Ferrari Mailing List: Re: Ferrari Digest, Vol 1, Issue 17

[Erik Nielsen (judge4re]

We tested the 365's speedo with GPS and found it to be +/- 1mph up to ~90
mph.  Haven't had a chance to confirm the 308 yet.  The Mondial is pretty
optimistic...


On 8/30/06, Rick Lindsay <rolindsay [at] yahoo.com> wrote:
> I have always wondered if those machines inflate the displayed
> speed.  Since they are to be a deterent, it is only a small step to tweeking
> them to display on the high side.
>
> rick questioner-of-everything lindsay
>
> JAshburne [at] aol.com wrote:
>
> About the only good use of police radar around here in CT is the unmanned
> radar displays that are designed to flash your speed at you in order to
> shame
> you into slowing down. They may well work for that purpose but I find that
> their best use is to calibrate my speedometer!
>
> John
>
>
> In a message dated 8/29/2006 6:17:40 P.M. Eastern Daylight Time,
> BRIGANDBAR [at] aol.com writes:
>
> In a message dated 8/29/2006 3:28:39 P.M. Central Standard Time,
> ferrari-request [at] ferrarilist.com writes:
>
> else just use a
> decent watch and time the mileage markers.
>
>
>
> Dennis et. al.
>
> I'd like to add a caveat here. Most mileage markers, particularly those
> simply listing highway mileage on a post without precision additions such
> as
> decimal point measurements, are notoriously inaccurate. These are not
> survey
>
> points, but informational signals. Additionally, mileage actually traveled
> on a
> roadway may be affected by things such as curves with varying radii, etc.
> And
> then there is always the parallax issue relating to trying to time points
> by
>
> visually starting and stopping a timing device. Add to those "reaction
> time"
>
> issues in starting and stopping the chronograph and the error factor is
> further altered. Will these cumulatively result in an error rate of
> +/-10%? Most
> probably not, but it is difficult to determine if the errors are
> cumulative,
>
> or offsetting. Actually, one of the best ways to determine actual speed
> (at
> least in some semblance of the legal speed limits, is to find a friendly
> state trooper or local police officer who has an interstate highway within
> his
> jurisdiction and "beat" and simply ask him to clock the car on radar
> (while
> setting speed parameters that do not result in the issuance of a
> citation).
> If
> this sounds absurd to you, trust me, after 30 years of experience within
> the
>
> "community" prior to retirement from the public sector, and being married
> to
> a Chief of Police with about the same tenure, I can assure you that many
> police officers are car enthusiasts such as ourselves. And we have a
> pretty
> significant advantage in that in most jurisdictions these officers have
> probably
> not even seen a Ferrari at all, let alone in a "close up" perspective. If
> you really want to add to their enthusiasm, invite them to ride in the
> car.
>
> Unless you are in So. CA or an affluent suburb of a major (prosperous)
> city
> he/she may be the only officer in the department that has ever ridden in a
> Ferrari. I the circumstances are appropriate, i.e., if the officer is a
> neighbor,
> acquaintance, etc., offer his/her kid a ride. You might even be surprised
> as
> to exactly what speeds can be checked without a citation at the right time
> and
> location.
>
> Dr. Steve
>
>
>
>
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