Tires pressure.

Chan Chee Hoe

I know that,but i tried 40 PSI & feels better,i wonder any people here pumped 40 PSI to their cars.?

NXTAZEE

When I picked up the car it had 45 psi and it was a very rough ride. I have 35 now which gives good traction as well as a smother ride. I may try a little less to see how that feels.

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Island_370

Better economy is coming at a sacrifice. Potentially higher tire wear (not using the tire surface evenly) and potentially of braking performance--the easy two sacrifices.

I would rather get 2 fewer mpg then have to buy a front bumper because my braking distance is increased in an emergency situation. Do a search on the risks of "hypermiling", most have a section on higher tire pressures.

You can do what you want and likely you will never need to use the brakes at their max on the street. But to me, the risk ain't worth it.

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OldGuy

When I brought my car home from delivery, I checked the pressure and it was 40 PSI and I attributed it to idiots at the dealership not knowing what they were doing when they prepped the car. I immediately had the pressure adjusted to the numbers on the jam and have kept it that way since simply because I assume the Nissan people know best. But now I'm going to say the dealership set those pressures at 40 not out of incompetence but for a reason. I like to give people the benefit of the doubt.

Modshack

Cause they couldn't read the door Jamb sticker?

Seriously, most car and tire combination's have a sweet spot they work best at. Different tires than engineered and spec'd on the car may have softer or stiffer sidewalls that may require a change in the pressures. IMO the factory recommendation with these tires are pretty spot on. Raising them to 40 will result in a reduced contact patch, sketchier braking and traction, and odd tire wear patterns.

The Tyre Bible is always a good read if you haven't done so:
Car Bibles : The Wheel and Tyre Bible Page 1 of 4

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