Re: Tach vs. Speedo


"Lanny Chambers" <lanny@xxxxxxxxxxxxxxxx> wrote in message
news:lanny-8C8A21.09353029112005@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> In article <SDXif.18871$ek6.16742@xxxxxxxxxxxxxxxxxxxxxxxxxx>,
> "Squat" <Squat@xxxxxxxxxxxxx> wrote:
>
>> Sometime ago I owned a 99 Miata with a 5-speed manual. One funny thing
>> about this car was that when you were in 5th gear, the tach and the
>> speedo
>> were almost perfectly parallel. I thought this was strange when I owned
>> the
>> car. Now, this car had aftermarket wheels so I am not sure if the tires
>> were
>> the same size as the factory original. (I bought the car used.)
>> Has anybody else noticed this on their Miata?
>
> Sure, but it's just a coincidence that depends on gear ratios and gauge
> calibration. 1994-97 Miatas have a slightly-taller final drive ratio,
> and the speedometer reads a bit more clockwise than the tach.
>
> The tire size has nothing to do with it, since the speedometer is driven
> by the transmission and reflects how fast the driveshaft is turning, not
> the actual road speed.

I hadn't thought about that. Guess the tire size is irrelevant.
Has anyone seen this on the new 2006 model? I like the new model although I
would prefer to have a Mazda Speed edition of the 2005. I always felt that
my 99 needed a little bit more power.
Thanks,
Squat

> --
> Lanny Chambers
> '94C, St. Louis
> http://www.hummingbirds.net/alignment.html


.

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