The Polish F1 star believes that the car he drives is different than the one that his teammate, George Russell is driving.
Both Kubica and Russell finished at the bottom of the timesheets during the 2 Free Practice sessions on Friday. The Williams FW42 proved to be highly slow, as George Russell finished the 2nd session 3 seconds slower than Vettel, who happened to be the fastest of the day.
Kubica was however, was a complete 1 second down on his teammate's FP2 time. Keeping the significant gap in view, the Pole commented: "At least we understood that in Australia I ran a different set-up than George and we could clearly see the different characteristics in the cars,"
"Here we started with the same set-up and the characteristic is still different"
"I thought in Australia that it was maybe caused by some damages to the floor, and maybe a different set-up, but at least after the first session here we got an answer.
"It's clear that we are driving two different cars with the same set-up, so that is something we need to understand.
"It's quite obvious on the data"
"So now we need to try and find the reason." said Kubica.
The 2008 Canadian GP winner had his damaged car floor to blame for a deficit to Russell in Melbourne, but Kubica rejected any such theories this time around, confirming that the car floor of his FW42 was not damaged at all.
Kubica added: "The car characteristics with the same set-up are completely different. I had some doubt after Australia, honestly I thought it was caused by floor damage.
"The floor is in a good state here, and we are still through we are using the same baseline set-up as the other car we have different characteristics, it is quite significant.
"Maybe it is something within the aero which is upsetting a lot the handling of the car and the general grip of the car.
"So we have to wait and see and try to find the answers"
While speaking to Motorsport's Adam Cooper, Kubica made it clear that he found his car hard to drive due to these persisting issues. He continued saying: "It's looking strange, to be honest, and it's putting me in a very difficult position to drive the car.
"Additionally, if I try to follow it up with some balance shift I have to reduce a lot the grip, and the potential of the car.
"Neither way is good. I make it more drivable, I am slow"
"I make it let's say as it should be and it's undriveable.
"It's a very, very difficult situation"
"I just hope that we will be able to solve it and if we are able to solve it will probably be the first time I am driving the car with better potential.
"It's matching my feelings, and it's clearly visible on the data. There has to be a reason, nothing happens without a reason, so we just have to have a deep think.
With the departure of Paddy Lowe last month, Williams was left without a chief Engineer to lead the development of the car or the rest of the season.
Surprisingly, the team confirmed yesterday that the cofounder and former Engineering Director of Williams, Sir Patrick Head is now returning as a Consultant. That certainly could light up a torch of hope for Kubica, who foresees potential improvement to FW42 in future.
"If we are able to fix it and find those normal characteristics then the feeling will improve and the operating window will get bigger." said Robert Kubica.
"Now it is really difficult to drive and I have to take actions on the setup to improve driveability and it's reducing a lot of the grip so it's really difficult."
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