Although the Frenchman could only qualify 11th at Sepang having mistimed his Q2 run in changing weather, he is now much happier with his Lotus.
"We're keeping our fingers crossed but finally we've come back to where we like," said Grosjean.
"We went through the data and changed it a lot from yesterday, and finally the car stayed as we thought it would on the set-up and we could work from there.
"We made some decent changes overnight and through P3, and it's made it better."
Grosjean thinks a dry race would be best for his efforts to progress from row six.
"The car is already good on long runs. The weather is a question mark," he said.
"I think we missed a bit of downforce with the rain [set-up]. A dry race would be good for us because we have a lot of tyres in our pocket."
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