The boss of V8 Supercars Australia says Pukekohe Park is the only viable option to keep the motoring event in New Zealand.
"It's black and white. If we couldn't have made Pukekohe work that would have been game over and we would shut the gate in New Zealand," Tony Cochrane said.
Strong lobbying to move the event to Hampton Downs in Waikato has been taking place since Auckland councillors voted 10 days ago to spend $10.6 million to ensure the return of the annual event to Pukekohe.
Three councillors opposed to the expenditure have visited the two race tracks and declared Hampton Downs to be a better site and Waikato leaders have asked Auckland Mayor Len Brown why $6.6 million is being spent upgrading Pukekohe Park.
Mr Brown said the decision to go with Pukekohe Park was made by V8 Supercars Australia, which will own and underwrite the event from April next year for five years.