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|8th April 2007, 09:19||#16|
Join Date: Jul 2006
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31-32psi should be correct if 33psi is hard.
During highway driving yes due to the heat air inside expands causing an increase in pressure. This is ok. If you underinflate for highway you increase the rolling resistance and friction increases causing more heat which is not good. The increase due to the heat is nothing to worry about and there really is no need to compensate for that.
|10th April 2007, 05:29||#18|
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Well, for most Indian cars, 28-33 psi is enough. If you are using the same size rim, I would think you can persist with the same pressure. Also, use your gut feel. If it's too bouncy, depressurize, and vice-versa.
Ishan, is there a more technical way?
|11th April 2007, 20:05||#19|
Join Date: Sep 2006
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whatever the pressure choice, be sure that u get it inflated when the tyres are not hotter than normal outside air temperature (not ground temprature), driving a car even for a short distance heats up the tyres and you will never get a desired pressure or an even pressure in all the four tyres, best would be to check it at the nearest centre early in the morning or during servicing or alignment, provided the service and alignment intervals are not too long.
|9th May 2007, 19:08||#20|
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I got a suggestion to hav 30 psi on all tires from the dealer for my bridgestone potenza 165/60 R13. But in effect he filled it with 30, 31, 32, 30 etc on 4 tires (1 different from other). It caused a bumpy ride and luckily my air pressure gauge helped me to check each one and correct it back to 29 psi on all tires. Now its comfortable and gives more road grip and steering ease. Its always better to try variations of 29, 30, 31 (same psi on all tires) at each filling and decide which suits your tire and vehicle. Even the suggested psi marked inside the vehicle need not be true when it comes to comfort and riding quality. So, personalise after checking different measurements.
|9th May 2007, 20:35||#21|
Join Date: Feb 2004
Location: NYC / BOM
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whenever you guys measure tyre pressure please make sure that no two gauges are alike - there can be a 10% disparity in readings shown by different gauges.
the variations in readings change with ambient conditions.
eg. say at 22deg C, gauge 1 reads tyre pressure as 30psi but gauge 2 reads the same tyre pressure at 33psi.
if the temperature rises to 28deg C- gauge 1 might read 31psi but gauge 2 might read 35psi at the same time.
if the temperature drops to freezing conditions, the errors magnify and readings may vary over +-6psi.
i've checked this personally -compared readings using an analog gauge in a Pep Boys garage, a digital Michelin digital gauge, a Sears digital gauge, an Accutire digital gauge, and another local digital gauge (i forget the make).
there are a couple of calibrated gauges available - they're mainly analog and expensive compared to the ones widely available - you can check them up online via any search engine.
|25th February 2008, 15:06||#22|
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My experience is, in my Cedia, Bridgestone Potenza (stock tires), the dealer's serviceman kept 30 psi (per mark on the car), the ride was too bumpy and even car was rattling like hell over rough and bumpy roads (most of the time I drive alone in the car).
Then I cut back to 28 psi and the car ride totally changed. Though mileage will not change siginificantly, the ride is great with me and one passenger.
The recommended tire pressure is mainly for 5 people in the car with some cargo.
So, its better to decide the potimum pressure based on -
- How many people in the car.
- Ambient temperature (over inflating in a hot season is inviting danger of tire burst during harsh braking).
- Cargo and speed (for higher speed, you need to go up by 2-3 psi).
My experience Folks!!!
|26th February 2008, 00:01||#24|
Join Date: Jan 2008
Location: Heerlen, The Netherlands, EU
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Nice thread! Here in Europe "over inflating" tyres is actually recommended!
That is, if you're on fast "autobahn" roads, most of the time. Those roads
tend to be "podhole free". Since one is allowed to drive 120 to 130kmh,
or even more (in Germany) on these roads, slight "over inflating" really does
improve things. Improved fuel efficiency, less wear & tear (less heat), and more important, better performance due to lowered resistance.
My Maruti Zen tyres (Pirelli P3000) should be filled up to about 27~28 PSI
on the front and about 29 PSI on the rear. I'm running them with 30.5 PSI
on the front and 32PSI on the rear.
I must admit, though.... of the higway, in France (where roards can be pretty bad) I use the stock PSI.
|4th October 2009, 10:31||#25|
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I checked the forums for the right pressure to be pumped for my Zen Estilo (not the new one). I am slightly confused by different recommendation.
I am guessing putting 33 psi would be ideal, anybody thinks its not recommended please let me know.
|28th October 2010, 15:59||#26|
I too have a similar experience, where i have run my 2009 mhawk 23000Kms+ at 40PSI(recommended is 32)without any uneven wear&tear.The down side i feel is the ride quality is stiff,Have not been able to notice any significant difference in FE.
I experienced major difference (-4KMPL) in FE of my NHC2004 when I floored the pedal.However, in mhawk there is hardly any!!
Even if I drive the best possible - let it roll in neutral, the maximum visible difference +/- 0.5KMPL!!
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