275/30zr20 pzero tire pressure for RS5

[PeregrineNYC]

What do folks feel their ideal pressure is in the RS5 for this tire?

[Skywagon]

I run 38 PSI.

[PeregrineNYC]

Thanks - door says 44-41. I'm not exactly sure what's best.


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[Skywagon]

Thanks - door says 44-41. I'm not exactly sure what's best.


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That's too high in my opinion. Do what the door says and you can always let some out?

[PeregrineNYC]

That's too high in my opinion. Do what the door says and you can always let some out?

I suppose. My car (and tires) are brand new, so am just curious what folks are doing. Thanks

[VanquisherRS5]

I run the pressures on the door. I felt the handling was not as good when the pressure dropped if anything I could always feel when the tire pressure was low. I don't think they would put the pressure on the door if there was a danger. Not sure where people decide its "too much"

[Jimmy ny]

I run 1 pound over and find its very noisy on some roads. I run the all season version of this tire.


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[superswiss]

As the user manual explains on page 223, there are two recommended tire pressures. There is normal load for up to 2 occupants 39f/35r and full load (which is also whats printed on the door) 44f/41r. In the US due to some stupid regulations, only the full load pressure is listed on the door. If you've ever been to Europe, you may know that the door sticker in Europe lists both pressures and also pressures for different tire sizes.

While the ride is noticeably more comfortable at 39f/35r, like VanquisherRS5 I don't like the handling at all at the pressure. The steering gets funky and the car looses its sharpness. I tried several different pressures between 39f/35r and 44f/41r, but it was always the same. I can tell if the pressure is below 44f/41r by as little as 1 psi. Generally the problem with the full load tire pressure is that you get more tire wear in the center of the tires unless the car is loaded down, however, I'm on my third set of tires and that really hasn't been an issue. I've always been using the full load tire pressure, even on my previous cars. I do drive on the hard side and I prefer sharp handling over ride comfort. Strangely I find the ride at 44f/41r actually more comfortable in a weird sense. It bounces less and settles quicker when driving over less than pristine roads. I don't know what it is, but I dislike bouncy suspensions. The impacts are harsher at 44f/41r, but the suspension settles quicker.

[JamesRS5]

Superswiss, maybe try a stiffer side walled tire, you could run the lower pressure to preserve rubber but maintain the firm ride you prefer.

I'm a little confused to your suspension reacting differently at higher tire pressures, the suspension will react the same, it's probably the flex in the tire you're feeling?

I'll post a picture up tomorrow of the Euro Spec tire pressure door label, there's a few different pressures for full load, light load and mud and snow tires. I run mine at 39/35 and enjoy the ride but I usually have my DRC selected to 'comfort' and I have the Eibach springs which give a softer ride.

One thing I will say, check the tire pressures now the temps are cooling. We've dropped 10'C in the past two weeks and my pressures were down 1.5psi on all four wheels, ambient temperature really can make a difference.

Out of interest, when do you guys check your tire pressures? Cold before driving or at normal running temperature after a drive?

[superswiss]

I have the P Zero which have a pretty stiff sidewall. That's one reason I like them.



Yeah its the tire that adds additional bounce. However that affects how the suspension performs. The suspension will take more of the impact if the tire is stiff, whereas a softer tire absorbs more of the impact before the forces are transferred to the suspension.



I check my tire pressure every two weeks first thing in the morning after the car had all night to cool down in my garage. I'm usually about 1 psi low after two weeks and I can tell. I might start checking every week.

[Runge]

Superswiss, maybe try a stiffer side walled tire, you could run the lower pressure to preserve rubber but maintain the firm ride you prefer.

I'm a little confused to your suspension reacting differently at higher tire pressures, the suspension will react the same, it's probably the flex in the tire you're feeling?

I'll post a picture up tomorrow of the Euro Spec tire pressure door label, there's a few different pressures for full load, light load and mud and snow tires. I run mine at 39/35 and enjoy the ride but I usually have my DRC selected to 'comfort' and I have the Eibach springs which give a softer ride.

One thing I will say, check the tire pressures now the temps are cooling. We've dropped 10'C in the past two weeks and my pressures were down 1.5psi on all four wheels, ambient temperature really can make a difference.

Out of interest, when do you guys check your tire pressures? Cold before driving or at normal running temperature after a drive?

always check tires at cold temp! (if outside drops 10-15-20 degrees let the tires get used to the new temp a check again)

if you check when hot, your tires will be 4-5-6-7psi higher than cold.

[JamesRS5]

I'm a cold checker too but I was doubting my technique last week, surely a pressure check when the tire is at operating temperature would be better?
But then how do you know you're correct, a tire at a lower pressure may heat up more so increasing the tire pressure. My final conclusion was to check them cold to ensure the cold temps are good, then check again after a drive to see what the pressures are reaching when they are at running temperature.

[PeregrineNYC]

I just checked mine cold and they are 35/35. I think too low on both counts so I am going to go at least 42 in front and 40 in rear to see what that does. Very helpful insights above, btw. Thanks

[Jimmy ny]

Check first thing in morning. 35 is way to low.


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[PeregrineNYC]

35 is what my dealer left me with - I just brought them up to 42-40 ish. we'll see what happens.

[JamesRS5]

35 is on the money for the rears, you need to be taking the fronts up to 39 - 40psi though.