Before I filled up my tires on my 98 GT Auto to 45psi I was able to squawk the tires in second gear. No I noticed that since I have filled them up to 45psi from 29psi I am not able to squawk in second gear anymore. Does the tire pressure have anything to do with this? I have also noticed that before when I was able to squawk them the weather was warmer out, now that it is a little cooler it isnt doing this.

 

For me, colder = less traction + more power... so it's obvious there's going to be a bit more tirespin. Having them up at 45 psi is excessive, what size are they? They were probably only contacting in the middle while overinflated.

245/45-17 tires should be in the neighborhood of 30 psi, some higher, some lower. I run mine at 30 cold, so they get up to 36 or so hot. For auto cross, I pump them up to 36-38 cold... I only do this because these tires have really soft sidewalls and they roll under at "normal" pressure... otherwise they'd stay at 30.

Edit: My 295/35-18 saleens for the rear had to be at 42-46 cold for normal pressure, ridiculously high.

 

I have 275/40/17 in the rear and and 245/40/17 in the front, there max psi rating is 51.

 

i chirp tires going into 3rd on 25psi nitto 555's street's

 

those tires can go on many vehicles, just because the max is high does not mean fill em up high. Just put em anywhere between 30-35, youll be okay.

 

oh yea well since i got my 4.10's put in i have chirped 4th gear twice on nitto 555's...oh!

 

that's because with the lower psi, it's not like driving on solid rubber. 45psi is insane! [&:]

 

I don't know why no one has said this yet, but if you don't chirp in any gear, that's good! That means that your car is connecting with the road and you drive it right. Just because you don't chirp the tires, doesn't mean your car's weak. It could just mean that your tires were gripping the road particularly well at the time. That and/or you weren't giving it enough power or shifting the same way. I don't see it as a bad thing, though, if my tires don't chirp. That just means less time the tires spin when they don't have to(aka: better 1/4 times)

 

Theres a reason why the car is supposed to have 32 psi in front/back. The designers meant for the car to be put on tires with that amount of pressure for ride/handling/safety reasons. The tire is part of the suspension and anyone who took auto class in highschool can dig up their old book and confirm this. Even if you have low profile tires you should still air to the doorsticker. The 32 psi in low pro tires is too little point is moot. 32 psi in a low pro is 32 psi in a 50 profile is 32 psi in an 80 profile tire. It's like saying a pound of feathers is heavier than a pound of lead.

Sorry, but I had to say it because I work at a shop and I see way too often people come in on tires that have 80 psi in them and their reason was because "the tire looked flat because it was bulging at the bottom". ITS SUPPOSED TO BE THAT WAY. If you don't want the bulge go buy some ancient bias ply tires and you won't have that problem.

If you don't mind the harsher ride with the extra air in your tires and your tires are rated to hold that much air then I don't see how it would hurt, except wearing faster down the center.

 

putting 45psi in your tires is a very BAD thing. the more air you put in them the more they will look like a rainbow when looking directly at the tread. The center of the tire will begin to bow out and only that part will hit the ground, not to mention if you hit any kind of pothole the pressure on those tires in really high and your gonna blow out! Also, when you drive down the highway, your tire pressure rises because of heat. It expands. Your tires pressure is like 48-49psi driving down the highway. BAD, BAD, BAD! Now the less air you put in your tires, the center of the tire dips in causing you to wear the outsides of your tires. Just put 30-35psi and call it a day.
I run 18" rubber and put 34psi up front(cornering) and 32psi out back.(traction)