[DeTomaso] Speedometer/odometer errors
Curt Hall
cuvee at sbcglobal.net
Tue Apr 1 20:57:37 EDT 2008
Hey Mike...
While Pete and I were in Sacramento we used Pete's GPS and at 80 mph my car's speedometer read 80mph? With the same BFG 305/50/15?
Strange
Curt
MikeLDrew at aol.com wrote:
Hi guys,
With reference to our earlier discussion about speedometer vs. odometer
errors, and in light of the fact that Jim Seiferling stopped by yesterday and
hooked up my cigarette lighter outlet for me (among other things--thanks again
Jim!), I decided to install my GPS in my Pantera and take it for a quick drive
(also to verify that my mongo fuel filter has temporarily fixed my fuel
starvation problem, which it has).
My car is fitted with the standard 4.22 differential, and BFG 305/50-15 rear
tires, which are among the tallest tires out there, measuring 27.1 inches tall
according to BFG's website (data extracted in 2005, no longer published
there, thankfully I downloaded the PDF file).
Here are the results:
Indicated on speedometer: 80 mph
GPS reading: 75 mph
Distance travelled on odometer: 22.55 miles
Distance travelled by GPS: 21.98 miles
Engine rpm at indicated 80 mph/actual 75 mph: 3400
Max speed attained: 96.2 mph :>)
So, in both cases, the instrument reads higher than actuality, although the
difference isn't that bad. If the car was fitted with smaller rear tires
(such as 335/35-17s that many of you run, which are only 26 inches and some
change), the delta would be correspondingly greater; I would estimate 10 mph
difference at 80 mph for most cars and a correspondingly greater odometer reading as
well.
BTW, it's a beautiful day here in northern California, and even though I only
had a half-hour or so to spare, it sure was good for the soul to take it for
a spin...:>)
Mike
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