Caster/camber plates

[DeltaV]

The Stinger has electric steering so the steering assist is provided by an electric motor rather than by hydraulics.

One thing to try is to ask your Kia dealer to “re-learn” the electric steering.

The lane keep assist is also a good candidate, especially if there are lines painted on the road. My understanding is that on straight roads, LKA (Lane Keep Assist) assist can “hunt” between the lines. I believe LKA (Lane Keep Assist) can be setup to just warn of lane departure without making any steering correction. Maybe try this.

Sorry, I’ve used incorrect terms. Just looked it up:

Lane Keep Assist: Button on dash near near gas cap release. Beeps when you drift near a lane marker.

Lane Follow Assist: Button on steering wheel near cruise controls. Steers the car between lane markers.

Both can be configured in the vehicle setup on the display.

Yes, the LFA motor’s role in power steering had me worried about just unplugging it to ensure it’s off, since Kia has a habit of deciding what’s best for you (see the transmission’s “manual” mode and 4mph).

I have both LFA and LKA set to off.

But this is a prime suspect. I even used LFA to describe the feeling to Kia service, especially because LFA, the one time I tried it, has a habit of gently bouncing between lane markers rather than keeping the car in the center. The “hunting” you mentioned.

I’ll try the power steering re-learning tack next.

THANK YOU!

It’s stuff like this that had me kill the power steering on my RX-7. Parking lots weren’t fun, especially with 265 S-02s, but steering feel was SO much better.

 

[AusStinger]

Here in Korea, there is a vendor who sells non-adjustable camber/caster plates that work with stock dampers. The plates provide -1 camber and could provide up to -2 camber in conjuction with lowering springs. The vendor is also an OEM part supplier to Hyundai/Kia, so the quality should be good. Price is roughly $250 in USD.

And where can one buy a pair of these ?

I'll take any negative camber I can get..

 

[G70LEbyAdoom]

Yes, this is limited to long sweepers. No noise from the tires and no perceptible change to steering feel, which remains light - even in sport mode.

I have a ton of racetrack experience in decently powered rear-wheel drive cars and I’m used to tossing cars into corners and playing with balance. This is not real understeer. The fronts aren’t sliding, nor should they be anywhere near their limit. The “understeer” here feels mechanical…like the ESC is either applying brake force to the outside rear wheel or power to the inside rear. A loosely bolted steering rack would fall into this category and is a good thing to check, though there isn’t the metallic clunk (either audibly or by feel) I’d expect. Still worth checking. And since there must be a motor on the steering shaft to enable lane keep assist, I’d also suspect that something is detecting oversteer (that isn’t there) and opening up the steering slightly for a count, then undoing that steering, then again, like a pendulum. Definitely feels like an electronic system trying to correct a situation that doesn’t exist.

Thanks for the input!

Im no expert and I could be late to the party here, but it sounds like something could be wrong with whatever module controls the torque vectoring of your car.

 

[DeltaV]

@Adoom, thanks. Yes, that’s what I’m chasing. I’ve requested expertise in another thread.

Any thoughts?

 

[G70LEbyAdoom]

@Adoom, thanks. Yes, that’s what I’m chasing. I’ve requested expertise in another thread.

Any thoughts?

Take out the AWD fuse from the box under the cars hood while the cars off, then try your damnedest to get it to repeat what it was doing before and see if it still does it. you wont receive any error lights on the dash for disabling the AWD and it does not damage the car at all.
The AWD fuse is the Middle Yellow 20amp fuse in a row of three near the middle bottom of the fuse box. if that description is not enough for you, just google it and a diagram will show you.

if you have done this already, disregard it.

 

[DeltaV]

Good idea. Already done it. No change in behavior.

But thanks! Keep the ideas coming!

 

[G70LEbyAdoom]

Good idea. Already done it. No change in behavior.

But thanks! Keep the ideas coming!

Lemon Law and have Kia replace the entire car? maybe have them give you a scorpion edition for comp?
That's about where my advice can end, as I can diagnose issues on a 40 year old 454/427 pretty easy, but I don't really want to touch the electronic stuff in modern cars, which is very ironic for me considering I work in IT for a living.

 

[DeltaV]

Service manager has been trying to locate a car for me to drive for comparison, but the pickings are slim. I wouldn’t want to borrow a new car since I wouldn’t have wanted my car to have gone through such testing before I got it.

