Technically, TDI means turbocharged direct injection. However, VW uses it for the common rail direct injection diesel engines. Refer the following links for details. http://en.wikipedia.org/wiki/Turbocharged_Direct_Injection http://www.carblogindia.com/crdi-technology-in-plain-english/
Different cars have different BHP and weight figures. So power to weight ratio is a way to compare them. Look at the car’s power output (bhp figure). Look at the cars’s kerb weight (unladen weight).
Divide the power output by the kerb weight. Multiply the figure by 1000 to get the bhp-per-ton figure. Now you get the power to weight ratio, as BHP…[Read more]
There is no definite answer to this question as you may have to change the suspensions even after a few thousand kilometers if the car has gone over a couple of nasty potholes etc but generally, they should last more than 50,000Kms in regular use on Delhi roads.