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Discussion Starter · #1 ·
After doing some research for the Sorento on rotational mass and unsprung weight I came across as discussion on Tire Pressure vs Rolling Resistance.

Tire inflation pressure seems to be another variable that most do not address on a regular basis. I am now running my Sorento and Koup at 40psi and I can say it doesn't have to work near as hard to move the vehicles. What a difference @ part throttle--especially in the higher gears. The car just feels easier to push.

The articles I read said that most SCCA cone racers run this setup on both street and strip. I am sold.

PS: Look at the MAX Inflation Pressure on the side of the tire. In this case I went 9-10psi under the limit for safety. It should be noted that the articles spoke of alignment techs using max inflation Pressure to properly align the wheels.
 

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Look at the door placard and see what the reccomended psi is which I believe that it's 32 psi and if you over-inflate the tires and run that for a long period of time you will ruin your tires and completely wear out one half of your tread and not the other which means new tires alot..
 

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Discussion Starter · #3 ·
Look at the door placard and see what the reccomended psi is which I believe that it's 32 psi and if you over-inflate the tires and run that for a long period of time you will ruin your tires and completely wear out one half of your tread and not the other which means new tires alot..
Have you heard the news? Other cars with these exact tires running 32psi only make it to 30K. Tires over 30K are ugly and have to go on my vehicles anyways!!

Besides, Like other SCCA racers these are *my tires* and I choose performance and ecomomy (increased MPG) over all tire life. The car is much more responsive now in acceleration and handling.
 

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I checked mine today and they were at 40psi from dealer except one was at 30 so I topped it up.
 

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I was just sayin my peace that's all... Each to their own lol... I just know mine were over-inflated from the dealer and my fronts are down to to 6 and my rears are at seven and I only have 1300 miles on them... I'm gonna talk to the dealer about it and hopefully get a new set casue they shoud be no where near that low already...
 

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What was the new tire measurement? Usually they aren't 10. Maybe stop by dealer and check a new car.
 

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Discussion Starter · #7 ·
Oh, I almost forgot...

The rule is 1psi per month per tire of leakage if not corrected. My Miata has sat for a many months and was down to 19psi from 30psi. You have to stay on Tire Pressure 1-2 times a month minimum.

The Sorento benefited the most from this exercise as it has 20x9.5's.
 

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well ive had a nail in my tire on 2 seperate occasions, one being today... yes today, and my tread is also low. ima try to do the same and complain to get new ones. im so frustrated. lol got my little donut p.o.s spare on now. so sexy
 

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Good god, I can't image how harsh the ride must be with 40 psi in the tires.
This thing is like riding on round bricks at the recommended pressure. I have rattles all over the place and I think some of that is due to the horrible beating the car takes over even the smallest of bumps. This thing has a horrible ride. I have a Corvette and have had other sport cars over the years, which the Koupe is not. The Koupe's ride is not a compromise for handling response. The rough ride in this car is inexcusable. I know what I bought and am very satisfied with the Koupe, just my opinion on the ride quality. Didn't mean to get off-topic, just thinking out loud.
 

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I have no issue with a rough ride at 40psi. It rides smooth but it is an EX so doesn't have the SX rigidity.
 
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