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<  Off Road Go Kart & Mini Buggy Discussion  ~  Speedometer Yerf Dog Gx150
jtramseyjr
Post Sun Sep 21, 2008 2:14 pm 
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Anyone remember how to calibrate the schwinn speedometer that was used on the Yerfs from Yerfer.net.Thanks James
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pghruby
Post Mon Sep 22, 2008 12:25 am 
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In the Schwinn setup there is place to set wheel circumference. Measure the distance required for the front wheel to travel one full revolution in mm and input that number into your speedometer.You should be getting a number close to 1600 mm for a 20" tire.
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TeamHog
Post Mon Sep 22, 2008 7:15 pm 
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Remember, it's not the diameter of the tire, it's the circumference that the magnet travels. Most of the time this is the approx. circumference of the rim.
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'04 Yerf-Dog 3206 10g Rollers, 1500# Spring, Reverse, SuperTrapp, Uni
'04 KPX Xterro: pumper carb, oil cooling, 10g rollers, Junkies pipe, Uni
'05 Blade 150 DX: 4 Valve head, 10g rollers, East Side pipe, Uni
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pghruby
Post Mon Sep 22, 2008 7:43 pm 
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Chris -

It is the circumference of the tire that determines the measurement. The height of the tire will determine how much ground you cover per rotation. Varying magnet and sensor placement will still yield the same number of mm per revolution. Placing the magnet closer to the outside of the wheel will cause a short duration pulse at the same interval as placing it closer tot the hub and getting a longer pulse.

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08 Joyner SandViper 250
07 Joyner SandSpider 650
06 Tank Urban Touring 150SE
04 Yerf-Dog Spiderbox 4209 GX150 (SOLD)
04 Yerf-Dog Spiderbox 3206 GX150
81 Honda Passport C70B



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TeamHog
Post Mon Sep 22, 2008 7:50 pm 
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pghruby wrote:
Chris -

It is the circumference of the tire that determines the measurement. The height of the tire will determine how much ground you cover per rotation. Varying magnet and sensor placement will still yield the same number of mm per revolution. placing the magnet closer to the outside of the wheel will cause a short duration pulse at the same interval as placing it closer tot the hub and getting a longer pulse.


I understand that...

We're saying the same thing..
Moving the magenet/sensor does have an affect on the speedometer calibration.

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Chris Dierkens
'04 Yerf-Dog 3206 10g Rollers, 1500# Spring, Reverse, SuperTrapp, Uni
'04 KPX Xterro: pumper carb, oil cooling, 10g rollers, Junkies pipe, Uni
'05 Blade 150 DX: 4 Valve head, 10g rollers, East Side pipe, Uni
www.northeastbuggy.com



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guy48065
Post Tue Sep 23, 2008 10:04 pm 
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TeamHog wrote:
pghruby wrote:
Chris -

It is the circumference of the tire that determines the measurement. The height of the tire will determine how much ground you cover per rotation. Varying magnet and sensor placement will still yield the same number of mm per revolution. placing the magnet closer to the outside of the wheel will cause a short duration pulse at the same interval as placing it closer tot the hub and getting a longer pulse.


I understand that...

We're saying the same thing..
Moving the magenet/sensor does have an affect on the speedometer calibration.

Actually you're not. Rim size or location of the magnet makes no difference. The magnet makes 1 revolution with the tire regardless at what radius it's mounted. The only measurement that matters is the circumference of the contact area of the tire. There's a small "fudge factor" involved due to tire inflation & how much "squish" there is at the bottom so it's really best to play with the input number to get the speedo readout to agree with a GPS but you'll get very close with the measured circ. or by calculating it by multiplying the tire height (mm) X 3.1416.

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jtramseyjr
Post Tue Sep 23, 2008 11:19 pm 
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Thanks I found the Instructions today.Got to get the magnet and hook it all back up.
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TeamHog
Post Tue Sep 23, 2008 11:34 pm 
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guy48065 wrote:
Actually you're not. Rim size or location of the magnet makes no difference. The magnet makes 1 revolution with the tire regardless at what radius it's mounted. The only measurement that matters is the circumference of the contact area of the tire. There's a small "fudge factor" involved due to tire inflation & how much "squish" there is at the bottom so it's really best to play with the input number to get the speedo readout to agree with a GPS but you'll get very close with the measured circ. or by calculating it by multiplying the tire height (mm) X 3.1416.


You're right, I don't know what I was thinking. Too many sleepness work nights.

I was thinking of a particular pulse generation on a turbine/generator set. Similar but different....

Sorry

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Chris Dierkens
'04 Yerf-Dog 3206 10g Rollers, 1500# Spring, Reverse, SuperTrapp, Uni
'04 KPX Xterro: pumper carb, oil cooling, 10g rollers, Junkies pipe, Uni
'05 Blade 150 DX: 4 Valve head, 10g rollers, East Side pipe, Uni
www.northeastbuggy.com



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MikeK
Post Wed Sep 24, 2008 5:06 pm 
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You guys made my head hurt. Brick wall

Just run WOT next to a vehicle and have THEM tell you how fast. Sounds a lot easier!!!! Razz

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TeamHog
Post Wed Sep 24, 2008 5:16 pm 
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MikeK wrote:
You guys made my head hurt. Brick wall

Just run WOT next to a vehicle and have THEM tell you how fast. Sounds a lot easier!!!! Razz


Hey, if they pull you over you're going too fast... Otherwise you still need to mod.

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Chris Dierkens
'04 Yerf-Dog 3206 10g Rollers, 1500# Spring, Reverse, SuperTrapp, Uni
'04 KPX Xterro: pumper carb, oil cooling, 10g rollers, Junkies pipe, Uni
'05 Blade 150 DX: 4 Valve head, 10g rollers, East Side pipe, Uni
www.northeastbuggy.com



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