 

[G70LEbyAdoom]

Service manager has been trying to locate a car for me to drive for comparison, but the pickings are slim. I wouldn’t want to borrow a new car since I wouldn’t have wanted my car to have gone through such testing before I got it.

Where are you at in the USA? maybe one of the members here would be willing to help you out if they are nearby.

 

[GT Elite]

So the electric steering re-learn didn’t work….crap. I totally agree this is an electronic/systems problem.

I don’t know all that much about all the modules/computers in a Stinger, as I’ve only had my 2022 GT Elite (GT2) since June and it sits in the garage all the time. My experience has been mostly with Corvettes (C4, C6 & C7). My one thought is to have the module/computer where the stability program resides re-flashed. In a Corvette, this would most likely be in the BCM.

The saga continues!!

PS: I also would like to get my hands on a set of caster/camber plates, or camber adjusters at a minimum!

 

[DeltaV]

So, since my last post, just about everybody in the dealership’s service department has left. So I’m starting over.

As an aside, has anyone swapped the MacPherson strut top mounts, left for right, and seen an increase in camber? I’ve heard other cars (BMW) have had good results.

 

[MerlintheMad]

So, since my last post, just about everybody in the dealership’s service department has left. So I’m starting over.

As an aside, has anyone swapped the MacPherson strut top mounts, left for right, and seen an increase in camber? I’ve heard other cars (BMW) have had good results.

Since reading through this last time, I've had coilovers recommended to me: was told that if I noticed a difference in stability and handling with sway bars, the difference with coilovers is like night and day. And although I don't know anything about the physical mechanics of any of this, I've read that camber can be adjusted with coilovers (my original interest in any of this is to reduce outside tire wear especially in front).

I have no idea if coilovers would have the least effect on your "oscillating" steering phenomenon?

 

[DeltaV]

Since reading through this last time, I've had coilovers recommended to me: was told that if I noticed a difference in stability and handling with sway bars, the difference with coilovers is like night and day. And although I don't know anything about the physical mechanics of any of this, I've read that camber can be adjusted with coilovers (my original interest in any of this is to reduce outside tire wear especially in front).

I have no idea if coilovers would have the least effect on your "oscillating" steering phenomenon?

@MerlintheMad, thanks for the note.

Yes, a custom/tuned damper/spring replacement can have a tremendous impact on how a car handles. I’ve configured almost a dozen setups and performed installations for myself and friends over the decades. These do normally come with additional camber adjustability.

With a GT2, though, I would hate to lose the electronically adjustable (and constant response) suspension (plus Mando).

With our suspension designed by the BMW suspension designer, I was hoping that the industry that arose to fix the inherent issues with those cars would be leveragable by us, camber-plate-wise.

With no camber plates available for our stock components, I was hoping that flipping the upper mounts was a BMW trick that would transfer.

Still looking…

 

[Rodtheviking]

What about the LSD? It feels to me that the diff is a little aggressive, like it's pushing the front out in the tight corners. I have some Royal Purple to install and try out.

 

[DeltaV]

That’s been on my list for other reasons, but you raise a good point.

I’m used to a Gleason-Torsen LSD w/straight weight 90 Royal Purple in both LSD and box.

 

[maxthestinger]

Has anyone been able to find a caster plate for the front to fit the stock dampers?

 

[MerlintheMad]

Nope. Not reported here, anyway. Welcome.

Has anyone been able to find a caster plate for the front to fit the stock dampers?

 

[AusStinger]

Has anyone been able to find a caster plate for the front to fit the stock dampers?

I was in communication about a year ago with a guy here in Australia who was prepared to engineer a set up and asked around if anyone could loan him a strut / pair of struts to use as test beds and........that's where it died.

Real shame since a well made set of camber adjustable strut tops would be a popular selling item IMO.

 

[BelairBruce]

Have you looked at these? Front Strut Bar To Chassis Mount Bush Kit - Caster Adjustable I have no experience of them personally but I know others have them.

 

[AusStinger]

Have you looked at these? Front Strut Bar To Chassis Mount Bush Kit - Caster Adjustable I have no experience of them personally but I know others have them.

Those are for caster but were talking camber.

I want 1 to 1.5 neg of camber so bad...