speedometer replacement

[Ralph]

Hi Curt:

Most tire manufactures will have the diameter of their product and will convert that to per mile revs. I run 11 R 22.5 kumoho and the spec is 502 revs per mile. The Mich same size tire turns 501 per mile. As a for instance.

We all run the magnetic pick up that counts the notches on the inside of the break drum. The count for the notches on Birds are 60. And most of the Birds speedometer face value is 0 to 85 mph and with the Teleflex the constant for the 0 to 85 gauge is 0.0236.

So step one of finding the binary switch set up starts with

501 x 60 x 0.0236 = 710.832
This number is the HZ rate

Now we take the HZ rate number and divide it by 23.61, which is the constant for the divide number and will give the binary number that is set up on the program switches in the unit.

710.832 ÷ 23.61 = 30.107. Or rounded up or down to the nearest whole number is 30 and 30 is the binary number for my system.

Now we know the binary divide number and the HZ rate and that let's us program the switches.

The list for the switches is found on the following web site and is in PDF

http://www.v3instruments.com/industrial_...do_odo.pdf


Safe travels, Ralph Charolette Fullenwider
'84 FC35 "Ruff Diamond"
Duncan, Oklahoma
Sent via BlackBerry by AT&T

---

From: Curt Sprenger

Sender: WanderlodgeForum@yahoogroups.com

Date: Fri, 26 Aug 2011 20:58:31 -0700

To:

ReplyTo: WanderlodgeForum@yahoogroups.com

Subject: Re: [WanderlodgeForum] Re: speedometer replacement

The Michelin site shows the RPMs per tire size...don't know about the other tire manufactures.

CurtSprenger
1987 PT38 8V92 "MacAttack Racing"
Anaheim Hills, CA
"curtsprenger@gmail.com"

One of the "Birds of a Feather" (BOF) Organizers

On Fri, Aug 26, 2011 at 8:38 PM, Ralph <"rlf47@swbell.net"> wrote:

 

Hi Bob




The hardest part is going on line to the tire manufacture and find the tire specs for your drive tires. Your looking for how many revolutions your drive tire makes in 1 mile. The rest falls into line.

Safe travels, Ralph & Charolette Fullenwider


'84 FC35 "Ruff Diamond"


Duncan, Oklahoma


Sent via BlackBerry by AT&T




-----Original Message-----


From: "oceanshores98569" <"bobandarlene%40earthlink.net">


Sender: "WanderlodgeForum%40yahoogroups.com"


Date: Sat, 27 Aug 2011 03:15:03

To: <"WanderlodgeForum%40yahoogroups.com">


Reply-To: "WanderlodgeForum%40yahoogroups.com"


Subject: [WanderlodgeForum] Re: speedometer replacement








--- In "WanderlodgeForum%40yahoogroups.com", "cape0001" <sbirtles@...> wrote:


>


> thank you ralph

> I have other gauges be sure to call and make sure I Have the gauge you want


> Stephen 97 BMC 37

> 888 668 4288


>

>

> --- In "WanderlodgeForum%40yahoogroups.com", "Ralph L. Fullenwider" wrote:


> >


> > There was a thread on this some time back about a speedo replacement from

> > Stephen B. I ordered one as well and had no problem in figuring the math

> > and programming the new speedo. What I did have a problem with was an extra

> > wire coming from the back of the unit, one was grey and the other blue. The

> > grey powers the hot side of the magnetic sensor, I took the blue to be a

> > ground and was wrong about the blue, removed it out of the circuit and the

> > speedo worked very well.


> >

> > I found some calculations on line for the programming. my tires rotate 502

> > times per mile and that times 60 teeth on the BB drive drum times the

> > constant give you the ones and 10's binary switch positions and using the

> > sum of that equation plugged into a second constant give you the hz rate

> > figure to set the switches up with. Speedo is good and replaces the

> > original exactly. Thanks Steve


> >

> > Safe travels,


> >

> > Ralph and Charolette Fullenwider


> > "84FC35 "Ruff Diamond"


> > Duncan, Oklahoma


> >


Didn't know Stephen had speedos for sale.


If I can get one, can you help me set up mine also??










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