Just to cure my curiosity, Mike K and I timed some of my recent RFR laps via DVD and I clicked a 92.1 second lap.
To put that into comparison with where the time trial cars were running,
Bensons- 85.x range
Mike C Cobra- 100 Seconds
Art M Corvette- 91.16
Matt's Sti- 92.1
So, K and I decided that a 1:30 is a target lap for the sti's in current rtrack config.. However, I doubt we'll ever run that config again