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I’ve been encountering that awfully dreaded tire skip on the Continental run flats and just had a few questions I was hoping to clear up. I have not made any adjustments to the vehicle myself so all changes are from the dealership.
The dealership has set the tire pressure at 300kpa (44 psi) on all four corners when cold. This reaches over 320 (46) when at temperature. I noticed this was higher than the fuel door sticker?
The camber/toe in etc seems to vary from one side to the other? I.e. it is about 1-2 degrees more on the right compared to the left.
The tyre pressures on one side is consistently 10kpa (1.5 psi) higher than the other. Is this to compensate for point 2?
What would the recommended tire pressures be for the Michelin PS4s? Is it the same as the fuel door stickers recommended tire pressures?
I have the Michelin Ps4s on mine. I use 38psi f and 36psi r for 255/35f and 295/30r 19’s. I found that best for my driving style and in Socal weather. I tell my service advisor not to touch my tire pressures when I take my car in for service.
I’ve noticed the TPMS may not be accurate all the time, so I go by what my tire pressure gauge says. I tried taking measurements with the tire warm and one of the tires show a higher pressure on the dash display, even though my pressure gauge says they’re equal f/r.
I have the Michelin Ps4s on mine. I use 38psi f and 36psi r for 255/35f and 295/30r 19’s. I found that best for my driving style and in Socal weather. I tell my service advisor not to touch my tire pressures when I take my car in for service.
I’ve noticed the TPMS may not be accurate all the time, so I go by what my tire pressure gauge says. I tried taking measurements with the tire warm and one of the tires show a higher pressure on the dash display, even though my pressure gauge says they’re equal f/r.
Your tyres aren’t oem right? I thought OEM was 225 and 245
Your tyres aren’t oem right? I thought OEM was 225 and 245
Nope, they’re not OEM, and neither are Ps4s. I had to play with different tire pressures and taking corners at the speed I like and going on the freeway for long drives to see how high the pressures go, cold and warm temps. Also went on “not so” smooth roads, to see which pressures give me the most “tolerable” ride. I ended up with 38/36 psi f/r.
You’ll have to look for your “sweet spot”. Once you get the right tire pressures for you, keep it at that. If you forget to tell your service advisor, just put it back to the psi’s you like once it cools down.
Nope, they’re not OEM, and neither are Ps4s. I had to play with different tire pressures and taking corners at the speed I like and going on the freeway for long drives to see how high the pressures go, cold and warm temps. Also went on “not so” smooth roads, to see which pressures give me the most “tolerable” ride. I ended up with 38/36 psi f/r.
You’ll have to look for your “sweet spot”. Once you get the right tire pressures for you, keep it at that. If you forget to tell your service advisor, just put it back to the psi’s you like once it cools down.
Do you have any thoughts on the differing camber, toe in and caster? Also the different pressures from side to side
Do you have any thoughts on the differing camber, toe in and caster? Also the different pressures from side to side
i've had a dealership straight up tell me that higher tire pressures reduce the chance of the rims bending and thus why they do that.
as far as alignment - there's little to no adjustment. set toe equal and the other values should fall within tolerance - which will not be perfect. my passenger side seems to take more time to catch up warming up - but eventually will be perfectly balanced after fully warm
Do you have any thoughts on the differing camber, toe in and caster? Also the different pressures from side to side
I've found the tire pressure on the side of my car that is near the windows in my garage with the sun shining on that side of the car is about a pound or so higher then on the side of the car that is away from the garage windows.
Do you have any thoughts on the differing camber, toe in and caster? Also the different pressures from side to side
Unfortunately, camber cannot be adjusted on this car. When I dropped the car, we pulled out the camber bolt to see if the bushing had a nipple to allow adjustments, but it didn’t. Unless you get a camber kit like k-Mac, only toe can be adjusted.
My observation on side to side pressures makes me suspect it’s an error on the TPMS, or maybe caused by the orientation of the disc brakes. If you notice, the front discs aren’t true directional. I always thought that was the cause of one of the tires reading 1-2lbs. higher on the dash. However, when I check it with a gauge, the tire pressures are the same, while the dash says one tire is 1lb higher... usually the passenger front (driver’s side front if you’re right-hand drive).
I have the Michelin Ps4s on mine. I use 38psi f and 36psi r for 255/35f and 295/30r 19’s. I found that best for my driving style and in Socal weather. I tell my service advisor not to touch my tire pressures when I take my car in for service.
I’ve noticed the TPMS may not be accurate all the time, so I go by what my tire pressure gauge says. I tried taking measurements with the tire warm and one of the tires show a higher pressure on the dash display, even though my pressure gauge says they’re equal f/r.
Can you tell me which offset and size are your wheels?
just the road... hahaha!
if i speed up on big dips with a passenger it rubs the felt-like inner liner. Other than that i can pretty much drive around and pretend i was Lewis Hamilton...
It’s documented on the c450/43 wheel fitment guide thread. Post 181
just the road... hahaha!
if i speed up on big dips with a passenger it rubs the felt-like inner liner. Other than that i can pretty much drive around and pretend i was Lewis Hamilton...
It’s documented on the c450/43 wheel fitment guide thread. Post 181
12-12-2019, 12:33 AM
