VSS-Figuring Which Speedo Gear????

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VSS-Figuring Which Speedo Gear????

Post by u10072 at hotmail.com » Fri Dec 03, 2004 5:59 pm

Hello All,
Ok I am still doing numerous wiring jobs on the bronco while winter looms.
My question is how do you figure the number of speedo gear teeth you need?

For example I have a C4, 4.56 gears, and 35" tires----so what gear do I need
teeth wise and how do I get the answer which is honestly the most important
part! Then I guess you go to broncohio.com and it will give you the part
#??

thanks,
Matt lane

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hest
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VSS-Figuring Which Speedo Gear????

Post by hest » Fri Dec 03, 2004 6:23 pm

I was pretty unscientific there, too. The transmission doesn't matter in
the calculation- the drive gear for the speedometer is on the output shaft
of the transfer case. I got mine together and drove it. The speedometer
indicated that I was going a lot faster than I really was (what's "a lot",
you ask? I can't remember- maybe 7 or 8 mph high). I then pulled the VSS
back out (I had simply transferred the gear that came stock on my Bronco's
speedometer cable over to the VSS) and counted the number of teeth on the
gear. I then went to http://www.broncohio.com/tech/calculations.html and
got the part number for the gear with two more teeth (I think- it's been 3
years) than what I had on there, and bought that gear. I got lucky, as it
put it nearly right on. That was with 33" tires & 4.10 gears. When I went
to 35" tires, I had the opposite problem- now the speedometer read too
slow, so I went back and bought a gear with one tooth less. Again, a pretty
good match. Lucky me, I put bigger tires on our Expedition, which meant
that its speedo was off too. Amazingly it used the exact same gears, and
the one I needed turned out to be the one left over from my Bronco experiments.

Lars Pedersen
Davis, CA

At 18:00 12/03/2004 -0700, you wrote:
>Hello All,
>Ok I am still doing numerous wiring jobs on the bronco while winter looms.
>My question is how do you figure the number of speedo gear teeth you need?
>
>For example I have a C4, 4.56 gears, and 35" tires----so what gear do I
>need teeth wise and how do I get the answer which is honestly the most
>important part! Then I guess you go to broncohio.com and it will give you
>the part #??
>
>thanks,
>Matt lane
>
>_________________________________________________________________
>Express yourself instantly with MSN Messenger! Download today - it's FREE!
>hthttp://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>
>********************* BFix Site Sponsor ****************************
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VSS-Figuring Which Speedo Gear????

Post by 744x4 » Fri Dec 03, 2004 6:42 pm

Acording to my Garmin GPS mine is exactly the same as when I had 3.50 gears
and 235-75-15 tires as it is now with 4.30 gears and 35 in tires so I got
lucky using the stock gear.
----- Original Message -----
From: "Lars Pedersen" <lpedersen@ucdavis.edu>
To: <mail@broncofix.com>
Sent: Friday, December 03, 2004 8:25 PM
Subject: Re: [Bfix] VSS-Figuring Which Speedo Gear????


> I was pretty unscientific there, too. The transmission doesn't matter in
> the calculation- the drive gear for the speedometer is on the output shaft
> of the transfer case. I got mine together and drove it. The speedometer
> indicated that I was going a lot faster than I really was (what's "a lot",
> you ask? I can't remember- maybe 7 or 8 mph high). I then pulled the VSS
> back out (I had simply transferred the gear that came stock on my Bronco's
> speedometer cable over to the VSS) and counted the number of teeth on the
> gear. I then went to http://www.broncohio.com/tech/calculations.html and
> got the part number for the gear with two more teeth (I think- it's been 3
> years) than what I had on there, and bought that gear. I got lucky, as it
> put it nearly right on. That was with 33" tires & 4.10 gears. When I went
> to 35" tires, I had the opposite problem- now the speedometer read too
> slow, so I went back and bought a gear with one tooth less. Again, a
pretty
> good match. Lucky me, I put bigger tires on our Expedition, which meant
> that its speedo was off too. Amazingly it used the exact same gears, and
> the one I needed turned out to be the one left over from my Bronco
experiments.
>
> Lars Pedersen
> Davis, CA
>
> At 18:00 12/03/2004 -0700, you wrote:
> >Hello All,
> >Ok I am still doing numerous wiring jobs on the bronco while winter
looms.
> >My question is how do you figure the number of speedo gear teeth you
need?
> >
> >For example I have a C4, 4.56 gears, and 35" tires----so what gear do I
> >need teeth wise and how do I get the answer which is honestly the most
> >important part! Then I guess you go to broncohio.com and it will give
you
> >the part #??
> >
> >thanks,
> >Matt lane
> >
> >_________________________________________________________________
> >Express yourself instantly with MSN Messenger! Download today - it's
FREE!
> >hthttp://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
> >
> >********************* BFix Site Sponsor ****************************
> >Cage Offroad Suspension lifts, Offroad accessories and more!
> >http://www.cageoffroad.com
> ><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
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>
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IronBenderII
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VSS-Figuring Which Speedo Gear????

