Computing MPH

[steve ravet]

You can read about it in the Sept issue of C&D.  They used it to collect
0-30,60,100 times, 1/4 mile ET/speed, braking time, and track lap time
all in a single outing.

It's a tuner shootout article, 600+hp $100K+ corvettes, MBs, mazdas, and
porsches.

The thing I like is that the Vbox shows the stock Z06 vette CLEARLY
BEATING the stock 911 turbo in all categories except 0-30.  It's FASTER
0-everything else, faster 1/4 mile, better lap time, better braking,
etc.  Plus the Lingenfelter Z06 took home top honors in the tuner
shootout.  A good day for vette fans.

Price on the Vbox was about $3K I think.  You're correct, it measures
the doppler shift of the GPS satellite signals to measure velocity.  The
GPS info itself isn't nearly accurate enough.

--steve

Adam Chant wrote:
> 
> I saw this unit (Vbox) by Racelogic that got speed from GPS signals using doppler
> shift on Car and Driver TV. I'd like to find one of these units and try it out,
> it's an impressive non contact speed measuring device.
> -Adam

-- 
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com
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