Make Mustang More Stable.

[Pauliejr]

Plain and simple....maybe.

My daily driver is a 2013 c350.

While the Mustang Takes corners better and “handles” better in spirited/track driving. I can help but feel way more comfortable and stable at speed in the c350. Yes this is partially because it’s stock and also because it’s German.

I have a 2016 GT PP
Koni yellows all around
Eibach springs
Cradle alignment kit
Steeda rear shock mounts
Bmr lockouts.

I was on an open stretch earlier today and got up to 100mph and can’t help but notice how “sketchy” the car feels.

YES I do need a new alignment I should think this might be a cause, however I still feel like the car does not feel like it’s riding on rails at higher speeds in a straight line.

What are my steps to correct this. Ultimate goal is for the car to feel very solid/ safe/and confident at speeds without sacrificing actual handling.

Not looking for drag setup. Track/street.

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[1 old racer]

if you want a smoother ride maybe trade someone your Eibach springs and Koni shocks for a stock convertible spring and shock set up.

 

[Pauliejr]

if you want a smoother ride maybe trade someone your Eibach springs and Koni shocks for a stock convertible spring and shock set up.

Not looking for a “smoother” ride. I actually have the Konis setup pretty stiff. I am no stranger to, nor do I mind a rough, stiff ride.

My post was in reference to stability

 

[thelostotter]

It's probably the alignment, especially if you already know it needs one. It can make a big difference.

 

[1 old racer]

Sorry I miss understood. Then a good alignment will be the best 1st move.

 

[Roadway 5.0]

Here’s the magic potion:

1) Install Steeda bump steer and roll center correction kit

2) Get an alignment

3) Buy lower profile Michelin PS4S tires and mount them up

I guarantee you this will give you the confidence at speed that you’re seeking. It will also give you precise and instantaneous handling.

 

[Norm Peterson]

Which Eibachs/how much lowering?

What's the alignment at now?

Have you tried dialing the shock/strut settings back a bit? Tried staggering the settings, rear relative to front?


Norm

 

[Pauliejr]

Which Eibachs/how much lowering?

What's the alignment at now?

Have you tried dialing the shock/strut settings back a bit? Tried staggering the settings, rear relative to front?


Norm

Car needs to be aligned since some changes have been done, I’m running about 3/4 stiff front and back. My alignment is def of up front as the wheel is slightly off.

The car just seems unstable pulling at a high speed up front.

 

[Slow6]

OP, did you reclock your bushings after lowering your car? If not, do that before your next alignment. I experienced the same issues until I stumbled upon that thread and clocked my own bushings.
Recently went 1XX mph somewhere in not California, and on an uneven road. I've never felt more stable in my life.

Link to thread re: clocking your bushings


EDIT: also, get an alignment and then re evaluate your opinion. Having alignment off, on even the most "balanced and stable" exotic will still make it feel like a clunky, unstable piece of metal.

 

[cyclonetron]

Car needs to be aligned since some changes have been done, I’m running about 3/4 stiff front and back. My alignment is def of up front as the wheel is slightly off.

The car just seems unstable pulling at a high speed up front.

What Eibachs are you on?

 

[valentinoamoro]

Here’s the magic potion:

1) Install Steeda bump steer and roll center correction kit

2) Get an alignment

3) Buy lower profile Michelin PS4S tires and mount them up

I guarantee you this will give you the confidence at speed that you’re seeking. It will also give you precise and instantaneous handling.

This this and so much this. I come from German autos as well and noticed, while my S550 is waaay more fun and easy to control with the throttle (and more work!), it wasnt anything close to as stable >100mph.

>I have not done the bumpsteer and roll center kit (on my list, I am lowered much less with GT350R springs), but def recommend alignment (I believe toe-in is important in the front for stability, Audis do this but I defer to others who know better).
>Tires are a big deal. The factory tries were no where near as good as the PSS on my German cars. The Indy 500s I have now are much better (and a solid tire), but not as stable at speed as PSS.
> My GT350R springs and steeda adjustable shocks with mounts (and FRPP bumpstops) made a massive difference to high speed stability.