Post by IronBenderII » Fri Dec 03, 2004 6:46 pm

Lars, I was expecting to see a 4 page equation on how
you got if figured out. Trial and error is for us
simple folk, lol.

Jack

--- Lars Pedersen <lpedersen@ucdavis.edu> wrote:

> I was pretty unscientific there, too. The
> transmission doesn't matter in
> the calculation- the drive gear for the speedometer
> is on the output shaft
> of the transfer case. I got mine together and drove
> it. The speedometer
> indicated that I was going a lot faster than I
> really was (what's "a lot",
> you ask? I can't remember- maybe 7 or 8 mph high). I
> then pulled the VSS
> back out (I had simply transferred the gear that
> came stock on my Bronco's
> speedometer cable over to the VSS) and counted the
> number of teeth on the
> gear. I then went to
> http://www.broncohio.com/tech/calculations.html and
> got the part number for the gear with two more teeth
> (I think- it's been 3
> years) than what I had on there, and bought that
> gear. I got lucky, as it
> put it nearly right on. That was with 33" tires &
> 4.10 gears. When I went
> to 35" tires, I had the opposite problem- now the
> speedometer read too
> slow, so I went back and bought a gear with one
> tooth less. Again, a pretty
> good match. Lucky me, I put bigger tires on our
> Expedition, which meant
> that its speedo was off too. Amazingly it used the
> exact same gears, and
> the one I needed turned out to be the one left over
> from my Bronco experiments.
>
> Lars Pedersen
> Davis, CA
>
> At 18:00 12/03/2004 -0700, you wrote:
> >Hello All,
> >Ok I am still doing numerous wiring jobs on the
> bronco while winter looms.
> >My question is how do you figure the number of
> speedo gear teeth you need?
> >
> >For example I have a C4, 4.56 gears, and 35"
> tires----so what gear do I
> >need teeth wise and how do I get the answer which
> is honestly the most
> >important part! Then I guess you go to
> broncohio.com and it will give you
> >the part #??
> >
> >thanks,
> >Matt lane
> >
>
>_________________________________________________________________
> >Express yourself instantly with MSN Messenger!
> Download today - it's FREE!
>
>hthttp://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
> >
> >********************* BFix Site Sponsor
> ****************************
> >Cage Offroad Suspension lifts, Offroad
> accessories and more!
> >http://www.cageoffroad.com
>
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> admin@broncofix.com
>
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> ****************************
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> accessories and more!
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> admin@broncofix.com
>


=====
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435/D20
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u10072 at hotmail.com

VSS-Figuring Which Speedo Gear????

Post by u10072 at hotmail.com » Fri Dec 03, 2004 8:00 pm

Ok, so trial & error seems to work great, and to quantify the data use a
GPS. I got that but how about another question.

***When going to a different speedo gear are you to go more or less with the
teeth? Come on smart guys there has to be a better way than to just guess
at the damn thing!!!!!!!! If you can answer that then all I have to do is
get the figure stock RPM at a given tire/gear combo vs. that modified and
then change the gear to that.

