The Young Driver Test at Silverstone has given Caterham an opportunity to run some of the parts that they plan to use on their 2014 car.
The Formula One regulations will change quite a bit for the 2014 season with the biggest one being the switch to the 1.6l turbocharged V6 engines.
With only a handful of testing days next year, Caterham are using this week's test at Silverstone to trial a few systems.
Test driver Alexander Rossi, who was behind the wheel of the CT03 on Wednesday, revealed some of the interesting bits that they are running.
"We were running a new mechanical system of balancing understeer and oversteer between high speed and low speed corners," he told Autosport.
"It's something we have never run before, this was the first time. We understand what it does, and tomorrow will offer another chance to tune it.
"The rule changes are so big that any idea you can get before the actual car comes to the track is going to be a benefit, so our focus was on the mechanical side of things, working a lot on trying things out for next year.
"It means going into next year we're not bolting something on that has never had track mileage; we've done that now.
"Every day I get to drive an F1 car is good anyway, but running quite a few new things, and genuinely helping the team, was great."