Speedometer discrepancy

[MICRider]

Originally Posted by SpudRider

The company 12 O'clock Labs sells a unit called the SpeedoDRD.

http://shop.12oclocklabs.com/index.p...&product_id=59

That is a really slick little unit! A great idea as well since almost all motorcycles have overly optimistic speedometers... Lol, they should sell them in bulk packs!

[SpudRider]

I agree, it's a great little unit, but it certainly is expensive. I bet they can manufacture that item for $10.

[MICRider]

Yup, doesn't really look like there's much to it does there? They make big money on specialty items!

[SpudRider]

I've been looking for a better deal than $70, but I don't think I will find one. At this price, I am inclined to keep my current practice. I multiply the speedometer reading by 0.10, and subtract the product.

However, it is very nice you can reprogram the unit any time you like to reflect a difference in tire size, tread depth, et cetera.

[Weldangrind]

I can't help but think that the answer lies in tapping into the Siemens CPU. I'm betting that a connector and some laptop software will do the trick.

I once used a programmer to correct the speedometer in a buddy's '98 Chev Astro van; the process took a long time, but it was very easy. He had new gears installed for towing, so the electronic speedometer needed to be adjusted to compensate.

[Mudflap]

Some electronic speedos can be recalibrated simply by putting them in set-up mode and punching in the correct wheel diameter. May take a 16 year old to figure out how to do it though. Could be as simple as holding down both buttons while turning the key on, but probably not.

Originally Posted by Weldangrind

I can't help but think that the answer lies in tapping into the Siemens CPU. I'm betting that a connector and some laptop software will do the trick.

I once used a programmer to correct the speedometer in a buddy's '98 Chev Astro van; the process took a long time, but it was very easy. He had new gears installed for towing, so the electronic speedometer needed to be adjusted to compensate.

[Weldangrind]

Maybe one of the RX3 owners would care to email Siemens and ask. Perhaps they'll respond.

[SpudRider]

Originally Posted by Weldangrind

Maybe one of the RX3 owners would care to email Siemens and ask. Perhaps they'll respond.

I will contact them by telephone on Monday, and see if they can refer me to someone who can help.

[fishman10]

well if someone gets one a speedo fixer units ,,does theirs an it works,,i would pay half ,, get it sent to me, then send it back,,,share it twice ,,an its free for the original purchaser.

[SpudRider]

Originally Posted by fishman10

well if someone gets one a speedo fixer units ,,does theirs an it works,,i would pay half ,, get it sent to me, then send it back,,,share it twice ,,an its free for the original purchaser.

The SpeedoDRD does not reprogram the Siemens microprocessor. This unit merely modifies the input sent from the magnetic pickup to the speedometer. Therefore, it must remain in place.

[SpudRider]

I couldn't contact Siemens by telephone today. I guess they are in an eastern time zone, and they were closed when I called. I will try calling them again, tomorrow. In the meanwhile, I sent them an email. However, I am pessimistic they will be either willing, or able, to tell us how to reprogram the Siemens speedometer for better accuracy.

[SpudRider]

The SpeedoDRD will certainly work if we install it between the magnetic pickup line and the speedometer. The SpeedoDRD will plug into the connector behind the headlight, and under the dashboard itself.

[Weldangrind]

Originally Posted by SpudRider

I couldn't contact Siemens by telephone today. I guess they are in an eastern time zone, and they were closed when I called. I will try calling them again, tomorrow. In the meanwhile, I sent them an email. However, I am pessimistic they will be either willing, or able, to tell us how to reprogram the Siemens speedometer for better accuracy.

There's always hope. As well, I'm confident that the group here will figure it out eventually.

[SpudRider]

I was pleasantly surprised, but I actually received a quick response from Siemens regarding the RX3 digital speedometer. After exchanging several emails, I received this final reply.

Unfortunate [sic], we do not have any documentation on that speedometer, you will have to go to the OEM for info.

[Weldangrind]

Interesting. Does that mean the speedometer unit is not connected to the Siemens CPU?