Blitz Powermeter is more accurate than the G-tech since it uses your vehicles speedometer signal rather than an accelerometer to determine speed.before I sold my Blitz stuff I did quite a few 0-100km/h  runs and the times seemed reasonable.  Time to speed works better on them than time to distance since time to speed doesn't matter if you smoke the tires (unless you smoke  them to the point that your dash reads 60) I sorta wish i still had the powermeter but I always spent my evenings doing dyno runs on the highway which almost got me in trouble with the law enforcement types once. : ) anyway....the Blitz powermeter is in a totally different league from the G-tech. 
 
rich  '91 300ZXTT "Stage 2.5 10psi" 298.5RWHP / 302.5FT-LBS 13.4 @ 106 
 
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