Go to:
http://www.paspeedo.com/
these complete instructions and form are on their website.
To determine the actual ratio of your vehicle, please follow the test
outlined below.
Check if the tire pressure is the same as advised by the factory
specifications.
Measure (by making chalk or tape marks) a distance of 52 feet 9 1/2 inches.
Unscrew the speedometer cable at the speedometer head.
Mark the inner core with a paper flag, paper clip or preferably a hairpin.
Push or drive the vehicle over the entire distance, counting the full and
partial revolutions of the cable.
Always roll the vehicle towards the first (A) marking until you see the
inner core start turning to eliminate the gear clearance. Before you start
counting, mark the part of the vehicle that is exactly over the beginning of
the line. Stop counting when the marked portion of the vehicle is exactly
over the end of the line (B).
It is important to verify you have no gear slippage, therefore do the test
three times.
Send the "Test Form" along with your gauge for proper calibration.
Test 1 = ________________ Full ________________ Partial
Test 2 = ________________ Full ________________ Partial
Test 3 = ________________ Full ________________ Partial
David Riker
74 Midget
78 Midget
63 Falcon
http://personalweb.sunset.net/~davidr
----- Original Message -----
From: Frank Clarici <spritenut@Exit109.com>
To: Spridget List <spridgets@autox.team.net>
Sent: Thursday, November 11, 1999 5:25 PM
Subject: Speedo calibration question
> Do any of you listers know the correct number of feet to roll a car for
> the speedo calibration results to send Nisonger?
> This past summer while attending a wedding for a friends daughter, I was
> seated next to the Nisonger rep (small world) He did explain how to roll
> the car 54 feet, ???inches and count the tire revolutions. This I can do
> but I forgot the numer of inches.
> I have to send out the speedo on the A40 since it reads 70+ mph when
> it's only going about 30. The speedo has been "funky" the last few
> months according to my daughter but I recently replaced the speedo cable
> (thanks Peter) and tested it only to see it is stuck at 35 MPH when
> stopped and goes up from ther as soon as you start rolling. But it pins
> out at 80 on the hiway ;)
> With Toyota 5 speed, a Sprite 3.9 rear and bigger tires, I just want to
> have a speedo rebuilt to what I have.
>
> TIA
> --
> Frank
> Drive it or give it to somebody that will
> http://www.exit109.com/~spritenut/
>
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