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Old 01-14-2020, 09:10 AM   #1
Prime240
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Default No speedo after G80 swap in 89 244

Hello turbobricks
Now before going any further: I am aware that the tone ring on a G80 is made for ABS cars and won’t be read as is in my 1989 240 DL.
Now I was thinking, maybe I am being too naïve, that if I swapped also the cover and used a later car cluster it could read the speed signal.
So I took everything out of a 1993 244 but unfortunately the speedometer does not move.
Have I been too naïve to think this could be that easy to fix? is there something else I should’ve looked for or it’s really impossible to have a GE80 correctly read speed in a non-ABS car regardless of what cluster and what cover you use?
Thank you for your time and ideas
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Old 01-14-2020, 09:48 AM   #2
bobxyz
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Did you swap the differential VR sensor too? If so, is the clearance from tip of sensor to the tone ring correct? (I'm thinking it should be 1mm / 0.040", but I haven't had my coffee yet.)
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Old 01-14-2020, 10:10 AM   #3
Prime240
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Quote:
Originally Posted by bobxyz View Post
Did you swap the differential VR sensor too? If so, is the clearance from tip of sensor to the tone ring correct? (I'm thinking it should be 1mm / 0.040", but I haven't had my coffee yet.)
Hi
Yes, we swapped the sensor along with the cover
Did not measure distance from tone ring to sensor... don’t see how I could have
Thx
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Old 01-14-2020, 02:37 PM   #4
dl242gt
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The wiring on the car likes to break right where it goes through the grommet in the trunk. Now that you have been working on it you may have broken a connection.
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Old 01-14-2020, 06:39 PM   #5
Prime240
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Quote:
Originally Posted by dl242gt View Post
The wiring on the car likes to break right where it goes through the grommet in the trunk. Now that you have been working on it you may have broken a connection.
Thats a good idea

In other news today I learned that the cover I took myself off a 1993 244 might not be from that car. The guy that had it just told me today he probably put one from a 940 on it for some reason... good grief... so I guess there is my problem?
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Old 01-14-2020, 07:54 PM   #6
bobxyz
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I haven't personally measured and shimmed a diff VR sensor, but I'd measure depth from edge of hole to a tooth, then measure the sensor mounting flat to tip distance, and subtract to get the clearance. From the pictures, the 48-tooth sensor has 2 parallel pole tips (the metal patches sticking out) that match the tooth-to-tooth spacing.

Note: I think the 3pin connector to the speedo changes between early and late electronic speedos. You'll need to verify this but IIRC
- non-abs speedo goes blue/black/grn-wt, or +12v/gnd/VR
- abs speedo goes blue/grn-wt/black, or +12v/VR/gnd

There should be some small letters on the board, maybe + / G+ / G-, or +12v/VR/gnd. If you have both old and new speedos, you can probably figure it out. You may need to swap grn-wt and black if I'm correct.

Edit: I found my pic of a '91 non-abs speedo board:

Last edited by bobxyz; 01-14-2020 at 08:09 PM..
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Old 01-14-2020, 09:31 PM   #7
James M
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Just cut 3 for every 4 bars off the tone ring, smooth it out so you don't destroy a VSS...
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Old 01-15-2020, 03:57 PM   #8
ZVOLV
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I never got my speedo to work correctly on my non ABS 1990 240 G80 swap. I cut the windows to 12.

I tried the two post pickup- way too fast

I tried the alum cover with original sensor, no dice. No speed.


I tried various combos. I forget exactly what I did. ^^

I think flat sensor, from an alum cover, with an alum cover MAY be the secret.
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