Unstable at high speeds

[Masorcas]

The car has an apr splitter and has the mrr m350 wheels with 285 front and 345 rears on eibach pro kit. It feels really unstable at high speeds . Feel like its floating side to side . Anyone experience this on a performance pack s550?

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[qtrracer]

What does "high speeds" mean?

 

[LG23]

Not at all. What QTR said^

 

[Masorcas]

Over 100mph the car starts swaying around alot

 

[Kinjirra]

Over 100mph the car starts swaying around alot

Took mine up too 120 two days ago just to see... Very stable.

Either you splitter is causing you issues or you alignment is slightly off with those wider tires. I would check the alignment first..the tires could be grabbing at imperfections in the pavement causing the "sway" at those speeds.

Take my suggestion with a grain of salt...no means an expert just what I would do.

EDIT: Could also be the a combo of the tires and springs making the issues with the soft stock suspension bits more pronounced at speed...all those flexy soft rubber bushings in the IRS. Had that issue on a subaru wrx. Inserts really locked it down at speed.

 

[SteedaTech]

The car has an apr splitter and has the mrr m350 wheels with 285 front and 345 rears on eibach pro kit. It feels really unstable at high speeds . Feel like its floating side to side . Anyone experience this on a performance pack s550?

I would first ck the alignment front and rear. Plus, validate that you have at least one inch clearance at curb with the rear bump stops.

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[EricSMG]

Sounds like a combination of tires and alignment. Those are huge back tires. What brand? What is your PSI? What is your rear toe-in?

 

[dentalguy]

I really want to see pics of those rear tires. They sound pretty cool, unless they are causing the floating. Won't side wall bulge cause instability?

 

[WhiteyDog]

Holy sh*t, 345's? That's some wide stuff!!!! And by the way, I had a slight front end "floaty" feeling at lower speed than you described when changing lanes on the open highway. I installed the Steeda G-Trac K-Brace, and it went away. I can definitely say it feels more solid.

 

[ChristianDev]

un related but I hit 160 today:ford:

also, I wish the speedo went to at least 180. why do we have the same speedometer limit as a fusion?

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