Bill or Scott Finley wrote a book about synthetic surfaces where he concluded that synthetic was more similar to dirt than turf.
I have success treating them equally after track to track par conversion.
From Cynthia par book--
A $10k open claimer at Belmont runs the same final 6 furlong 1:11.0 speed as a $10k claimer at Woodbine. But the Belmont sprinter is 22.3 and 45.4 compared to 23.0 and 46.0 at Woodbine.
I don't use turf lines for dirt races and vice versa.
Belmont 6f turf for $10k claimers is 22.1, 44.1, and 1:08.2. Which is not comparable at all to dirt or synthetic, so I don't.
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