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> Electronic Speedo sender, My solution
Wasa914
post Oct 20 2003, 11:49 PM
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I'm a newbie to contribute but I have received a bunch of information from this board in the past which I am very grateful. Just wanted to share what I learned.

I am using a VDO electronic speedometer and have seen alot of innovative ways to send the electronic signal via the 901 trans. My solution is to cut off the slotted key end of the speedometer cable that fits the angled trans cable driver. Drilled out the cable hole and sodder in a shortened square key drive that is in the standard GM VDO sender. I had a machinist do this and make a bushing that will center the slotted cable end in the GM sender. The GM sender has a threaded nut that will fit the 901 angled cable driver which is amazing because I thought it wasn't meteric. Hopefully this picture will appear.

(IMG:http://www.914world.com/bbs2/uploads/post-2-1066763782.jpg)

Philip
'73 914 still in transformation
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914Timo
post Oct 21 2003, 12:18 AM
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Great info. Many thanks.
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kafermeister
post Oct 21 2003, 05:40 AM
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Did you make the adapter piece in the middle?
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JFJ914
post Oct 21 2003, 09:59 AM
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What happened to the picture? All I get is an X.
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Wasa914
post Oct 21 2003, 10:15 AM
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Sorry about the picture. This digital thing is new to me. I'll try to reformat it.

The middle piece is the end of the speedometer cable attached to the square key that comes with the GM sender.

Philip
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Wasa914
post Oct 21 2003, 12:57 PM
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This is my try at reformatting the picture.
\
Philip
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Wasa914
post Oct 21 2003, 12:58 PM
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I'll have to start a new topic and post it.

Philip
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seanery
post Oct 21 2003, 01:16 PM
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here it is.


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SirAndy
post Oct 21 2003, 01:27 PM
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that's schweet! (IMG:style_emoticons/default/wub.gif)

i already have the elec. speedo (actually my 944 speedo is both!), that seems like a good/easy solution.
how do i adjust a elec. speedo for different tire sizes?

Andy
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ss6
post Oct 21 2003, 02:35 PM
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Search the Pelican 911 board for "speedo" and / or "calibration", plenty of how-to's there.
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Rusty
post Oct 21 2003, 02:38 PM
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Is the signal for an electronic speedo sent via wire or some type of wireless comm?

If it's wire - what's the overall benefit for our cars? After all, we still have an ugly cable beneath, just waiting to be cut by debris, burnt by exhaust, etc.

Curious,
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SirAndy
post Oct 21 2003, 02:55 PM
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QUOTE(Lawrence @ Oct 21 2003, 01:38 PM)
If it's wire - what's the overall benefit for our cars? After all, we still have an ugly cable beneath, just waiting to be cut by debris, burnt by exhaust, etc.

less rotating mass (IMG:style_emoticons/default/laugh.gif)
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sleepdoc
post Oct 21 2003, 04:12 PM
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Hi nice tinker!

Please tell us a bit more about the centering bushing. A pic would be great.

And do I understand correctly that the smaller square drive key part came with the sender part?

thanks Mark
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sleepdoc
post Oct 21 2003, 04:22 PM
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Hi,

One more question.

The GM sender is a 16 pulse per revolution.
This recent post

http://www.914world.com/bbs2/index.php?act...=5400&hl=speedo

suggests that the 911 VDO speedo wants 8 pulses. Are you using a programable speedo? or is this setup working with a 911 speedo correctly?

thanks Mark
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Wasa914
post Oct 21 2003, 11:31 PM
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The bushing is a hard plastic. It not only centers the slotted key, it also seals between the sender and angled cable drive. The small square key came with the sender and was almost cut in half, then solder to the cable end. The long axis play is not limited, there is 2 to 3 mm of play. I will try to enclose a picture.


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Wasa914
post Oct 21 2003, 11:47 PM
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I forgot. The sender is for a programable VDO speedometer and not for a 911. Hopefully this is a better picture.


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sechszylinder
post Oct 22 2003, 02:01 AM
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hi Philip,

this is a great setup, but I have a question concerning the sender: Is this part made by VDO or GM ?
(IMG:style_emoticons/default/confused24.gif)

Benno
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Wasa914
post Oct 22 2003, 07:58 AM
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Benno,

The sender is made by VDO and made to fit all GM trans. In the first posted picture, the blue box has the part number on it.

Philip
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914Timo
post Oct 29 2003, 02:37 AM
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Nobody seem to answer to the sleepdoc´s question. If this GM sender gives 16 pulse per revolution, but
the 911 VDO speedo needs only 8 pulses per revolution, doesnt the speedo show double the speed ??

Could somebody confirm this sender really works with 911 speedo ?? I mean, is there anybody who have this combo in his/her car ???

I just would like to know this for sure before I go and by one.
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sechszylinder
post Oct 29 2003, 02:50 AM
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hi timo,

I guess that it will double the readout, if you double the pulse count.
Philip is using the programmable VDO speedo which needs 16 pulse per revolution.

To half the pulse rate is pretty easy using a small electronic circuit.

benno
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