Force India Deputy team Principal Bob Fernley is unconfident yet just when the new parts will be ready to run.
"The developments are quite important, but the main thing is to run them in Spain," Fernley told Autosport. "Hopefully we can get some running of them in Mugello, but it depends on how everything flows through.
"Mostly the parts are there: we have cleared about 85% but we need it at 100% - so we are close. Hopefully we can run it for one day, or one-and-a-half days at Mugello, and if it correlates on track to what we have in the wind tunnel then it will be a good car."
In 2012 Formula 1 season being more competitive, any grow made over the opposition could be important in terms of helping drivers Paul di Resta and Nico Hulkenberg bring more points-scoring finishes.
"We have some wonderful people around us who are trying to do the same thing and improve their cars," said Fernley. "If we stay where we are, or they get a little upgrade and we get a big one, I'm not so sure yet. But even two tenths relative to the opposition nowadays is going to be massive."
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