Car feels loose

[chaoskaze]

Originally Posted by Celica00

I'm bored so here we go. Converting the OEM tire 215/45/17 dimensions to inches would be ~8.5in x 24.5in. Get the area of the circle with pi x radius^2 => 3.14 x 12.25^2 = 471.2. Then volume of a 8.5in cylinder 471.2 x 8.5 = 4005.2

Now minus the rim area which is about 1928.4 making the area of the tire about 2076.8 cubic inches or 1.2 cubic feet

Let's compress this shit to idk what max is... 51 psi?

(psi x cubic feet)/ earth's atmosphere pressure

(51 x 1.2)/14.7 => 4.16 cubic feet per tire x 4 = 16.64 cubic feet

Each cubic foot of helium has a lift of .069 pounds.

If my partially drunk math is correct, then .069 x 16.64 = 1.15 pounds of lift.

Totes worth.

Fkn Aced it, high five please?

[MarkR171]

Originally Posted by Celica00

I'm bored so here we go. Converting the OEM tire 215/45/17 dimensions to inches would be ~8.5in x 24.5in. Get the area of the circle with pi x radius^2 => 3.14 x 12.25^2 = 471.2. Then volume of a 8.5in cylinder 471.2 x 8.5 = 4005.2

Now minus the rim area which is about 1928.4 making the area of the tire about 2076.8 cubic inches or 1.2 cubic feet

Let's compress this shit to idk what max is... 51 psi?

(psi x cubic feet)/ earth's atmosphere pressure

(51 x 1.2)/14.7 => 4.16 cubic feet per tire x 4 = 16.64 cubic feet

Each cubic foot of helium has a lift of .069 pounds.

If my partially drunk math is correct, then .069 x 16.64 = 1.15 pounds of lift.

Totes worth.

If you put a BRZ with tires filled with helium on a treadmill that moves in the opposite direction at the same speed, will it take off?

[Riftur]

Originally Posted by Spuds

Please read the whole post you quoted. I said you had wider tires than stock. I then stated that meant I would want to run a slightly lower tire pressure than stock if in the same situation.

I'm asking because there was perhaps something else I am missing as to why somebody might increase tire pressure. Either you had a good reason or didn't. Usually I ask questions assuming the former. Your responses thus far have indicated the latter.

Usually people run higher tire pressure for better gas mileage. Which I was trying to find a happy medium.

[Riftur]

Originally Posted by Tcoat

40 degrees.
In Florida where that is very unusual.
Even at proper inflation on the best of tires they are going to feel very strange to him.

This what I think it was. This morning the temps were back to normal and the car felt normal also. I think between the road and tires being at temps we never get down here, it felt loose compared to what I am used to.

[Tcoat]

Originally Posted by Riftur

This what I think it was. This morning the temps were back to normal and the car felt normal also. I think between the road and tires being at temps we never get down here, it felt loose compared to what I am used to.

Yep. It is that simple

[Riftur]

Originally Posted by mav1178

The reason why people say you don't understand what max PSI stands for is because you post things like "should i put it back to 51".

You solicited the responses by clearly posting a response that shows your lack of understanding.

FYI in case you want to defend yourself in the future.

The reason I said that was that I have never had a tire with a max PSI of 51 besides one of those mini spare tires which have much higher PSI levels.

[Riftur]

Originally Posted by Tcoat

No. The max pressure is written on the side of the tire. The recommended pressure is written on the door frame of the car. That recommendation is for any tires that are installed but it is only a recommendation. You can and should vary the pressure based on what you are doing to the tires.

This is why I did not think I could go by what was written on the side of the door since its not stock. I did not realize it was for any tire put on the car. I never had tires with that high of a max and always kept my psi at 35-38

[WNDSRFR]

Can't believe I read through 6 pages of this crap.
Just let some air out of the tires and your problem will be solved. it's really not that complicated.
I would try 32 PSI. I'll bet it handles MUCH better.

Max PSI? You gotta be kidding me!

[Riftur]

Originally Posted by WNDSRFR

Can't believe I read through 6 pages of this crap.
Just let some air out of the tires and your problem will be solved. it's really not that complicated.
I would try 32 PSI. I'll bet it handles MUCH better.

Max PSI? You gotta be kidding me!

Just so you know I never had my car maxed at 51. I just used the wrong words. The shop who services my car added the air. I assumed they knew what they were talking about.

[dinfern22]

That explains it!
I bought Michelin Pilot Super Sports a couple months ago and now it's gotten real cold with a bit of snow here in Maryland, and ever since my tires would lose so much traction, from a light to stepping on the gas.

This was my first summer performance tire and I had no idea it was this bad! Couldn't even drive a couple inches without the tires spinning in light snow. Even my primacy's were good in snow in comparison.

Is it normal for summer performance tires to lose traction on roads with salt with somewhat cold weather?

[StraightOuttaCanadaEh]

Originally Posted by dinfern22

That explains it!
I bought Michelin Pilot Super Sports a couple months ago and now it's gotten real cold with a bit of snow here in Maryland, and ever since my tires would lose so much traction, from a light to stepping on the gas.

This was my first summer performance tire and I had no idea it was this bad! Couldn't even drive a couple inches without the tires spinning in light snow. Even my primacy's were good in snow in comparison.

Is it normal for summer performance tires to lose traction on roads with salt with somewhat cold weather?

omg why do you have summer tires on in the winter?! lol

I take mine off in october and put them back on in april or so. They have a fairly unforgiving operating range. They do well in wet weather (more so when they're newish), but the tread pattern is not blockish enough to grab onto snow covered roads. There is nothing to displace snow. If you look at the tread blocks on your tires, they're rounded off. Winter tires have square blocks with plenty of space in between. In cold temperatures, they get real hard too and you're actually harming them.

[stevesnj]

Originally Posted by StraightOuttaCanadaEh

omg why do you have summer tires on in the winter?! lol

We all cant afford to buy seperate tires here in the states for different seasons. No matter what Cheeto Jesus says the economy isn't good to all American's. We have to live in the winter with Prius tires.

[Tcoat]

Originally Posted by dinfern22

That explains it!
I bought Michelin Pilot Super Sports a couple months ago and now it's gotten real cold with a bit of snow here in Maryland, and ever since my tires would lose so much traction, from a light to stepping on the gas.

This was my first summer performance tire and I had no idea it was this bad! Couldn't even drive a couple inches without the tires spinning in light snow. Even my primacy's were good in snow in comparison.

Is it normal for summer performance tires to lose traction on roads with salt with somewhat cold weather?

The cold affects tires far more than snow. The summer performance tires are designed hard so that in hot weather they soften up for traction. Anything even approaching freezing can firm them up into hockey pucks. All season tires deal with the cold a little better but are of course a compromise between being hard and soft so that they can deal with a wider range of temperatures. Winter tires are very soft so that when it gets cold out they can still retain traction even though they do firm up. Earlier in the year We had a run of sub zero temperatures here (-4 to -6 Fahrenheit) where even my winter tires got hard enough to lose traction on bare pavement.

[Tcoat]

Originally Posted by stevesnj

We all cant afford to buy seperate tires here in the states for different seasons. No matter what Cheeto Jesus says the economy isn't good to all American's. We have to live in the winter with Prius tires.

Explains the high insurance rates there.