Speedometer programming

[Don Bradner]

A followup on the speedometer: Mine was set for "10" (2+8), and the factory
called for 26 - switches 2,3 and 6 which are 2+4+20. I set that, and it still
read substantially high. I set 40 (switch 7 only) and the speedometer was about
20% low. Set 34 (switches 3, 5, 6, which is 4+10+20), and I was 5% low, then 32
(switches 2, 5, 6) and I was essentially dead on.

This was done over a trip of 150 miles today, and during it I also set my
digital VMSpc speedometer to dead on - it was 1.8% fast over 10 miles of flat
desert at exactly 60mph. I now have two accurate speedometers, analog and
digital.

From this I conclude that the dip switches are additive, as shown above, and the
higher the combined number the more they take off the speed.

In the various invoices I have with this coach are two for transmission ECU
replacements, with the symptom being initially a lack of any speedometer reading
at all, and the second a couple of days later when the "new" replacement failed
completely. The shop which replaced both (second under warranty, of course)
noted that they could not get a second identical one either new or reman, so
used a reman "+2" unit.

I don't know what that means, but I assume it is somehow different, and probably
doesn't put out the same speed data as the original, which is why factory
programming didn't work.

On 2/4/2007 at 3:45 PM Don Bradner wrote:

>The speedometer on 90 PT40 reads roughly 15-20% high. Presumably racks up
>miles at a higher rate as well.
>
>The VMSpc speed reading appears to be just about dead on; I would like to
>improve the accuracy of the speedometer, and I wondered if anyone here has
>any info on the programming?
>
>On the back are 12 dip switches. 1-4 are labled "Ones" and 1, 2, 4, 8. 5-8
>ae labled "Tens" and 10, 20, 40, 80. 9-12 are labeled "Filter."
>
>Only 2 and 4 are on (values 2 and 8).
>
>This is an obvious question for Bluebird tech support, but so far on other
>issues I'm batting .000 with them (meaning I have yet to talk to a human)
>so I thought I would ask on the forums first in case someone has
>previously received programming info.

Don Bradner
90 PT40 "Blue Thunder"