Matt

>From: Lars Pedersen <lpedersen@ucdavis.edu>
>To: mail@broncofix.com
>Subject: Re: [Bfix] VSS-Figuring Which Speedo Gear???? Date: Fri, 03 Dec
>2004 17:25:49 -0800
>
>I was pretty unscientific there, too. The transmission doesn't matter in
>the calculation- the drive gear for the speedometer is on the output shaft
>of the transfer case. I got mine together and drove it. The speedometer
>indicated that I was going a lot faster than I really was (what's "a lot",
>you ask? I can't remember- maybe 7 or 8 mph high). I then pulled the VSS
>back out (I had simply transferred the gear that came stock on my Bronco's
>speedometer cable over to the VSS) and counted the number of teeth on the
>gear. I then went to http://www.broncohio.com/tech/calculations.html and
>got the part number for the gear with two more teeth (I think- it's been 3
>years) than what I had on there, and bought that gear. I got lucky, as it
>put it nearly right on. That was with 33" tires & 4.10 gears. When I went
>to 35" tires, I had the opposite problem- now the speedometer read too
>slow, so I went back and bought a gear with one tooth less. Again, a pretty
>good match. Lucky me, I put bigger tires on our Expedition, which meant
>that its speedo was off too. Amazingly it used the exact same gears, and
>the one I needed turned out to be the one left over from my Bronco
>experiments.
>
>Lars Pedersen
>Davis, CA
>
>At 18:00 12/03/2004 -0700, you wrote:
>>Hello All,
>>Ok I am still doing numerous wiring jobs on the bronco while winter looms.
>>My question is how do you figure the number of speedo gear teeth you need?
>>
>>For example I have a C4, 4.56 gears, and 35" tires----so what gear do I
>>need teeth wise and how do I get the answer which is honestly the most
>>important part! Then I guess you go to broncohio.com and it will give you
>>the part #??
>>
>>thanks,
>>Matt lane
>>
>>_________________________________________________________________
>>Express yourself instantly with MSN Messenger! Download today - it's FREE!
>>hthttp://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>>
>>********************* BFix Site Sponsor ****************************
>>Cage Offroad Suspension lifts, Offroad accessories and more!
>>http://www.cageoffroad.com
>><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
>>List help? http://www.broncofix.com or email to: admin@broncofix.com
>
>********************* BFix Site Sponsor ****************************
>Cage Offroad Suspension lifts, Offroad accessories and more!
>http://www.cageoffroad.com
><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
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VSS-Figuring Which Speedo Gear????

Post by CraigS » Fri Dec 03, 2004 8:51 pm

teeth = y
speed = x

function = x/y

add 1 tooth

speedo cable rpm = x/y+1

function is getting smaller therefore the cable isn't turning as fast.
more teeth slow down the speedo.


u100 72 wrote:

> Ok, so trial & error seems to work great, and to quantify the data use
> a GPS. I got that but how about another question.
>
> ***When going to a different speedo gear are you to go more or less
> with the teeth? Come on smart guys there has to be a better way than
> to just guess at the damn thing!!!!!!!! If you can answer that then
> all I have to do is get the figure stock RPM at a given tire/gear
> combo vs. that modified and then change the gear to that.
>
> Matt
>
>> From: Lars Pedersen <lpedersen@ucdavis.edu>
>> To: mail@broncofix.com
>> Subject: Re: [Bfix] VSS-Figuring Which Speedo Gear???? Date: Fri, 03
>> Dec 2004 17:25:49 -0800
>>
>> I was pretty unscientific there, too. The transmission doesn't matter
>> in the calculation- the drive gear for the speedometer is on the
>> output shaft of the transfer case. I got mine together and drove it.
>> The speedometer indicated that I was going a lot faster than I really
>> was (what's "a lot", you ask? I can't remember- maybe 7 or 8 mph
>> high). I then pulled the VSS back out (I had simply transferred the
>> gear that came stock on my Bronco's speedometer cable over to the
>> VSS) and counted the number of teeth on the gear. I then went to
>> http://www.broncohio.com/tech/calculations.html and got the part
>> number for the gear with two more teeth (I think- it's been 3 years)
>> than what I had on there, and bought that gear. I got lucky, as it
>> put it nearly right on. That was with 33" tires & 4.10 gears. When I
>> went to 35" tires, I had the opposite problem- now the speedometer
>> read too slow, so I went back and bought a gear with one tooth less.
>> Again, a pretty good match. Lucky me, I put bigger tires on our
>> Expedition, which meant that its speedo was off too. Amazingly it
>> used the exact same gears, and the one I needed turned out to be the
>> one left over from my Bronco experiments.
>>
>> Lars Pedersen
>> Davis, CA
>>
>> At 18:00 12/03/2004 -0700, you wrote:
>>
>>> Hello All,
>>> Ok I am still doing numerous wiring jobs on the bronco while winter
>>> looms.
>>> My question is how do you figure the number of speedo gear teeth you
>>> need?
>>>
>>> For example I have a C4, 4.56 gears, and 35" tires----so what gear
>>> do I need teeth wise and how do I get the answer which is honestly
>>> the most important part! Then I guess you go to broncohio.com and
>>> it will give you the part #??
>>>
>>> thanks,
>>> Matt lane
>>>
>>> _________________________________________________________________
>>> Express yourself instantly with MSN Messenger! Download today - it's
>>> FREE! hthttp://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>>>
>>> ********************* BFix Site Sponsor ****************************
>>> Cage Offroad Suspension lifts, Offroad accessories and more!
>>> http://www.cageoffroad.com
>>> <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
>>> List help? http://www.broncofix.com or email to: admin@broncofix.com
>>
>>
>> ********************* BFix Site Sponsor ****************************
>> Cage Offroad Suspension lifts, Offroad accessories and more!
>> http://www.cageoffroad.com
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>
>
> _________________________________________________________________
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>


