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Sedans Chevrolet Cobalt Chevrolet Cobalt
2164 messages, Last post on Nov 05, 2009 at 5:08 PM
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Replying to: sseiboi (Nov 16, 2008 7:21 pm)
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Replying to: calypso3 (Nov 23, 2008 6:12 pm) With the factory tires, a Cobalt's recommended cold tire inflation pressure is 30 psi. Cold pressure is when the vehicle has been driven less than five miles. The ambient air temperature will affect tire pressure, so it is necessary to add some air in the winter. Tom
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Replying to: tsjay (Nov 24, 2008 8:01 am) |
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What you are looking for in determining the proper tire pressure is a good "footprint." That means that you want the tread to be in contact with the pavement all the way across the width of the tire. Over inflation makes only the tread in the middle of the tire contact the pavement, and the tire will wear in the middle. Under inflation makes only the tread on the inside and on the outside of the tire make contact with the pavement, and this will also cause uneven tire wear. Some people actually go to the trouble of using chalk to check the footprint of their tires. You can rub some chalk across the width of the tread and then drive a few feet. Check the imprint of the tire where the chalk made contact with the pavement and see if it looks uniform. I don't know of anyone personally who does that, and I am not recommending that you should, but it does give you a clear picture of what you are looking for in determining the proper tire pressure. Once again, the weight of the vehicle is a HUGE factor in determining the proper inflation pressure. With the same tire, a heavier vehicle will require a higher pressure. For example, I have some BFG Mud Terrains on my Jeep Wrangler, and the maximum tire pressure indicated on the tires is 50 psi. I run 28 psi for a good ride and for good handling, but Jeeps don't weigh very much. On a big truck, those tires might need to be run at 40 psi. I would just go with the pressure recommended by the vehicle manufacturer, especially when running original equipment tires. Tomster |
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"In the snow, you are required to run a higher pressure due to the fact that the tire present friction in snow dramatically if low." Sseiboi: What are you trying to say here? That the higher the tire pressure, the lower the friction and less traction? Or the higher the tire pressure the higher the friction on the smaller footprint and the better the traction?
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Replying to: tcalof (Nov 25, 2008 6:51 am) Imagine the tire as a balloon. When you first blow it up, it looks flat and a little mishapen. as you add more air, it becomes rounder and solid. Same concept. |
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I sure wish my little Cobalt had cruise control, but it was the last one on the lot at the time, and I decided to take it, even though it didn't have this feature. I didn't realize how much I would miss it. I have checked a couple places that install cruise, and the prices were $395 at one place and $425 at another. Is that the going rate? I didn't realize it would cost so much. I was thinking maybe $250 to $300. Any suggestions? Tom
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Replying to: tsjay (Nov 25, 2008 7:16 pm) It would be worth asking for me. It might be worth getting a factory service manual form Helminc.com if you're good at reading wiring. Then you could get parts from a recycling yard from a donor Cobalt...
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Replying to: imidazol97 (Nov 26, 2008 6:00 am)  I have checked with the dealer, and they referred me to one of those places that I menitoned in my first post. Tom
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Replying to: tsjay (Nov 26, 2008 9:36 am) Rostra is a brand that seems to make a lot of these.
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