[SuckaGDog]

Originally Posted by BM dnobagaV

Rather simple. Give the type of wheels/tires you got on & the tire pressure you run at.

I'm asking because my AMG finally arrived from the shop. Driving the last few days, I could literally feel every bump even in comfort mode. Stock PSI suggested is 51. Seriously, 51.

That's fully loaded, up to 186mph, with 4 passengers. Why would I ever be in that scenario? I assume it would be better for daily driving in CA(land of bad roads) if I let them to ~40psi?

Stock at 33 in my 528i and the car is an absolute dream. Like on a cloud.

Are you looking at the door pressures from the door jam? If so, those are incorrect as they’re for full capacity. You need to reference to the tire pressure sticker inside the fuel filler cap. I was confused when my Black Series was delivered.

[BM dnobagaV]

Originally Posted by SuckaGDog

Are you looking at the door pressures from the door jam? If so, those are incorrect as they’re for full capacity. You need to reference to the tire pressure sticker inside the fuel filler cap. I was confused when my Black Series was delivered.

What do you run on your C63?

[SuckaGDog]

Originally Posted by BM dnobagaV

What do you run on your C63?

33psi all around (cold tires). I measure them in the morning in the garage after the car has been sitting overnight.

[hellokitty]

32 psi on stock 666m wheels and PSS tires.

also use a QUALITY air pressure gauge to get it down to the exact psi on all 4 corners. my acceleration in a straight line improved tremendously after i purchased a solid analog gauge over my digital one. even the slightest differential in PSI can make the car feel sketchy on WOT.

[lemetier]

Originally Posted by BM dnobagaV

Rather simple. Give the type of wheels/tires you got on & the tire pressure you run at.

I'm asking because my AMG finally arrived from the shop. Driving the last few days, I could literally feel every bump even in comfort mode. Stock PSI suggested is 51. Seriously, 51.

That's fully loaded, up to 186mph, with 4 passengers. Why would I ever be in that scenario? I assume it would be better for daily driving in CA(land of bad roads) if I let them to ~40psi?

Stock at 33 in my 528i and the car is an absolute dream. Like on a cloud.

NHTSA has required a specific door jamb label that can only display the minimum cold pressure under maximum certified operating load as originally installed by the manufacturer for several years now. Specific to your CLS63, that's 51psi all around due to the Performance Pack speed limiter increase (high speed aerodynamic load tire sidewall compression compensation).

For the original OE tires (temperature, size, load index, and speed rating), the recommended pressures are:

- Operation up to 155mph
Light Load: 38f/35r
Normal Load: 39f/39r

- Operation between 156mph - 186mph
Light Load: 48f/44r
Normal Load: 51f/51r

Recommended pressures are specific to the application and tire design specifications. For example, I have two vehicles that are the same make/model, fitted with identical tires, but they have different equipment. At normal loads, the lighter one is recommended 43f/51r, while the heavier one is 48f/61r regardless of load.

Originally Posted by cxp213

When people refer to "cold" tire pressures, they're not talking about a specific temperature threshold

Actually there is a specific cold temperature (20°C/68°f). The ambient acclimation correction factor is 1.45psi/0.1bar per 10°C/18°F

[Mbbrewer]

Originally Posted by hellokitty

32 psi on stock 666m wheels and PSS tires.

also use a QUALITY air pressure gauge to get it down to the exact psi on all 4 corners. my acceleration in a straight line improved tremendously after i purchased a solid analog gauge over my digital one. even the slightest differential in PSI can make the car feel sketchy on WOT.

Total placebo

[xQx]

Originally Posted by lemetier

while the heavier one is 48f/61r regardless of load.

SIXTY ONE PSI??!!!

Damn, I'd be afraid to fill that thing up. I hope it's well mounted on its rim.

[cxp213]

Originally Posted by lemetier

Actually there is a specific cold temperature (20°C/68°f). The ambient acclimation correction factor is 1.45psi/0.1bar per 10°C/18°F

That's great but look at the type of questions and responses here. Do you really think getting more technical is beneficial to them? Lol, when was the last time you spoke to anybody about cold tire pressures, measured ambient then adjusted your tires based on that?