speedo

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snowy
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speedo

Postby snowy » Sun May 28, 2017 5:36 pm

Hi, a poser for all you mathematically inclined learned gents ( and ladies) out there.
I have now in my possession a K100 derived trike running a Ford ( spit spit) sierra diff, 3.62 ratio on 17" wheels.
now I am showing 62mph for 5k revs on the standard speedo, not overly worried about the top speed but I am about the 30 and 40 mph limits.
So the question, ( who said at last) by how much is the speedo + or - on the shown speed to actual speed.
over to you gents
regards
Snowy

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raesewell
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Re: speedo

Postby raesewell » Sun May 28, 2017 6:16 pm

Check it against a Sat Nav and if you need to, get a speedo healer.

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snowy
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Re: speedo

Postby snowy » Sun May 28, 2017 7:15 pm

Hi Rasewell, did that with the last trike, a yam 1100xvs, £80'squids worth, the trike has a 4 x pole reluctor fitted to the N/S drive shaft using the original pick up, would be ok in a straight line, both wheels at the same speed but cornering would bring in small error, I would like to fit something to the front wheel and still use the original speedo ( if at all possible).
Has anybody done this to any bike, the idea is not specific to the K, seen some specials for sale with digital speedo's etc
Any info would be much appriciated
cheers
snowy

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george baker
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Re: speedo

Postby george baker » Mon May 29, 2017 12:17 pm

Hi
iirc inside the speedo pod there is a calibration adjuster

I dont know how the speedo works but suspect a Frequency to Voltage converter. Based on pulses from the pick up in the bevel box being converted by the electronics to a voltage for display on the speedo. We would need to know how the speedo works, if it does as I suspect then the display is a voltmeter which could be driven by some custom electronics, Pi, PIC, Arduino etc.



1 You could use a gps to get the actual speed as a temporary measure.

2 Then you could make a sticky overlay to allow you to use the original speedo, again as a temporary measure to replace the gps.

3 Dismantle the speedo and try the adjuster to see if you can get the speedo to work with the standard pick up



4 Much more complex, and you would need to discover how the original speedo works but if you can workout how many pulses you need build a ring (like the abs one) to generate the pulses. You could use slots with an opto pick up, opto reflective pick up, magnet/ relay pick up

George
Member 21, R100R, K75 and a Hyosung 250 FOR SALE

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george baker
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Re: speedo

Postby george baker » Mon May 29, 2017 12:47 pm

Hi
http://www.ibmwr.org/ktech/speedo-repair2.shtml says
1 a current proportional to freq. for the meter (speedometer) -- bugger, current generation harder than voltage generation
2 speedo inductive transmitter located on the top of the final drive -- bugger, I was hoping for a voltage pulse

I will keep looking

George
Member 21, R100R, K75 and a Hyosung 250 FOR SALE

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george baker
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Re: speedo

Postby george baker » Mon May 29, 2017 12:58 pm

Hi
http://www.motobrick.com/index.php?topic=599.0
calibration, says 60Hz pickup from the soldering iron, remember UK is 50 Hz

A link to a calibration program is at http://www.k100-forum.com/t2038-karamba ... m-tutorial

George
Member 21, R100R, K75 and a Hyosung 250 FOR SALE

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snowy
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Re: speedo

Postby snowy » Mon May 29, 2017 4:01 pm

Hi George and others
Many thanks for the info, just what I wanted so I will get to grips with it later today.
cheers
Snowy

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george baker
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Re: speedo

Postby george baker » Mon May 29, 2017 5:39 pm

Hi
I found this information as well
The older models have squared connection on the back.
New models >1989 have round connection.

George
Member 21, R100R, K75 and a Hyosung 250 FOR SALE

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snowy
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Re: speedo

Postby snowy » Tue May 30, 2017 6:31 pm

Hi All
Ok so what I have done and yet to test, is to alter the preset pot inside of the speedo, tomorrow looks fine so I may well try it.
thanks once again
Snowy

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george baker
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Re: speedo

Postby george baker » Fri May 04, 2018 4:10 pm

Hi Snowy
update?

George
Member 21, R100R, K75 and a Hyosung 250 FOR SALE

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Re: speedo

Postby PhilO » Mon May 07, 2018 12:27 am

Ride past one of those speed awareness signs that shows your speed. After a few ride byes you will be able to put some tipex dots on the speedo face at cruicial speeds. i.e 20,30,40, 50,60 and 70 mph. Well it is a cheap solution if you can get away with it.

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snowy
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Re: speedo

Postby snowy » Thu Jul 19, 2018 11:02 pm

sorry for late reply, been in and out of hospital, however I did take it for a test ride, 4750 rpm or as near as damit gives me 70mph ( that's just to stay in front of the juggernauts we have on the roads now ), the engine sounds like its screaming but as it can go to 9k rpm I have been told that is ok, I think that a higher diff ratio will give me better fuel economy as the revs wont be so high, I may have to peddle away from the lights tho'!
will investigate further. cheers all.

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snowy
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Re: speedo

Postby snowy » Thu Jul 19, 2018 11:02 pm

sorry for late reply, been in and out of hospital, however I did take it for a test ride, 4750 rpm or as near as damit gives me 70mph ( that's just to stay in front of the juggernauts we have on the roads now ), the engine sounds like its screaming but as it can go to 9k rpm I have been told that is ok, I think that a higher diff ratio will give me better fuel economy as the revs wont be so high, I may have to peddle away from the lights tho'!
will investigate further. cheers all.

Pannier Down
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Re: speedo

Postby Pannier Down » Sat Jul 21, 2018 10:56 am

sorry for late reply, been in and out of hospital, however I did take it for a test ride, 4750 rpm or as near as damit gives me 70mph ( that's just to stay in front of the juggernauts we have on the roads now ), the engine sounds like its screaming but as it can go to 9k rpm I have been told that is ok, I think that a higher diff ratio will give me better fuel economy as the revs wont be so high, I may have to peddle away from the lights tho'!
will investigate further. cheers all.
K100LT sold
K1100LT sold
K1100LT sold
K1100LT bought for brother
K1100LT broken for parts
K1100LT sold
K1100LT sold
K1100LT Bought from brother, in service

spot the pattern,
Mike

Pannier Down
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Posts: 54
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Location: Oxford

Re: speedo

Postby Pannier Down » Sat Jul 21, 2018 10:59 am

The bit that's missing, don't worry about the engine screaming. All of mine sound like they were about to explode at 60, yet are smooth as silk at 80+. Just K bike trait.
K100LT sold
K1100LT sold
K1100LT sold
K1100LT bought for brother
K1100LT broken for parts
K1100LT sold
K1100LT sold
K1100LT Bought from brother, in service

spot the pattern,
Mike


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