Quote:
Originally Posted by chucky norris
ok here is the story...i have always ran federals on my car and i decided to change it up a bit so i bought some new tires (rear:delantes front:haankook) yesterday. it feels way different, i can feel more roll with these tires. The rear tires grip way to much and my car feels heavier then before (clutch kicked it), do i just need to bump up the psi?
my set up
stock sr
welded diff
i am on some 17x9 225/24/17 all around
45 psi in the rear
i have no idea what the psi in the front is
|
so instead of me telling you what your car is doing, i'll explain what you are feeling and why.
so regardless of the front tires. Lets focus on the rear tires.
Imagine drag cars. Soft rear suspension so that when the power is put down, the suspension absorbs the shock, and allows the power to be put down.
There is your answer on the rear tires. Federals have a "SS" steel sidewall, which means that when you hit that throttle, it has very little compression. So when you put a tire on there that has a softer sidewall, it's going to compress and give grip. Raising the tire pressure would allow for less compression. And at the same time, the tire with more tire pressure inflates like a balloon. The contact patch gets more narrow, allowing for your width of your tire to narrow a little bit.
You feel the car sway, because the sidewalls are now compressing under load. So if you pay really close attention, there will be a split second of turn in where you don't have response, and then all of a sudden you get this huge amount of rear grip. The second you shift the weight of the car to the other side, you'll have a bigger delay....cause now that tires compression has to travel past the center point, and to the other side before it compresses. Just like your suspension under weight transfer.
As far as the front tires, it really only makes a difference in turn in and mid-drift traction. Alignment settings can make this setup feel better, but at the same time, you work with what you can.
Air up that pressure, and have some fun, just understand, more air..makes it feel like you are driving in the rain. So be careful. ;D