CarTest software, anyone try it?

[Aurora40]

http://www.cartestsoftware.com/cartest4.5/index.html

Download at the bottom of the page. It's a DOS program, runs fine in windows. You don't have to install it, it's just an executable.

Anyway, I was playing around with it a bit customizing it to my Z's power levels. I noticed that going from stock gears to 4.10's to 4.56's, it made no diff in the 1/4 mile times. I found that surprising. It also seems to underrepresent the grip street tires have. Like it put my optimal 1/4 mile time at 12.8@116. The MPH is on, but a 12.8 from a car capable of 116's seems like about the worst you could do.

Anyway, just curious if anyone else messed around with it.