Lotus technical director James Allison says the scale of the change teams face in 2014 amounts to a “tsunami” compared to the “ripple” of 2009.
Mark Webber says it isn’t clear whether the 2013 generation of Pirelli tyres have produced the gains in speed that were expected.
Felipe Massa said he was not disheartened about ending the first test session of the year over a second and a half slower than the fastest car.
Jenson Button played down the significance of his rapid lap on the first day of testing which saw him lead the field by eight tenths of a second.
Christian Horner says Mark Webber will continue to receive equal treatment at Red Bull.
McLaren started 2013 the way they ended 2012, with a mixture of performance and unreliability.
Pictures from the first day of testing of the 2013 season at Jerez.
Toro Rosso team principal Franz Tost said his team is pursuing a deal to use Renault engines from 2014 so they can share technologies with sister team Red Bull.
Williams have revealed their new livery for 2013 on last year’s car. Here are the first pictures.
The first test session of 2013 has begun at Jerez in Spain. Here are pictures from the start of testing,