1. what is the best tire pressure for corolla 2003 tires for a smooth and comfortable drive without any bumpy feelings.
2. My suspension is perfectly fit and having factory alloy rims, but totally not satisfied with a drive, it gives sometimes bumpy drive, sometimes between 100-110km/hr, it's not that smooth after 115-120 kms/hr, it becomes better.
1) Start with the factory-recommended pressure. That is, 30 PSI front and 30 PSI rear (30/30). I've tried a few different air pressure settings on mine. I've run the stock 30/30, I've tried 32/30, I've tried 35/35, I've tried about 35/32. In the end, I've gone back to the stock 30/30. Interestingly, there was really no measurable increase in fuel economy as I went up in pressure, and it seems that I've gotten my best mileage at the stock 30/30. That's with alloy wheels from a Prius and Yokohama Avid TRZ tires.
2) It sounds like you're talking about tire balance. Air pressure will not generally hide the symtoms of bad balance, although it can help if your tires are out-of-round. What kind of tires are they, how old are they (age, miles), and did you have them installed, or did you buy the car with those tires on it?
1) Interestingly, there was really no measurable increase in fuel economy as I went up in pressure, and it seems that I've gotten my best mileage at the stock 30/30.
2) What kind of tires are they, how old are they (age, miles), and did you have them installed, or did you buy the car with those tires on it?
1. It's interesting. But you did that for a smooth drive or for fuel eceonomy. I am having hard time with these new tires.
2. These are Kumho Radial tires installed about a month and a half. I bought this car installed with these new tires. As what i read on your other post, is it really a problem with new tires or are belts inside are broken/slipped, if we buy tires from a non-reputable or a cheap tire store carrying B Pair or defective tires.
I put the air pressure back down because of the harsher ride. There are no vibrations at speed, but around town, stuff like railroad tracks and frost heaves are much harsher as the pressure increases. I set mine back at 30, expecting a hit in economy, but it's really better than it's ever been, set at 30 PSI.
Tire pressure should always be checked when the tires are cold, which means the vehicle must parked for at least 3 hours minimum. i check my tire pressure early in the morning in the garage. If you do not have the gauge to check the pressure go to the nearest gas station (within a mile) and check/inflate the tire to get fairly accurate reading. If the pressure is checked when the tire is hot you always will get exaggerated pressure as heat causes expansion.
Under inflated tires tend to wear out the outer most edges and over inflation tends to wear out in the center. Both are unacceptable. Incorrect tire pressure also leads to inefficient braking/handling. Try to keep the pressure within the specified limits for the particular tire as recommended by the maker. In wet weather correct tire pressure is even more important.
Under inflated tires can rob you of those MPG's (about 3 %), you bought the Corolla for the MPG didn't ya?
1. It's interesting. But you did that for a smooth drive or for fuel eceonomy. I am having hard time with these new tires.
2. These are Kumho Radial tires installed about a month and a half. I bought this car installed with these new tires. As what i read on your other post, is it really a problem with new tires or are belts inside are broken/slipped, if we buy tires from a non-reputable or a cheap tire store carrying B Pair or defective tires.
Kumho are in my opinion slightly noisy tires, cheaper tires tend to have this problem which maily has to do with the tread pattern. Michelin is probably the quietest tire one can buy, especially the more expensive ones. Bridgestone did well in the early 80's to improve upon this phenomena by copying tread patterns from Michelin and putting it through computer and coming up with their own variation. They called it RCOT (Rolling Contour Optimizing Theory), for Bridgestone it was just the theory but for Michelin they already had perfected it. If you like quiter tires go for Michelin or Bridgestone.
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