Going off my current specs the Richmond calcultor is on the money ET wise. It says I should be running 10.0 with 503rwhp. I have run 10.4 with a an average 60ft of 1.7 (radials) so a 1.5 should net me that flat 10. My trap speed was more at 136.52 over the 133 that it said.
However, when I was on a 98RON tune rather than E85 pump fuel making 391hp my car trapped 131mph and 134mph (11.0 and 11.2)
There were other factor such as a 1.87 60ft on both passes, smaller 225 tyres. The Moroso says 10.7 @ 121mph.
Torque is something so often overlooked when it comes to dynos, an example is the above 391hp pump tune compared to 520hp I had with a less active motor with a big turbo and lots of boost.
391hp = 134mph GT3037S, big cams, ported head 19psi BP 98
520hp = 137mph T88, small cams and not much else 29psi Race tune
Same dyno, different engines only different was tyres and of course lots more torque in the engine making less peak hp and way more mid range.