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[Land-speed] The Speedometer Calibraton Question..

To: LSR <land-speed@autox.team.net>
Subject: [Land-speed] The Speedometer Calibraton Question..
From: drmayf <drmayf@mayfco.com>
Date: Fri, 25 Apr 2008 12:02:34 -0700
Ya'll know that sometimes I ask things just to get someting started on 
the list. If you didn't know that, now ya do. But this one was a serious 
question. Ya'll remember when you were kids or when you kids played the 
pass it along game? You know, the one where you tell something to the 
first kid and the reapeat it to the next one and so on? Well, this 
question morphed into that game, lol... But new features were added in. 
Like a new kid arriving late and gettingto the middle of it without 
knowing what the game was or why. 

The manufacturer of the speedo said to install it. Ok, did that. Now 
find a measured mile. Haven't done that part yet because this is for my 
race car and I sure am not gonna drive those big expensive tires on the 
asphalt nor would I get very far anyway with the noise the car makes. 
The mfg then says, at the zero mark press the calibration button. Drive 
a  mile. Press the cal  button again. This automatically loads the 
number of pulses the entire system generates in a mile into the memory 
of the speedo. Then, when I drive the car it can calculate the speed. 
This whole idea was to tow the car down the course at the conclusion of 
the drivers meeting, stopping at the 0 mile mark or any of them actually 
and pressing the cal button. Then after a mile stop and press it again.  
That was and is the entire calibration sequence, lol.

I received responses from namless people who had me doing truly wondeful 
things. Using a GPs unit (hey if I had one of those, I wouldn't need the 
speedo, lol), to doing fast fourier transforms of the signals, to taking 
it to a dealer or speedo shop to so really off the  wall items... Them 
we wont address...

So if I cannot get permisson to tow the car druing the conclusion of the 
course exam after the driver's meeting, then I will hook up the tow 
truck. get lined up on the return road, press the trip meter reset in 
the truck, press the cal button in the car and tow it for one mile. then 
press the cal button again. All at 20 mph or less. Alternately, I can 
use the GPS laptop I have and let it tell me when one mile has been 
reached. All of these should get me clsoe enough for the speedo cool 
factor to cut in, lol...

So, I thank all who answered me on and off list, because some of the 
methods were a hoot! I will patiently await an official response for the 
BNI folk...


mayf
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