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my friend has this thing called a gtech. you plug it into your lighter and you run a 1/4 mile and it tells you your time and whp. i was wondering how accurate this thing could be. he claims it is almost exactly right.
If you can find a extremely flat strip of road you can usually come within 2-5 tenths of your actual 1/4 mile ET. I wouldn't be afraid to use it for my own personal fun & references..but I certaintly wouldn't brag about a GTech time as it may be way off and setting you up for some embarassment
makes alot of diff. your car goes slower up hill and goes a lil faster down hill so yeah it's gonna make some diff. but hey you can find more into at there website...