Renault are the latest high-profile team threatening to quit Formula 1 unless proposals to adopt a £40m budget cap in 2010 are shelved.
On Tuesday, Ferrari joined Toyota and Red Bull in declaring their intention to pull out of F1 because of the plans.
The plan would allow capped teams to operate with far greater technical freedom than those continuing with unlimited budgets.
However, big teams fear the rules will effectively split F1 into two tiers, those that can live with the cap and enjoy the technical advantages and those that cannot.
It is understood a flexible rear wing alone, currently outlawed but available to a team next season working within the cap, could lead to a car being two seconds per lap quicker than those without.
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