Needs to be tested in hills as well... lack of power

 

I have a dzire vxi 2008 model what I feel to my experince after driving it for nearly 2 and half years and 22000 km that it does lack with power and it has manufacturing problem with rear wheels. The alto omni van and other less powerful engine cars are always over taking me easily when they are carring more passanger than me while climbing up hill. Secondly this diwali when I was driving my dzire uphill with 5 with the driver and sum luggage of four people the car could not climb where as one of my cousin with santro zing he could easily climb the same hill and I had to ask my cousin to push my dzire up that same hill which the santro easily made it. I very often go to maruti station for check up and servicing. Thirdly I live in a hillstation when there is a jam in a steep climb and as the traffic is clear when I start to release the clutch and try to move the rear wheel skids really badly the car refuses to move forward. My first doubt was tires but when I went to get it checked in maruti service station the expert told me that my tiers were perfect and I even ask him for a test drive, after the test drive the expert says the car is perfect. I told him that look I dont mind spending money but please tell me that you can fix it but all that he can say is that your car is perfect and nothing is wrong.?

 

Can anyone tell me is there any power difference between dzire 1.2 and 1.3.

 

good rideless ground clearance,lack of power in hills,lack of power in hills