G-Tech meter

[David Doddek]

>Has anyone heard of an aftermarket measurement device called a G-tech meter
>(at least that's what I think its called).  It's a small unit that sticks to
>your windscreen with a suction cup and plugs into the cigarette lighter
>socket for power.  It will give you g-forces, 1/4 mile time, HP rating and a
>few other things I think.  Someone in our car club bought one to try out and
>he said it was quite accurate, the HP reading was 2HP less than actual
>measurements from dyno testing.  His 1/4 mile times were also close to
>actual times.
>
>Has anyone used this device ?  I would like the feedback from a few more
>people before I'd consider buying one, although its reasonably cheap at
>AU$250 after freight and taxes.  I need something to help with setting up
>the suspension in the race car, and this device may just be it.
>
>How does it measure the distance (doppler effect ?), or does it calculate
>distance from your acceleration ?  If this is the case how does it go in
>hilly areas, bumpy roads, etc ?
>
>Thanks in advance
>
>Dan     dzorde at geocities.com
>
>
>
I bought one and I find that it is quite repeatable anthough I do not have
track times to confirm the time and speeds, the numbers seem quite
reasonable.  All calculations results are based on acceleration and
integration resulting in the law of motion.  It works ok on bumpy roads, but
will not be as accurate on hills.  I use it on quite level surfaces.

David Doddek     pantera at pobox.com    www.pobox.com/~pantera    217-422-3722
69 EFI Fairlane, 89 T-bird SC, 74 Twin turbo NOS EFI Pantera (I like to go fast)