Floating feeling at higher speeds on new rear tires... - Page 2

Aug 23, 2011 | 04:57 PM

#26

VividRacing

Former Vendor of MBWorld

Joined: Mar 2006

Posts: 6,069

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From: Gilbert, AZ

G63, C190 AMG GTC, W209 CLK63 BS, W208 CLK430

Quote:

Originally Posted by MB_Forever

I'm not sure if this applies to your setup or not but sometimes when you use a tire that is meant for a wider rim than the one you are using, the sidewall becomes more soft and "mushy" which creates the floating condition you described above

What size rims/tires are you using?

That's called "stretching" the tire, btw.

Quote:

Originally Posted by citylightva

My car also feels very floaty after excessive drinking

Kidding of course...

My cars always feel really slow after excessive drinking... Probably because I refuse to put my keys in the ignition?

Quote:

Originally Posted by SMP

Vic, since you only changed the rear tires, I'd start by checking the tire pressure first. It could be the alignment ....... but wasn't the car aligned after you lowered it with the new tires (first set) and wheels? Unless you hit something or the tire shop screwed something up, the alignment doesn't change by itself.

One more thing: Are these tires directional? Sorry, I'm not familiar with Nitto Invo's. If they flipped them at installation, it will feel like the way you described it.

Of course the alignment can change on its own... If the alignment could never change, then why would anyone get an alignment?

Aug 23, 2011 | 11:44 PM

#27

MBH motorsports

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Joined: May 2009

Posts: 2,305

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From: Valley of the Sun, Arizona

C63, SL55, E55, CLS55, ML63, C55

Quote:

Originally Posted by citylightva

Could be because your old tires were actually worn in to the bad alignment leaving a larger unaligned contact patch, and now the new ones have a smaller contact patch from misalignment..? That sounds plausible doesn't it

I've had this with incorrect camber before going from a used set to a new set for obvious reasons...I still love your freaking car.!!

And also what Justin just wrote...My Hankooks feel quite a bit less floaty with 1K miles on them now...

+1 This is pretty much whats going on.

@vic. If you are lowered (and you are, I am too) Whats happening is your rear tires have worn to the camber angle. In turn allowing more of the tire to come in contact with the road. So my guess is... the inside of your tires were smoked, yet the rest of the tire looked Ok or Ok-ish.

Now that you have new rear rubber. There is only so much of the rear tires contacting the ground because the tires uneven to the ground in relation to your camber. Essentially making the amount of new tire touching the road about the size of a basically tire, give or take.

Over time this feeling should stop. What that means though, is your insides of your tire are wearing out. Allowing more tire to contact the road.

I had the same issue on my SL55 after I swapped to new tires. In fact I still kind of have it.
A few solutions to this are:

Adjust ride hight to stock. See if it goes away
Look into a camber/toe kit.
raise the car up when driving

Just some suggestions that could help or solve the problem. As I sure you know. When your car is lowered its going to burn up the inside of the tire faster. Something to pay attention to.

Best Regards
-mike

Aug 24, 2011 | 12:22 PM

#28

Vic55

Thread Starter

Administrator

Joined: Nov 2001

Posts: 12,263

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From: THE Orange County, California

2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS

Mike, great feedback- I dont want to raise the car and you are absolutely right- I smoked the inners due to the lowering. Since its a W212 (springs up front) I dont have the raise up option. Ill see tomorrow how it feels after the alignment.

Thanks again.

Aug 24, 2011 | 02:51 PM

#29

Jakpro1

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Joined: Jan 2004

Posts: 7,092

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From: Salt Lake City (but not Morm)

2003 E55 & 2014 GL550

Does the newer 63 "squat" like our older airmatics at higher speeds? Bet not but just was an idea. If she is squatiing down at higher speeds, might be in contact slightly with tire.

I defer to Mike above. Clueless on this kinda stuff.

**edit, just read your reply Vic. Nevermind.

Sep 7, 2011 | 03:38 AM

#30

BO Knows

Senior Member

Joined: Jul 2002

Posts: 375

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From: Bay Area, CA

2010 C63, 2007 X5

Thanks to this thread, it may not be my tires... I just got some new rear Hankook V12 for my C63 and having the same exact problem. Going at high speeds or hanging turns my car feels unstable/floating. I thought the Hankook were crap tires, now I need to look into alignment, KW v3 adjustments, etc...

I only have 300 miles on the new tires, maybe it need some time to break in. I found this thread too https://mbworld.org/forums/c63-amg-w...ng-issues.html

Last edited by BO Knows; Sep 7, 2011 at 04:10 AM.

Sep 7, 2011 | 11:58 AM

#31

TTMotorsports

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Joined: Oct 2008

Posts: 1,181

Likes: 4

From: Long Island, NY

Whatever we're tuning!

Vic-

It is a combination of your new tires lack of contact point with being lowered(I am sure you are slammed

) and your toe is out of spec which is most likely the primary culprit.

I am sure you will get it figured out.

Sep 7, 2011 | 02:37 PM

#32

chiromikey

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Joined: Jun 2006

Posts: 6,649

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'03 E55, Range Rover Sport Supercharged, Ducati 748R

anyone want to offer some optimum alignment specs (front & rear) to ask for? those of us with adjustable camber and toe might need to request specific settings...

Sep 7, 2011 | 03:07 PM

#33

Yuille36

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Joined: Apr 2009

Posts: 6,020

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From: Alexandria, VA

07 E63 AMG, 10 C63 AMG, 07 E63 Designo, 07 E350, 09 C300, 07 C230

The floating feeling that your getting might not be an issue with tires. It possibly could be from bad or worn out rear subframe bushing. Mine are being replaced as we speak, I should ge tthe car back this evening.