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Joel
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VSS-Figuring Which Speedo Gear????

Post by Joel » Fri Dec 03, 2004 9:55 pm

The answer depends on what changes you have made.  Here is my solution.  Use a GPS or a stopwatch and milemarkers to find what your actual speed is vs. your speedometer reading.  Then count the teeth on your speedo driven gear (this is the one on the end of the cable that goes in the T-case.)  Take these numbers and solve the equation to determine what gear you need.
 
Speedometer reading / # of teeth on gear = Actual speed / x
x = number of teeth on gear you need
 
You will most likely have to round to the nearest whole number.
All other things being equal, fewer teeth on the gear will make the speedo read faster, more teeth on the gear will make it read slower.

u100 72 <u10072@hotmail.com> wrote:
Ok, so trial & error seems to work great, and to quantify the data use a
GPS. I got that but how about another question.

***When going to a different speedo gear are you to go more or less with the
teeth? Come on smart guys there has to be a better way than to just guess
at the damn thing!!!!!!!! If you can answer that then all I have to do is
get the figure stock RPM at a given tire/gear combo vs. that modified and
then change the gear to that.

Matt

>From: Lars Pedersen
>To: mail@broncofix.com
>Subject: Re: [Bfix] VSS-Figuring Which Speedo Gear???? Date: Fri, 03 Dec
>2004 17:25:49 -0800
>
>I was pretty unscientific there, too. The transmission doesn't matter in
>the calculation- the drive gear for the speedometer is on the output shaft
>of the transfer case. I got mine together and drove it. The speedometer
>indicated that I was going a lot faster than I really was (what's "a lot",
>you ask? I can't remember- maybe 7 or 8 mph high). I then pulled the VSS
>back out (I had simply transferred the gear that came stock on my Bronco's
>speedometer cable over to the VSS) and counted the number of teeth on the
>gear. I then went to http://www.broncohio.com/tech/calculations.html and
>got the part number for the gear with two more teeth (I think- it's been 3
>years) than what I had on there, and bought that gear. I got lucky, as it
>put it nearly right on. That was with 33" tires & 4.10 gears. When I went
>to 35" tires, I had the opposite problem- now the speedometer read too
>slow, so I went back and bought a gear with one tooth less. Again, a pretty
>good match. Lucky me, I put bigger tires on our Expedition, which meant
>that its speedo was off too. Amazingly it used the exact same gears, and
>the one I needed turned out to be the one left over from my Bronco
>experiments.
>
>Lars Pedersen
>Davis, CA
>
>At 18:00 12/03/2004 -0700, you wrote:
>>Hello All,
>>Ok I am still doing numerous wiring jobs on the bronco while winter looms.
>>My question is how do you figure the number of speedo gear teeth you need?
>>
>>For example I have a C4, 4.56 gears, and 35" tires----so what gear do I
>>need teeth wise and how do I get the answer which is honestly the most
>>important part! Then I guess you go to broncohio.com and it will give you
>>the part #??
>>
>>thanks,
>>Matt lane
>>
>>_________________________________________________________________
>>Express yourself instantly with MSN Messenger! Download today - it's FREE!
>>hthttp://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>>
>>********************* BFix Site Sponsor ****************************
>>Cage Offroad Suspension lifts, Offroad accessories and more!
>>http://www.cageoffroad.com
>><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
>>List help? http://www.broncofix.com or email to: admin@broncofix.com
>
>********************* BFix Site Sponsor ****************************
>Cage Offroad Suspension lifts, Offroad accessories and more!
>http://www.cageoffroad.com
><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
>List help? http://www.broncofix.com or email to: admin@broncofix.com

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Joel
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VSS-Figuring Which Speedo Gear????

