears on ice).

The Acura system was a little more advanced than that.

 

[D.J.]

The Acura system was a little more advanced than that.

It's true, the Type SH is more advanced.

But I much prefer driving my AWD Stinger everyday.

Just personal preference I guess.

 

[Mkbruin]

It's true, the Type SH is more advanced.

But I much prefer driving my AWD Stinger everyday.

Just personal preference I guess.

Agreed.

 

[Thomby]

The Acura system was a little more advanced than that

That is interesting, I'm assuming they just continued to add features to subsequent generations. I guess you could claim "100% of axle torque to one wheel" by adding a lockup diff (with an asterisk that you only get 100% torque to one wheel if the other has zero grip), but putting that behind a FWD-based system trying to siphon power to the rear axle via clutch packs just seems wrong.

And torque vectoring to induce a yaw implies it goes a step further...you'd need the ability to overdrive the outer wheel when the inside wheel isn't necessarily slipping, which is a bit more complicated mechanically. At that point why not face the engine & transmission the right way and give it a proper drivetrain layout to work from?