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Aston Martin GT4 1:33 at Laguna SecaThe GTO.R was built for Rolex Grand Am's GT category, which was slower than the GTS category that was roughly equivalent to today's GT3/LM GTE cars. They ended up dropping the GTS category because they were just as fast as the Daytona Prototypes at the time. The only data point I can find that we can compare to GTSport is a 2007 race at Laguna Seca that put the GT category around 1:29.5 which is nowhere near competitive with Gr3.
https://sportscar365.com/imsa/impc/automatic-aston-quickest-on-friday-at-laguna/
Edit: To add, the Bathurst Monaro is nearly V8 Supercar spec: 600hp/1400kg. Even having 200hp more than the GTO.R and being 300lbs heavier, it still has skinnier tyres and looks more production based than the GTO.R.
Edit2: Only reference I can make are the Monaro 427C lap time versus an M4 fastest lap at Bathurst.
2:13 for the Monaro 427C
2:16 for the M4 GT4
The M4 GT4 did that time after the circuit was resurfaced.
Again, by looks, I'd still suggest the Monaro as the GT4 spec and the GTO.R as the GT3 spec. Even though the power differences say otherwise.
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