Post by Joel » Fri Dec 03, 2004 10:12 pm

Whoops, flip flop the numbers to make that work out right.
 
Should read:
Acutal Speed / # of teeth on gear = Speedometer reading / x

Joel Davis <joeledavis@yahoo.com> wrote:
The answer depends on what changes you have made.  Here is my solution.  Use a GPS or a stopwatch and milemarkers to find what your actual speed is vs. your speedometer reading.  Then count the teeth on your speedo driven gear (this is the one on the end of the cable that goes in the T-case.)  Take these numbers and solve the equation to determine what gear you need.
 
Speedometer reading / # of teeth on gear = Actual speed / x
x = number of teeth on gear you need
 
You will most likely have to round to the nearest whole number.
All other things being equal, fewer teeth on the gear will make the speedo read faster, more teeth on the gear will make it read slower.

u100 72 <u10072@hotmail.com> wrote:
Ok, so trial & error seems to work great, and to quantify the data use a
GPS. I got that but how about another question.

***When going to a different speedo gear are you to go more or less with the
teeth? Come on smart guys there has to be a better way than to just guess
at the damn thing!!!!!!!! If you can answer that then all I have to do is
get the figure stock RPM at a given tire/gear combo vs. that modified and
then change the gear to that.

Matt

>From: Lars Pedersen
>To: mail@broncofix.com
>Subject: Re: [Bfix] VSS-Figuring Which Speedo Gear???? Date: Fri, 03 Dec
>2004 17:25:49 -0800
>
>I was pretty unscientific there, too. The transmission doesn't matter in
>the calculation- the drive gear for the speedometer is on the output shaft
>of the transfer case. I got mine together and drove it. The speedometer
>indicated that I was going a lot faster than I really was (what's "a lot",
>you ask? I can't remember- maybe 7 or 8 mph high). I then pulled the VSS
>back out (I had simply transferred the gear that came stock on my Bronco's
>speedometer cable over to the VSS) and counted the number of teeth on the
>gear. I then went to http://www.broncohio.com/tech/calculations.html and
>got the part number for the gear with two more teeth (I think- it's been 3
>years) than what I had on there, and bought that gear. I got lucky, as it
>put it nearly right on. That was with 33" tires & 4.10 gears. When I went
>to 35" tires, I had the opposite problem- now the speedometer read too
>slow, so I went back and bought a gear with one tooth less. Again, a pretty
>good match. Lucky me, I put bigger tires on our Expedition, which meant
>that its speedo was off too. Amazingly it used the exact same gears, and
>the one I needed turned out to be the one left over from my Bronco
>experiments.
>
>Lars Pedersen
>Davis, CA
>
>At 18:00 12/03/2004 -0700, you wrote:
>>Hello All,
>>Ok I am still doing numerous wiring jobs on the bronco while winter looms.
>>My question is how do you figure the number of speedo gear teeth you need?
>>
>>For example I have a C4, 4.56 gears, and 35" tires----so what gear do I
>>need teeth wise and how do I get the answer which is honestly the most
>>important part! Then I guess you go to broncohio.com and it will give you
>>the part #??
>>
>>thanks,
>>Matt lane
>>
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VSS-Figuring Which Speedo Gear????

Post by broncomarc at nuvox.net » Sat Dec 04, 2004 9:24 am

If your Bronco is drivable, why not just follow the directions on my website
to figure out what gear you need?
http://www.broncohio.com/tech/calculations.html


- Marc Reiter
Cincinnati, BroncOhio
1973 Bronco - http://www.broncomarc.com/bronco/
BroncOhio - http://www.broncohio.com/


----- Original Message -----
From: "u100 72" <u10072@hotmail.com>
To: <mail@broncofix.com>
Sent: Friday, December 03, 2004 8:00 PM
Subject: [Bfix] VSS-Figuring Which Speedo Gear????


> Hello All,
> Ok I am still doing numerous wiring jobs on the bronco while winter looms.
> My question is how do you figure the number of speedo gear teeth you need?
>
> For example I have a C4, 4.56 gears, and 35" tires----so what gear do I
> need teeth wise and how do I get the answer which is honestly the most
> important part! Then I guess you go to broncohio.com and it will give you
> the part #??
>
> thanks,
> Matt lane
>
********************* BFix Site Sponsor ****************************
Cage Offroad Suspension lifts, Offroad accessories and more!
http://www.cageoffroad.com
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
List help? http://www.broncofix.com or email to: admin@broncofix.com

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