It can't be a fixed percentage. It would be a fixed amount of HP loss plus a percentage variable.
For instance, double or triple the RWHP and you didn't double/triple the drivetrain loss.
What trans? Converter locked or unlocked? fluids up to temp? Same exact exhaust and induction system? What type of rearend? Do you have air in the tires? What is the gearing? Same rate of acceleration on both dyno's or is one inertia? Etc/etc...
I've seen some cars go from a manual trans to an auto with a very loose converter and "lose" 80 rwhp.
I'll just leave it as, too many variables. Depending on the car and the sum of it's parts there will be a huge spread in realized loss to the tires.
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69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700. 95 F355. 96 Carrera 4S. 59 Cadillac series 62 convertible.
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