World champions Renault insist they should not be judged by pre-season testing, warning they have more up their sleeve for the first race of the season in March.
The Anglo-French team ran their 2006 car for the first time on January 10 and have impressed so far in testing.
World champion Fernando Alonso posted the fastest time of the week last Friday at Valencia to send an ominous warning to Renault's title rivals.
But technical director Bob Bell has revealed Renault will be even stronger come the first race in Bahrain next month, thanks to a raft of improvements he has planned.
Bell said: "We will introduce development packages through the season. That will help maximise our production resources, and will allow us to have a firm idea of the step forward we make each time.
"We aim to have new parts on the car at every race. For example, the aero package on the car at the moment, is quite different from what will be used at the first race."
Bell also declared last year's championship-winning car flawless and claimed the main threat to Renault's superiority comes in the shape of new rules.
New smaller engines have been imposed for 2006 but Bells hopes that major change will not derail Renault's chances.
"The 2005 car did not have any real weaknesses, as our championship victory showed," he added.
"For 2006, our challenge was to understand the impact of the engine regulations on the chassis design, to include those new challenges in our projects goals, and to pursue our development path under stable chassis regulations.
"We tried to make parts lighter and stiffer, while improving the car in every area."
