G-Tech meter

[Geoff Watts]

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Environment = hills

if you're on an incline, the accelerometer's output will be offset, because the earth has gravity (1g of acceleration).

If you were driving on a different planet that revolves around it's sun slower or faster (time) it would also be wrong :)

geoff

-----Original Message-----
From:	DARROW COLE [SMTP:darrowco at library.ucla.edu]
Sent:	Wednesday, April 30, 1997 11:54 PM
To:	diy_efi at coulomb.eng.ohio-state.edu
Subject:	Re: G-Tech meter

Hi All,

Am I correct in thinking that the G-Tech calculates rear wheel hp, etc based on measured accel, time  and known mass 
of the vehicle?  I can't figure out how environmental factors would affect 1/4 mile et and mph readings. Help 
please!

Darrow



On Wed, 30 Apr 1997 18:01:27 EDT Bruce Bowling <bowling at cebaf.gov> 
wrote:
> > 
> > Drag-strip testing with the G-Tech Pro's have shown that they're
> > consistently off.  Each unit's variance differs, but it's consistently off
> > in the 1/4 ET and MPH (it's usually a little low on the ET and ~2 MPH high
> > in the MPH).
> > 
> > 
> There are going to be off for many reasons. One big reason is that
> none of these systems perform any type of environmental correction,
> so trying to get any absolute numbers out will not work. For relative
> comparisons, they are O.K., as long as the test environments stay
> the same.
> 
> - Bruce
> 
> --
> -----------------------------------------------------
> <<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> -----------------------------------------------------
>                  Bruce A. Bowling
>                  Staff Scientist
>    Thomas Jefferson National Accelerator Facility
>     12000 Jefferson Ave - Newport News, VA 23602
>                  (804) 249-7240
> bowling at cebaf.gov  http://devserve.cebaf.gov/~bowling
> -----------------------------------------------------
> <<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> -----------------------------------------------------



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