I will also say you should consider a front splitter. One issue with 15-17 Stangs is the front aero is not quite there. They specifically addressed this in the mid year refresh. For example, they cleaned the aero underneath, made changes to the grill and bumper, hood etc.. Our pre refresh 550s have terrible hood turbulence. This mod made a huge difference (while adding 10 pounds on the lower nose unfortunately!).

https://zl1addons.com/products/mustang-splitter-ext

 

[Roadway 5.0]

This this and so much this. I come from German autos as well and noticed, while my S550 is waaay more fun and easy to control with the throttle (and more work!), it wasnt anything close to as stable >100mph.

>I have not done the bumpsteer and roll center kit (on my list, I am lowered much less with GT350R springs), but def recommend alignment (I believe toe-in is important in the front for stability, Audis do this but I defer to others who know better).
>Tires are a big deal. The factory tries were no where near as good as the PSS on my German cars. The Indy 500s I have now are much better (and a solid tire), but not as stable at speed as PSS.
> My GT350R springs and steeda adjustable shocks with mounts (and FRPP bumpstops) made a massive difference to high speed stability.

I will also say you should consider a front splitter. One issue with 15-17 Stangs is the from aero is not quite there. They specifically addressed this in the mid year refresh. For example, they cleaned the aero underneath, made changes to the grill and bumper, hood etc. This mod made a huge difference (while adding 10 pounds on the lower nose unfortunately!).

https://zl1addons.com/products/mustang-splitter-ext

You’re right on about toe-in. I actually ran about .10 on the fronts while here in Germany (will go to 0.06 when I return to the US). Toe-out in any capacity will make high speeds a scarey place to be (hope they have quick hands)!

I forgot about the splitter, good call. I have one as well for the same reasons you stated

 

[valentinoamoro]

You’re right on about toe-in. I actually ran about .10 on the fronts while here in Germany (will go to 0.06 when I return to the US). Toe-out in any capacity will make high speeds a scarey place to be (hope they have quick hands)!

I forgot about the splitter, good call. I have one as well for the same reasons you stated

I'm running .05 toe out in front. I did that to increase steering responsiveness. Even with that high speeds are much better because of the cumulative effect of the other mods.

If I do the bumpsteer and lateral links I may revisit the toe out. Lol

 

[Bluemustang]

I'm running .05 toe out in front. I did that to increase steering responsiveness. Even with that high speeds are much better because of the cumulative effect of the other mods.

If I do the bumpsteer and lateral links I may revisit the toe out. Lol

Personally I like the zero toe up front over the toe-in. The toe in makes a little more easy driving especially at higher speeds, but it sacrifices some responsiveness on the street around town which I notice.

In addition, the lateral links will improve your turn in response noticeably. It doesn't lean in slow turns like it would have before. You don't really notice the difference until it goes away.

 

[valentinoamoro]

Personally I like the zero toe up front over the toe-in. The toe in makes a little more easy driving especially at higher speeds, but it sacrifices some responsiveness on the street around town which I notice.

In addition, the lateral links will improve your turn in response noticeably. It doesn't lean in slow turns like it would have before. You don't really notice the difference until it goes away.

Do you know if the GT350R has a different alignment setting from the factory? I wonder what those numbers are.
OK, so zero toe up is something I will look at. I def notice the steering in the highway is more darty that I would like (since I made the toe out change), at the same time, I'd hate to kill the turn in.

Yeah, the extended ball joints and bumpsteer kit in my next (and hopefully last) mod. That with the alignment.

I've been sorely tempted by Giro disc lightweight rotors (its a mod that sheds 20 pounds of unsprung rotational weight in the front) but the price just makes me stay away (~1000).

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