Trusting the police radar units is shakey at best. you have to be the
ONLY person anywhere near them for the reading to be accurate. Best thing
to do is borrow a GPS unit and measure the speed that way. It should be
accurate to at least 0.5 MPH
Steve
tr6@kc4sw.com
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net]On
Behalf Of Thomas Gauthier
Sent: Monday, October 28, 2002 4:22 AM
To: 6pack@autox.team.net
Subject: speedometer error
List,
I am trying to figure out why the speedometer in my TR6 registers about 20
mph faster than actual in 4th gear. I have a 72 TR6 with no overdrive.
This is not a new problem, I have had it since I bought the car about 1.5
years ago.
The speedometer jumps around a bit, but in 4th gear at 3000 rpm it is
pretty stable, registering about 62 mph. The synchronization between the
tach and speedo are what you would expect based on TR6 gear ratios. I
have verified this for 4th gear only (I haven't checked the other gears).
The problem is that the actual speed (verified by driving alongside my
wife's car and by several passes by the local police speed sensing units -
you know the units that indicate your speed as you drive past) is about 20
mph less.
What is going on? The car came with 195 65 15 tires, but that shouldn't
make that much difference. Can I trust my tach? Do I have some kind of
crazy differential gear ratio?
Any help would be appreciated.
Thanks,
Tom
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