well in my experience fatter tyres inflated to the normal pressure definitely enhance the stability of the SUV around corners because of the inherently wider stance. I never over-inflate or under inflate. The footprint/ contact patch should always be kept at the optimum level.
I ve found this to be true in the Bolero and in the Scorpio AND in my old Gypsy which had fat 215/75/15 radials. The old MM540 with standard Jeep HT 75 tyres used to squeal around bends in the Nilgiris even at speeds like 50KMPH.
With the advent of the radial tyres this changed a bit, but still that vehicle should NOT be driven at rally type speeds around bends in the hills unless of course the driver harbours a secret wish to join his forefathers!
however, to reiterate once again as I have mentioned in many posts before this one - one simply cannot and should not drive an SUV the way one drives a sports sedan. its innately high stance, high ground clearance and otherwise ponderous proportions cause a much higher centre of gravity and hence a higher likelihood of turning turtle or toppling and this fact MUST be respected.
For example in my opinion, taking an SUV like a Scorpio around the bends in the hill roads like say Ooty or Coorg or somewhere, one should keep to lower speeds in lower gears most of the time, atleast this ensures you have enough torque kicking in to take you out of trouble should you encounter some.
the ideal drive gear would be 3rd and 2nd ,sometimes 1st around bends as per the specific characteristics of the bend. Optimum speed for taking bends in 3rd would be around 50-60 MAX, 2nd would be 40 Max and 1st would obviously be 20 Max. In any case at higher speeds than this, one's engine will strain and let you know its displeasure in no uncertain terms. The optimum speeds can be of about 70-80 Max on the straight bits.
Driving in the correct gear reduces un-necessary strain on the engine and avoids over usage of brakes - as described in my post about taking bends on the Sigur Ghats on the Linea trip to Ooty thread. Also while we may like to believe otherwise, not all of us are as blessed with the driving control skills that a Sebastian Loeb has!
Ive driven for years in the hills in a selection of different cars and jeeps and thus believe I know what can and cannot be done in different types of vehicles.
there is a trick to taking bends - the shortest LINE through the curve is the most enjoyable way to take a curve- it can be done at night when there is no one on the road and one can see miles ahead with the headlights. Not recommended around Blind Curves though since you never know, there may be some poor chap whose vehicle has broken down sitting there with no lights! On our roads in the current dispensation, it is far better to adopt slightly defensive and more responsible driving techniques than otherwise. One more pointer - when driving SUV's or any other vehicle in the hills especially, the typical observation I have made, is that most of the plains drivers tend to stick to the right side lane -this is an absolute NO NO - simply because around the next curve the driver may have a date with destiny in the form of a large bus or truck, who is quietly buzzing along on the correct (left) side of the road, and who cannot stop in time to avoid the idiot who is in the wrong side. Remember also that our hill roads are rather narrow.
another thing -
again - I would suggest that we always remember the responsibility we drivers owe to ourselves, our passengers and of course our fellow road users.
Quote:
Originally Posted by freewheelburnin I found this line in the article
"But tires which are operated at the maximum pressure tend to have reduced contact area and thus produce less cornering force which is good for SUV's and 4 x 4s"
Is it true that wider tires will produce more cornering force and hence cause the vehicle to topple, but lesser contact area and harder tires with more air filled will oversteer and prevent toppling?If this is true what would be the advantage of wider tyres? |