Jaycar Speedo Corrector

[SpudRider]

Originally Posted by Weldangrind

This would be my approach: http://en.wikipedia.org/wiki/Self-amalgamating_tape

As always, thanks for the great tip, Weld.

You can buy the Scotch brand of that tape at Lowes.

http://www.lowes.com/pd_158594-98-22...ductId=3127861

[SpudRider]

If Qwerty wants one of these controllers, we are already half way to the minimum order of ten units. Of course, the more we order, the better, since the individual cost of shipping each unit from Australia drops as the number of units increases.

[SpudRider]

I pretty certain applying some RTV around the wiring grommets and the case seam will seal this unit very well. Plus, I think the unit will be very well protected, even while washing the motorcycle, if it is located under the dashboard, behind the windshield. Of course, mounting the unit under the pillion saddle will provide even more protection from moisture.

[3banger]

I'm in.

Have we ever confirmed how this will also effect the odometer? I know it sounds like an obvious yes. But on my Triumph Sprint ST the speedo reads 5% fast confirmed with GPS but odometer is almost dead-on with GPS data. The speedo error is therefor programmed in on purpose.

[SpudRider]

Originally Posted by 3banger

I'm in.

Have we ever confirmed how this will also effect the odometer? I know it sounds like an obvious yes. But on my Triumph Sprint ST the speedo reads 5% fast confirmed with GPS but odometer is almost dead-on with GPS data. The speedo error is therefor programmed in on purpose.

Thank you.

I think the only way to know is to ride a measured mile, and compare the reading on the odometer.

I have compared my speedometer to my Garmin GPS receiver, and the speedometer is definitely a little over 10 percent 'optimistic.'

[fishman10]

I'm in too ,Spud!

[SpudRider]

Originally Posted by 3banger

I'm in.

Have we ever confirmed how this will also effect the odometer? I know it sounds like an obvious yes. But on my Triumph Sprint ST the speedo reads 5% fast confirmed with GPS but odometer is almost dead-on with GPS data. The speedo error is therefor programmed in on purpose.

I just completed a 12-mile ride across town for groceries. I mounted my Garmin GPS receiver, and recorded the odometer setting. Then I zeroed the trip odometer on the RX3 before departing.

I don't know the accuracy of a GPS odometer. However, here are the results.

Trip distance recorded by Garmin GPS receiver: 12.1 miles
Trip distance recorded by Zongshen RX3 odometer: 12.8 miles

My Garmin GPS receiver records hundredths of a mile, while the RX3 odometer only records tenths of a mile. Therefore, I don't know how close the stock odometer was to reaching 12.9 miles. However, using the most conservative estimate of 12.80 miles, I performed the following calculations.

12.8 miles minus 12.1 miles = 0.7 miles 'optimistic' on the odometer

(0.7 miles divided by 12.1 miles) x 100 = 6 percent 'optimistic'

Using the same, Garmin GPS receiver for comparison, the stock speedometer is running over 10 percent 'optimistic.'

[SpudRider]

That makes the total at least six; I might get two.

I don't plan to make any money on this venture. As soon as I get a firm price from the vendor, I will post the delivered cost per unit to the United States. At that time I will accept payment via PayPal before I order the units.

After the units arrive, I will determine the domestic shipping cost via first class mail from the U.S. Postal Service. Then I will ship the units out individually as I receive payment via PayPal for the domestic shipping cost. I might add one dollar per unit to help cover my fuel expenses traveling back and forth to the post office. I don't want to lose money on this deal.

[SpudRider]

Good for you, Fish.

[SpudRider]

Of course, if the price isn't significantly more expensive making an individual order, I will let you know. I will only arrange a group buy if the cost per unit is significantly better than ordering the units individually.

[SpudRider]

As for myself, I would rather have speedometer accuracy over odometer accuracy. However, everyone must make his own decision regarding this matter. Of course, one could set the Jaycar Speedo Corrector somewhere in the middle, and he would have a 5 percent 'optimistic' speedometer, and a perfectly accurate odometer.

Of course, I am assuming my measurements are correct. I heartily encourage others to complete the same experiments, and report their results.

[Weldangrind]

Originally Posted by SpudRider

Of course, one could set the Jaycar Speedo Corrector somewhere in the middle, and he would have a 5 percent 'optimistic' speedometer, and a perfectly accurate odometer.

I'm betting that a tire change to a different aspect ratio would result in nearly a 5% difference.

[SpudRider]

Originally Posted by Weldangrind

I'm betting that a tire change to a different aspect ratio would result in nearly a 5% difference.

Indeed, that's why it's nice to be able to calibrate the speedometer/odometer if you change tires, or the tread wears down on knobby tires, et cetera. I am starting to think it might be advantageous to locate the Jaycar Speedo Corrector under the pillion saddle, near the ECU. This area is not only protected from moisture, but it allows easy access to the unit whenever you want to make an adjustment.

Adjusting the Jaycar unit is as simple as turning one, or both of the potentiometers, and you can do that with the screwdriver in the tool kit, which is stored under the pillion saddle. In contrast, adjusting the SpeedoDRD is more involved, and that speedo corrector costs $70.

[oldqwerty]

All electronics will succumb rapidly to getting wet. Waterproofing electronics is very easy. Silicone bathtub caulk does a fine job. Heck, all those billions of old school small block Chevy engines out there have been running since 1954 with the intake manifold ends sealed with gorilla snot of one form or another. Permgasket makes a half dozen products that will work. 3m makes maybe 1.2 billion different products that will work.

[SpudRider]

Originally Posted by oldqwerty

All electronics will succumb rapidly to getting wet. Waterproofing electronics is very easy. Silicone bathtub caulk does a fine job. Heck, all those billions of old school small block Chevy engines out there have been running since 1954 with the intake manifold ends sealed with gorilla snot of one form or another. Permgasket makes a half dozen products that will work. 3m makes maybe 1.2 billion different products that will work.

I really like the Permatex Black RTV; I use it all the time to seal the rocker cover gaskets on my two Hondas.

http://www.walmart.com/ip/Permatex-U...Maker/16777009