[DeTomaso] Stage 1 - Complete!

michael at michaelshortt.com michael at michaelshortt.com
Mon Mar 31 16:22:49 EDT 2008


How can the odometer be right and the speedo be wrong?

Michael in Savannah

On Mon, Mar 31, 2008 at 5:19 PM, <MikeLDrew at aol.com> wrote:

>
> In a message dated 3/30/08 15 45 13, ea2010 at yahoo.com writes:
>
>
> > 1. regarding the temp I was running ... it appears that - once warm - my
> > cat like to run just a sliver under 200F. I did punch it from 80 MPH to
> around
> > 110 MPH on a few occasions (I couldn't help myself!) in which case the
> temp
> > would rise just a sliver OVER 200F. But, all in all, I would say the car
> likes
> > to run at 200F. I am wondering if this is a normal temp to expect?
> >
> >>>That is just about ideal.   The critical thing is to see what temp the
> car
> runs when stationary.   You've already demonstrated that the cooling
> system
> is capable of keeping temps where they should be when subjected to airflow
> while underway.   If the temps are noticeably higher when you are stuck in
> traffic
> for a long time, the problem is the radiator fans--not the other
> components
> in the system.
>
> My car, like yours, runs around 200 degrees under all circumstances.   I
> did
> find that on extended high-speed runs through the desert (120 mph or so),
> the
> water temp would rise, then stabilize at about 230.   I think fitting a
> front
> air dam will have helped that situation, and I will also see about fitting
> some additional ducting if I can see any areas where airflow is being
> potentially
> lost (such as blocking off the holes in the bottom of the valance).
> >
> > 2. RPM's ... my cousin and I both seemed to think the car was running at
> > higher RPM's than indicated: 2000 at 65 MPH, 2200 at 75 MPH and 2500
> (dead on)
> > at 80 MPH. Without down-shifting, I was able to go from 80 to 100 MPH in
> 5th
> > without much pressure on the accelerator - immediate responsiveness. I
> am
> > thinking of getting the Tach tested and possibly re-calibrated. Would
> you agree?
> >
> >>>Unless somebody has seriously revamped your gearbox, I would agree,
> your
> tach seems to be reading low.
> >
> > 3. speed ... at 90 MPH on the speedo, my hand-held GPS showed a speed of
> 81
> > MPH. I realize that the tires I am running (245/45 front and 335/35 rear
> on
> > 17" wheels) are one reason for the discrepancy; however, should the
> speed be
> > off by that much?
> >
> >>>That sounds normal.   My speedometer also reads about 8 mph high at
> highway speeds, with 305/50-15 rear tires, but I think the odometer is
> almost
> spot-on.
>
> Mike
>
>
>
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-- 
Michael L. Shortt
Savannah, Georgia
www.michaelshortt.com
michael at michaelshortt.com
912-232-9390


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