The championship returned to a formal parity review structure this season, featuring lap time based triggers.
Supercars’ system crunches in-race lap time data from cars of each manufacturer on a rolling six-race average.
The category is required to launch a review if the calculated disparity is outside the stated 0.1s threshold once equated to a 60-second lap.
Reviews were launched for both the Chevrolet and the Toyota after Taupo, which resulted in changes to the Camaro over the next two rounds.
Speedcafe understands it also triggered reviews for both cars following Darwin, again requiring Supercars to dig for any technical discrepancies.
On this occasion the review did not result in any changes.
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Chevrolet was happy with its earlier tweaks while Supercars is not willing to budge on the Toyota while its known engine weakness remains unresolved.
The parity threshold number is believed to have been reached in the bulk of individual races so far this season.
Supercars is understood to have already begun sharing ideas for altering the formula with the three homologation teams.
The earlier changes to the Camaro were controversial as they came just three rounds after off-season wind tunnel testing set the aerodynamic specifications.
Supercars insists it remains a technical parity formula and is not attempting to apply sporting parity in the style of Balance of Performance.
Any tweaks to the parity review system would only be implemented for 2027.
Notably, the current system does not allow parity changes once the Enduro Cup has commenced.
The Supercars Championship continues this weekend with the NTI Townsville 500, before Perth and Ipswich close out the Sprint Cup.
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