It’s better to launch 800cc and 1000cc together, so buyers have option . if some one wants to purchase 1000cc so they don’t have to wait for long .
The basic reason behind the 800 cc launch of KWID was the domination on the market by Renault. They wished to price the car very competitively and launching the 800 cc first was the part of this strategy. Once the car becomes famous, the rising prices would not matter too much to the people. Also, the car with 1000 cc engine would have easily crossed the pricing of the current 1000 cc rival cars, making it a negative point for Renault at the launch time of their fortune maker.