But Andy... Look at your torque curve between 5000 and 7000 and look at Zsolt's between 5500 and 7500.
Yours is nice and flat, his is dropping steadily.
I'm pretty sure this is where upshifts and corner exits are landing in both cars.

Factor in that the RX7 is transferring all that weight to the drive wheels while the Integra is doing the opposite and any mystery is solved.

And I agree that 40lbs won't make a huge difference, but 90 to 100 will, so I'll say it one more time...
ITS Integra GSR - 2600lbs.

Look guys, the ONLY thing the GSR has on the RS/LS (that is in ITA) is about 20ish peak hp at the top end. Thats it.
Chassis, brakes, aero... everything else is the same.
So riddle me this...
With just a 20 peak hp advantage (and the non VTEC ITA cars actually have a better TQ curve), why is the GSR not only in a higher class but also weighs more?
See... That doesn't make sense. And if it makes sense in the formula then I suggest that the formula is busted.