The majority of teams oppose the new technical regulations for 2021 being proposed by Formula 1, BBC Sport can reveal.
Six of the 10 teams indicated in a questionnaire organized by Ferrari, Mercedes and Red Bull that they do not agree with.
Only Alfa Romeo, McLaren, Renault and Williams preferred the proposed new rules to the existing ones.
And two of those have made changes to the 2021 rules.
The parties will meet on 16 October to discuss the issue further.
There is a deadline of 31 October for the FIA, motorsport's world governing body, or F1 that they will back down.
If a compromise can not be reached, Ferrari has the right to veto the 2021 rules package.
What prompted the questionnaire?
Ferrari, Mercedes, and Red Bull are the latest members of the 2021 rules.
According to senior figures, these are more and more restrictions on design freedom and led to a number of teams expressing concerns.
At the meeting, FIA president Jean Todt said he did not want to impose a set of rules without agreement. The Frenchman asked for their opinions on the various issues and suggestions for alternatives.
2021 rules or stick with the existing regulations. In the case of the new rules, it has been called "design freedom", and "what teams felt about standardization of parts".
Only Alfa Romeo, McLaren and Renault were found to be on the list.
The teams' responses were communicated to the FIA World Council, by Ferrari team principal Mattia Binotto on 4 October.
Alfa Romeo and McLaren were among those to propose changes to the FIA and teams' leading engineers at which they stand.
What are the proposed 2021 rules?
F1, under the leadership of former Mercedes boss Ross Brawn, has been working for more than two years on a new set of technical regulations, with the aim of closing it up and making it easier to overtake.
A budget cap has already been agreed, and has continued to support the top teams;
F1 wants to change the way cars produce aerodynamic downforce instead of the front wing and the various shapers around the upper bodywork.
Turbulent air from a car in front of a large scale.
F1 so wants to limit it to harder for those with more resources to do the same.
F1, which has a close packed midfield over a second and a lap slower than the top three teams – Mercedes, Ferrari and Red Bull.
What are the objections to the new rules?
The top teams have concerns about the existing rules for a number of reasons:
- The possibility of unintended consequences, as well as the risk of introducing so many significant changes in one go while moving away from regulations. This article is about the size of a 13-inch wheels to 18-inch wheels and much lower-profile tires, which has a significant effect on the design of suspension and aerodynamics.
- Changing the rules could not be better than the top teams would expect.
- They argue that the technical rules are not the true cause of problems when cars race together, and claim the fragile nature of Pirelli's tires – which is overheat easily when drivers push hard or follow another car – is a far bigger issue.
- They believe the proposed 2021 rules are too restrictive and will lead to the same.
- They are opposed to the philosophy of F1 but also want to reduce costs and lead to heavier and lower-quality cars.
Some of the smaller teams – as well as some within F1 – believe Ferrari, Mercedes and Red Bull are trying to protect their competitive advantage. The top teams deny this is their motivation.
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What happens next?
Ferrari, Mercedes and Red Bull presented their own proposal for 2021 to the FIA and F1 on Thursday. The cars would not all look the same.
Under the existing governance structure, the FIA and F1 can simply impose the rules on the teams.
Todt has always preferred to run the sport with a conciliatory and collegiate approach, in contrast to the one often espoused by his predecessor, Max Mosley.
Ferrari using their veto – which would effectively force the FIA to stick with the existing regulations.
But the risk for Ferrari is the veto, they want it to be 2021.