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RPM and 'actual' speed

To: "steven@cravetechnology.com" <steven@cravetechnology.com>
Subject: RPM and 'actual' speed
From: David Massey <105671.471@compuserve.com>
Date: Fri, 16 Jun 2000 22:35:12 -0400
Cc: Triumph Mailing List <triumphs@autox.team.net> charset=ISO-8859-1
Message text written by "steven@cravetechnology.com"
>My speedo wanders -- in part, due to the 30 foot long speedo cable <g>
installed by the DPO -- and I've verified that the reading is off by
about 20% using convenient radar-enabled signs. After putting giant
tires on my old jeep, I learned to recalculate MPH on the fly, but I was
thinking that there must be a formula to convert the tach reading to
MPH.
<

On your TR2,3,4,250, or 6 divide the tach reading by two (in fourth).  In
second take your tach reading direct.  The other gears are more difficult.

Dave

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