Ferrari plans to bring the main upgrades to its 2014 Formula 1 car during the final pre-season test in Bahrain.
The Italian team has run its F14 T in relatively conservative specification so far during testing, as its focus has been on achieving enough reliability to carry out long runs.
However, pre-Australian Grand Prix developments are planned to be introduced throughout the final test, which starts at the Sakhir circuit on Thursday.
Speaking about the new parts Ferrari ran in last week's Bahrain test, engineering director Pat Fry said: "We've got a few bits that we're testing to check correlation, but I wouldn't really call them upgrades.
"The main upgrades we will be bringing through at various stages of next week."
Fry admitted that the telemetry issues that cost Kimi Raikkonen some running last Friday were a setback, but he added that the team will simply try to ramp up its mileage in the remaining days to make up for it.
"We've got a bit of catching up to do, yes," he said when asked by AUTOSPORT if the delays had affected Ferrari's plans.
"We're always trying to do as much mileage as we can and we obviously got set back.
"It would have been nice to have a 100 lap day but we're a little bit short."
Ferrari completed 287 laps across the four days in Bahrain last week, with Mercedes, McLaren and Williams all marginally ahead of it on the lap chart.
Follow the final pre-season F1 test on AUTOSPORT Live from 6am UK time on Thursday February 27
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