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914World.com _ 914World Garage _ G Tech Pro Performance Meter
Posted by: pjhaun Oct 7 2003, 06:53 PM
If anbody in the group is interested: Ebay has the G-Tech up for bid for $48.00. It Retails for $139.95. See it below.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&category=46100&item=2435959282
Posted by: Charles Deutsch Oct 7 2003, 07:59 PM
Thanks for pointing this out! It was too good of a deal to pass up so I bought one. A few years ago, I wrote a software program, using Simpson's rule of numerical integration, that performs the same calculations as this unit. 
Posted by: drew365 Oct 7 2003, 08:20 PM
I bought one about a year ago and have only played with it a few times. It has limited usefulness for a road racer. They need to increase the record time to be able to record more than a 1/4 mile.
Posted by: Charles Deutsch Oct 7 2003, 08:25 PM
I only really want it to test rear wheel hp and acceleration times. I'm willing to spend $48 for that alone.
Posted by: seanery Oct 7 2003, 08:34 PM
I'm scared, I've agreed with quite a few things Alfred/Jeff/Charles has said lately.
I bought one, too!
Posted by: redshift Oct 7 2003, 08:40 PM
I missed the hail of hell, but it seems to me he's not trying to be an ass.
M
Posted by: Aaron Cox Oct 7 2003, 08:42 PM
so your a racist now? you stay awake thinking about math problems?
Posted by: seanery Oct 7 2003, 08:44 PM
i hate whitie!
Posted by: Aaron Cox Oct 7 2003, 08:44 PM
Kill Whitie!!!!!
ROFL
Posted by: Charles Deutsch Oct 7 2003, 08:52 PM
I once watched some news footage where some white, broad-minded, liberal, do-gooders were marching with a group of blacks to confront some racists and when the racists didn't show the blacks started beating on the whites that were marching with them! OMG, I laughed 'til I cried!
Posted by: sj914 Oct 8 2003, 03:30 AM
Isn't that the old design. The new ones look much different.
Posted by: Curvie Roadlover Oct 8 2003, 04:27 AM
Posted by: Jeff Bonanno Oct 8 2003, 02:07 PM
quote:
"To find values for difficult integrals, either the Trapezoid rule and Simpson's rule can be used. The trapezoid rule approximates area under curves using (logically enough) trapezoids, and Simpson's rule approximates using parabolas. Simpson's rule is generally more accurate and is exact if the polynomial being integrated is of degree three or less."
Alfred, how many times have you thought "wouldn't it be nice if we just knew the form of the function?"
Posted by: daktaklakpak Oct 8 2003, 02:12 PM
That's what the gtech pro looks like the gtech competition version has the more high tech look to it.
Posted by: Charles Deutsch Oct 8 2003, 02:23 PM
"To find values for difficult integrals, either the Trapezoid rule and Simpson's rule can be used. The trapezoid rule approximates area under curves using (logically enough) trapezoids, and Simpson's rule approximates using parabolas. Simpson's rule is generally more accurate and is exact if the polynomial being integrated is of degree three or less."
Alfred, how many times have you thought "wouldn't it be nice if we just knew the form of the function?"
Jeff,
The G-TECHPro's accelerometer provides an acceleration value every 2.5 milliseconds so that's the interval I used for the acceleration values in my program. The program's output (acceleration times, hp, etc.) agreed with the true values up to three decimal places.
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