Is somebody compare this thing with dyno , track time, rev meter or similarly and it is accurate ?

 

It's a prediction based on forces like acceleration... this can be altered by angle, vibration , launch, wheel hop, wheel spin, and other factors. It's a guestimate, and while it can come close sometimes, it's not going to be anywhere near as reliable, repeatable, and accurate as a dyno.

 

Don't know man, I'm in doubt, just googling and found this http://www.sub5zero.com/mobile-tech/...ultimate-gauge and this guy http://www.youtube.com/watch?v=2Tyozgkc7dE, don't wanna talk about garage 419 video.
Is someone from this forum compare this thing?

 

I thougth they stop making those sh*t.

 

people who i know have run these on the track and they are within' 0.3 seconds on the E/T or better and within' 2 or 3 mph. i've gotten these numbers from multiple sources and we all think that they're close enough for argument sake. I think they are very useful for practicing getting the 60' times down. The dyno function, even when making multiple runs and taking averages can still be around 10% off so not that useful. The G-meter built in is incredibly accurate so it all depends what you want it for.

I found it very useful for tuning. I could make a couple pulls through 3rd gear, adjust timing by a degree and then make another couple runs and see if the G's pulled went up or down.