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The G Tech is pretty accurate. There are some things that throw it off. If you are checking acceleration or 1/4 mile times, wheel spin will throw it off. It seems to happen only when there is enough wheel spin to kick to tail end out or get you slipping from side to side. A small amount of spin doesn't seem to affect it.
 

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Horsepower is a different matter-
You'll have to input the weight of the car and even then, a soft suspension will flake it out.

My 180hp Audi made the thing think I had 225hp.

In this case, using it to compare mods on the same car, its useful.
 
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