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Somebody informed me that the pictures of the datalogging FAQ were not working, so I reuploaded them and reposted below... So, here's a screen shot of a datalog. I've divided it into 3 parts... the launch (where the launch control rev limiter is active... more about the launch control in a later part), first gear, and second gear. 
Q: Which units come with the datalogging feature? All units come with datalogging capabilities... even the basic unit.
Q: What kind of software/cables are required?
Software is included with the traction control system. There is a serial cable which is also included with the unit.
Q: What kind of computer will I need to use the datalogging?
Almost any old PC laptop will work. Even a 486 laptop will work (you can get one for $50 from E-Bay!).
Q: What kinds of things can you record and examine with datalogging?
Check out the picture below... there are values for the wheelspeed for each individual wheel, rpm, and the amount of power reduction that the traction control unit is kicking in to control wheelspin. The values that are being displayed are those at the exact thousandth of a second where the red cursor is at (you can move the cursor back and forth to observe what the numbers are at each time point). Notice how the wheelspeeds diverge and come back together again. When the wheelspeeds are different (like where the cursor is located), then that's where the rear wheels are spinning, and when the wheelspeeds are all the same, then there is no wheelspin occuring. Also, notice how around the cursor, the rear wheels are starting to slip a little bit... at that same time on the bottom, the traction control is kicking on and off to bring the wheelspin under control! (The blip in wheelspin afterwards is due to the "chirp" from shifting gears). 
Q: Can you compare different logs with each other?
Yes! Very easily... check out the picture below which commpares 2 different runs... one with the launch control set at 3500rpm and the second with it set at 4000rpm. You'll see that the 3500rpm run is the better one as the traction control doesn't have to work as hard as in the 4000rpm run... this is due to starting with slightly less boost in the 3500rpm run. (Notice how this gives a significant advantage for acceleration as the run in panel A peaks in 1st gear much quicker than panel B). 
Q. How do you do the datalogging? Simply leave your laptop hooked up to the unit, hit the start button, and start driving!
Q. What other things can you tell from the datalogging?
You can determine your 0-60mph time easily, by simply observing the time when your wheels hit 60mph. Another thing is you can see at exactly which rpm you shifted at. Yet another is how smoothly your launch went. The number of things you can examine is almost endless with the datalog. You can record an entire autocross event and go back to examine how you and your car were performing at ANY time point!
So, as you can see, the datalogging is an amazing tool that you can use to tune your Z and driving skills.
RACELOGIC GROUP BUY GOING ON NOW! Click for details Bernie Authorized sales rep for...
Datalogs every run... launches with boost in your 5-speed...
keeps turbos spooled between shifts... enables controlled power slides...
valet mode prevents abuse of your Z... unlike most factory systems, maximizes acceleration! For more information, pricing, or to purchase a system,
feel free to e-mail me: bhsiao@newssun.med.miami.edu
or visit the website
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RACELOGIC DATALOGGING pics... 1 week left on GROUP BUY! - 
