[6pack] Q on the Speedo

[Navarrette, Vance]

	The turns per mile are printed on the face of the speedo in teensy weensy
numbers at the bottom of the speedo. It is possible that you have the wrong
speedo in your car, as there were at least two different speedos on the later
(chrome rimmed) speedos as I recall.
	I do not know about the earlier black rimmed speedos, if there was only one
calibration or if there were more.

	Possible sources of error: Wrong speedo as mentioned above. Wrong speedo
pinion gear (in tranny at the end of the cable). Wrong size tires (205-70
should be ok). Wrong final drive ratio (unlikely), speedo miscalibrated.

	Vance

      Vance Navarrette
    Cogito Ergo Zoom
    I think, therefore I go fast

-----Original Message-----
From: 6pack-bounces at autox.team.net [mailto:6pack-bounces at autox.team.net] On
Behalf Of Ken Davis
Sent: Saturday, January 09, 2010 10:38 AM
To: 6pack
Subject: Re: [6pack] Q on the Speedo

Well.....
Using a GPS unit, I find I'm reading around 8mph faster than I'm actually
going, and using Dan Master's spread sheet (205-70x15, 3.70 final drive) I
come in about 7 mph  in error.   This explains why when I think I'm doing
65, everyone is 'roaring' past me.  R&R time I think.

Ken


>
> Have a specification question on the TR6's Speedo.  Specifically, does any
> one have info on the number of turns per mile?    I'm guessing it'll be
> 'British Standard'  1000 rpm (turns) to a mile, but need to know so I can
> get mine R&R and recalibrated.
>
>
> Thanks
>
>
> Ken
> 73 TR6 (top down)
> Maricopa, Sonoran Desert, AZ