C63 AMG (W204) 2008 - 2015
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new owner- 2012 feels unstable on the highway

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Old Sep 11, 2015 | 06:15 PM
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2000 Acura NSX, 2012 C63 P31 (gone and not forgotten), 2015 C63 507
new owner- 2012 feels unstable on the highway

UPDATE PAGE 4

I just took possession of my P31 C63
Everything on the car is stock

18" wheels front and rear with the split 5 spoke
Continental Sport contact at the front: 235/40/18
Continental Extreme contact rear : 255/35/18
pressure is 39-40 front and 45 rear

tires have GREAT tread 7/32

at take off and under 55mph - car feels fine
over 65-70 on the highway cruising im floating around the lane

is this because i dont have a limited slip and the car is pushing in one direction?
is it that I dont understand F/R with 445 ft/lbs tq?

any help is appreciated before i hit my first track event.

again stock suspension and wheels.... makes no sense to me

Last edited by 95gsrturbo; Sep 17, 2015 at 06:28 PM.
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Old Sep 11, 2015 | 06:25 PM
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Congrats on the new purchase.

By floating around, do you mean pulling left and right at random times?
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Old Sep 11, 2015 | 06:37 PM
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Old Sep 11, 2015 | 06:51 PM
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More like contanstly if I'm on throttle. Not like pulling as if there was an issue with an alignment. It's different hard to explain except for "floating" it's the only word I can think of.
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Old Sep 11, 2015 | 06:52 PM
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Originally Posted by dbldpr
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Old Sep 11, 2015 | 07:00 PM
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It is definitely not normal to feel like the car is floating.

The lack of an LSD will not be the cause of that feeling.

Get an alignment. Was the car ever in an accident? Aside for the tread depth being even, how does the wear on the tires look? is it even across the tire?
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Old Sep 11, 2015 | 07:03 PM
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Originally Posted by 95gsrturbo
More like contanstly if I'm on throttle. Not like pulling as if there was an issue with an alignment. It's different hard to explain except for "floating" it's the only word I can think of.
It could be your tires mismatched. Check the suspension too.
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Old Sep 11, 2015 | 07:22 PM
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Get an alignment. Or at least (if not getting an alignment) get it on a hoist of a suspension place, and get them to check everything is tight, and nothing is prematurely worn out.
Even on newer cars, some parts can be defective.

As previously mention, lack of LSD wont cause this
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Old Sep 11, 2015 | 07:34 PM
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Is the freeway surface grooved? In my experience, some tires tramline so badly on grooved pavement that I've stopped on the highway because I thought I had a flat tire.
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Old Sep 11, 2015 | 07:59 PM
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Thank you everyone for your replies.
Tire tread is perfectly even across all 4 and as I mentioned it's different than an alignment pull but I'll do that asap to check

Does anyone know if alignment is covered by the factory warranty?
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Old Sep 11, 2015 | 08:02 PM
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Your tires are over inflated. Happened to me before. Reduce the PSI to spec and you should be gtg.
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Old Sep 11, 2015 | 08:02 PM
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Originally Posted by 95gsrturbo
Thank you everyone for your replies.
Tire tread is perfectly even across all 4 and as I mentioned it's different than an alignment pull but I'll do that asap to check

Does anyone know if alignment is covered by the factory warranty?
No it is not, unfortunately.
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Old Sep 11, 2015 | 08:06 PM
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Thank you everyone for your replies.
Tire tread is perfectly even across all 4 and as I mentioned it's different than an alignment pull but I'll do that asap to check

Does anyone know if alignment is covered by the factory warranty?
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Old Sep 11, 2015 | 08:13 PM
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new owner- 2012 feels unstable on the highway

Originally Posted by - Guilty -
Your tires are over inflated. Happened to me before. Reduce the PSI to spec and you should be gtg.
+1
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Old Sep 11, 2015 | 08:16 PM
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new owner- 2012 feels unstable on the highway

.
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Old Sep 11, 2015 | 08:21 PM
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Originally Posted by - Guilty -
Your tires are over inflated. Happened to me before. Reduce the PSI to spec and you should be gtg.
I'm actually under spec right now.
Inside the door shows 42 front 46 rear.

I'm at 39/45
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Old Sep 11, 2015 | 08:23 PM
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Originally Posted by chrisridebike8
Is the freeway surface grooved? In my experience, some tires tramline so badly on grooved pavement that I've stopped on the highway because I thought I had a flat tire.
^+1. Sounds like tramlining to me. If the car is darting right and left over the drainage grooves with no other rhyme or reason, that'd be my bet.
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Old Sep 11, 2015 | 08:27 PM
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Originally Posted by 95gsrturbo
I'm actually under spec right now.
Inside the door shows 42 front 46 rear.

I'm at 39/45
Nvm then Idk lol
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Old Sep 11, 2015 | 08:35 PM
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Mismatched tires will do that.

That 39/45 spec which is front which rear?
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Old Sep 11, 2015 | 08:40 PM
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Originally Posted by chrisridebike8
Is the freeway surface grooved? In my experience, some tires tramline so badly on grooved pavement that I've stopped on the highway because I thought I had a flat tire.

Unfortunately no - no grooves on the road... I assume you mean like construction.

Example: today I was cruising in 6th gear (S+ mode if that helps) and wanted to pass an 18 wheeler. Blinker on and I begin to change lanes - car downshifts and I begin to change ... car carries me across 2 lanes to the left. I changed one lane... car "floated" on air the other lane

But it happens within the same lane while cruising too. Just sliding left and right.

Gonna take take a ride with a buddy now and see if he can explain it any better.
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Old Sep 11, 2015 | 08:55 PM
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2000 Acura NSX, 2012 C63 P31 (gone and not forgotten), 2015 C63 507
new owner- 2012 feels unstable on the highway

He says car feels "loose"

As if something suspension was disconnected

These cars don't have an active suspension do they?

Last edited by 95gsrturbo; Sep 11, 2015 at 08:58 PM.
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Old Sep 11, 2015 | 08:55 PM
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what type of tires are they? correct load/speed rating?
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Old Sep 11, 2015 | 09:00 PM
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Originally Posted by rickclass
what type of tires are they? correct load/speed rating?
Yes
Continental sport contact Y rated up front
Continental sport contact extreme Z rated rear
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Old Sep 11, 2015 | 09:06 PM
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So it's dark but crawled under the car and looked and there does seem to be an electronic dampener of sorts on the front which could be a problem but I would assume if it was I would get a code
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Old Sep 11, 2015 | 09:19 PM
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Ummm I dont think these cars have any adaptive suspension
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