Red Bull back rivals' calls to open up F1 engine development

Red Bull F1 boss Christian Horner has threatened to join with rival teams to tear up restrictions on engine development from 2016.

Renault, Ferrari and Honda want an extra step of development during the season to try to catch Mercedes.
Talks over the issue broke down at the Brazilian Grand Prix.
"There are no guarantees we can close that gap significantly to Mercedes but not having the opportunity to do so seems pretty unpalatable," Horner said.
Teams are currently only allowed to develop their engines during the winter.
Change in 2016 would require only majority agreement, whereas unanimous agreement is needed for a relaxation of the rules for 2015.
Horner said: "I think that's the only option because with a majority vote '16, '17, '18 can be open, which is ridiculous because it just means we're all going to end up spending a lot more money over a longer period of time, whereas it should be opened to allow Renault, Ferrari, Honda to close the gap."
World champions Mercedes argue the current rules allow plenty of scope for development, saying 92% of the engine design can be changed for next season.
They have, though, offered a limited relaxation of the in-season restrictions for next year, with a proposal for a small number of extra changes to be allowed mid-season. But rivals Renault, Ferrari and, from next year, Honda, want more.
Mercedes F1 boss Toto Wolff said: "I don't think it's the way forward trying to unsettle the system and saying if you don't agree for '15 , we are going to turn the whole thing upside down, [and have an] engine war.
"You're looking a bit too narrow on your own team's performance and not considering what is going on around you in F1."