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New tires but car doesn't feel right(too loose)

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Old Dec 26, 2016 | 08:16 PM
  #1  
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2015 C63S
New tires but car doesn't feel right(too loose)

Just had new super sports put on but car feels too loose. What pressure should I be running? Not sure what to make of sticker on gas door. See attached
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Old Dec 26, 2016 | 11:12 PM
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2016 C63S Sedan
38f --33r
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Old Dec 27, 2016 | 01:18 AM
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The dealer set them at 33 front and 30 rear so that would explain it.
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Old Dec 27, 2016 | 01:42 AM
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Originally Posted by bigmanoncampus
The dealer set them at 33 front and 30 rear so that would explain it.
​​​​​​
I doubt that is it. That is a minimal difference in pressure and it would be very difficult to feel.
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Old Dec 27, 2016 | 10:21 AM
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Originally Posted by Dthquazi
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I doubt that is it. That is a minimal difference in pressure and it would be very difficult to feel.
If someone was paying attention while driving, they'd easily feel the difference between 33f/30r and 38f/33r. With the front tires that under-inflated, the front end of the car would feel significantly lazier in its responsiveness.

Personally, I like to run my tires at 40f/36r. The front end feels responsive yet still compliant, and the rear end feels a bit more lively.
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Old Dec 27, 2016 | 01:52 PM
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Originally Posted by msd3075
If someone was paying attention while driving, they'd easily feel the difference between 33f/30r and 38f/33r. With the front tires that under-inflated, the front end of the car would feel significantly lazier in its responsiveness.

Personally, I like to run my tires at 40f/36r. The front end feels responsive yet still compliant, and the rear end feels a bit more lively.
agreed.

I lessened my tire pressure thinking it would help reduce vibration from an out of balance and bent wheel and all it really did was make the front end feel extremely vague.
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Old Dec 27, 2016 | 04:21 PM
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Originally Posted by msd3075
If someone was paying attention while driving, they'd easily feel the difference between 33f/30r and 38f/33r. With the front tires that under-inflated, the front end of the car would feel significantly lazier in its responsiveness.

Personally, I like to run my tires at 40f/36r. The front end feels responsive yet still compliant, and the rear end feels a bit more lively.
As you can see after driving awhile the pressure goes up several lbs. And even more if it is spirited driving so do take that into consideration when going up from the suggested cold numbers.
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Old Dec 28, 2016 | 08:55 AM
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Originally Posted by RDOCA
As you can see after driving awhile the pressure goes up several lbs. And even more if it is spirited driving so do take that into consideration when going up from the suggested cold numbers.
I'm well aware of how to measure tire pressures....
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Check your alignment !!! mine had a similar issue and it was that
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