I also keep 35 psi tyre pressures in both my vehicles -- Santro and Swift Dzire Vxi. Recommended tyre pressure for Santro is 30 psi and for Dzire is 33 psi.
In rainy weather and/or when tyres get old, it may be prudent to drop the pressure slightly (say 33 psi) for optimal braking and road grip, considering that we will be doing lower speeds anyway. Also on bad roads or for city use, I would recommend sticking to manufacturer's recommendation. But being lazy, and considering the frequent highway drives, I always maintain 35 psi in my Santro under all kinds of conditions.
For Alto, noting that it is a light car with fairly thin tyres, 35 psi could be on the higher side for stock tubetype tyres-- braking and road grip could be affected, especially when tyres get older. But if tyres have been upgraded to tubeless (e.g. Michelin) then 35 psi could be fine. It is up to each driver to experiment and find the optimum according to his/her driving style and the condition of the road/vehicle.
Here is an interesting experience of mine with Swift Dzire Vxi. Got the tyre pressures set to 35 psi at a petrol bunk, and took the car for a Mumbai-Pune drive. Took a sharp right under a flyover to turn towards Pune. To my horror, the car did almost a 45-degree spin, with the rear sliding to the left (this skid is called "oversteer"). Had a tough time controlling the car but managed to straighten it out. Fortunately at 8 AM the traffic was light and there were no vehicles close to my left.
I was puzzled by this skid, for I was doing my normal speed. My instincts told me that this skid was not normal. Later on, found that the rear left tyre had lost pressure due to a puncture. Pressure was about 24 psi. The digital gauge at the petrol bunk had malfunctioned. This drop in pressure had happened in about 2 weeks.
This is an important lesson for those who would keep lower-than-recommended tyre pressures for the highway. I would say: Never, ever do that. You will not have any margins in case of puncture and could suffer a serious accident.
[ http://in.youtube.com/profile_videos?user=sradhakr1&p=r ] & [ http://arxiv.org/abs/quant-ph/0504115 ] & [ http://www.worldscinet.com/ijqi/08/0803/S021974991000640X.html ]
|