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That little device gets brought up a lot. I guess they are fairly accurate. I've never heard of anyone that brought one to the drag strip to compare times though. Most people use them to estimate 1/4 mile times. It does have a function that will calculate HP, but it has to be taken with a grain of salt. The only info. the G-tech has is the weight of your car (that you enter) and the time it took you to cover a given distance. That isn't a real reliable way to calculate HP if you ask me. hehe.
 

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the g-tech is pretty accurate, used it a couple of times for 1/4 but not for hp. the max offset for the time i got was around .3 sec compared to the track times.
 
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