"I think what we've found with the Honda engine installation is that it's fundamentally different to Renault's -- there's no commonality possibilities there really," Key said. "The chassis design is obviously different, the gearbox is different as well. It's all been done by us in that respect.
"The other thing is that it's a works deal, it's a proper combined effort. There's all the dyno testing, R&D rig testing, joint-development and design work, design work for next year is already underway so all of that is very unique to our relationship to.
"It's a heavy responsibility all that actually, we're looking forward to it, it's a very positive pressure but it's a big responsibility to provide the level that Honda need to progress as well with the team they're working with. It's less opportunity for commonality definitely."
The Honda works deal has offered Toro Rosso extra resources, but Key said it has also come with extra workload that his team had never previously experienced as an engine customer.
"You kind of dream of all of this stuff and then when it all arrives on your doorstep you're like, 'Jesus there's an awful lot to do here!' We began rig testing of certain engine relating systems on the chassis side back in November. We were dyno testing the gearbox in December and have been ever since, both in Milton Keynes initially and Japan as well, so we've got gearboxes in Japan and Milton Keynes too.
"We've been able to do some cooling system tests and so on. That's where that pressure comes. It's when you've not done that in the past, while it's a great opportunity to do it it also puts the team under that added pressure of substantially more parts to manufacture, engineering support, not in Italy but around Europe or in Japan.
"There's quite a bit of added workload for that but it's all for good reasons and certainly Honda needs to have that close relationship with the team to see through those aspects. Gearbox is fundamental for the engine supplier, for example."
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