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Speedo not working 1990 R31

MattBas1975

By MattBas1975,
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MattBas1975 Apprentice

MattBas1975

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Hi all, thanks for letting me join group. Some help here would he much appreciated. My son bought he's 1st R31 and we have no Speedo working. I have attached Pics if what we discovered yesterday. It's a conversation to manual.

 

Cheers Matt

received_1265258647579530.jpeg

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received_765912838075202.jpeg

received_400953538815954.jpeg

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Duncan Grand Master

Duncan

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Welcome to the forums Matt, and well done to your son for making an excellent choice in 1st car.

I am not familiar with R31 setups, but R32 used a mechanical speedo drive from the gearbox to the dash and I suspect R31 might as well. Is there another connection further back on the gearbox on the passenger side? Of course this may never have been done properly when the manual swap was done.

GTSBoy Grand Master

GTSBoy

Posted
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Here's an RP71C #2 (photo taken from this very site) showing an electronic speed sender.

http://i68.photobucket.com/albums/i30/0t1/more/IMG_0296.jpg

I'm not at all sure what that 3pin connector is all about - unless it is the wiring for the reverse and neutral switches brought together. It's certainly not the usual connector for the speed sensor.

Anyway - I'm pretty sure that the R31a used a mechanical speedo drive, and this gearbox, being an R33 turbo box (the best thing to have, by the way) usually has an electronic speed sender, as in the image above. So - you cannot make it work without building a mechanical speedo drive. You will need the speedo drive from a Navara from the same period to do this. I think you have to use the gear from your electronic drive to get the right ratio (Navara being different). There are howtos on here and elsewhere on the net, although I've never actually seen one as I didn't have to do mine - my bro'-in-law built the drive for me.

MattBas1975 Apprentice

MattBas1975

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  • Author
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On 31/07/2022 at 10:35 AM, Duncan said:

Welcome to the forums Matt, and well done to your son for making an excellent choice in 1st car.

I am not familiar with R31 setups, but R32 used a mechanical speedo drive from the gearbox to the dash and I suspect R31 might as well. Is there another connection further back on the gearbox on the passenger side? Of course this may never have been done properly when the manual swap was done.

 

MattBas1975 Apprentice

MattBas1975

Posted
  • Author
Posted
On 31/07/2022 at 11:19 AM, GTSBoy said:

Here's an RP71C #2 (photo taken from this very site) showing an electronic speed sender.

http://i68.photobucket.com/albums/i30/0t1/more/IMG_0296.jpg

I'm not at all sure what that 3pin connector is all about - unless it is the wiring for the reverse and neutral switches brought together. It's certainly not the usual connector for the speed sensor.

Anyway - I'm pretty sure that the R31a used a mechanical speedo drive, and this gearbox, being an R33 turbo box (the best thing to have, by the way) usually has an electronic speed sender, as in the image above. So - you cannot make it work without building a mechanical speedo drive. You will need the speedo drive from a Navara from the same period to do this. I think you have to use the gear from your electronic drive to get the right ratio (Navara being different). There are howtos on here and elsewhere on the net, although I've never actually seen one as I didn't have to do mine - my bro'-in-law built the drive for me.

Cheers mate. Will check to see if cable is actually in the back of the dash tonight and we'll take it from there. Appreciate your feedback a lot. 

Scottyd 240z Apprentice

Scottyd 240z

Posted
Posted
On 1/8/2022 at 9:02 AM, MattBas1975 said:

Cheers mate. Will check to see if cable is actually in the back of the dash tonight and we'll take it from there. Appreciate your feedback a lot. 

Hi Matt, I have a RP71C#2 gearbox in my car and it is the twin synchro RB20det gearbox from the r32 Skyline, my car uses a mechanical drive speedo which I recently replaced the speedo pinion drive as it disintegrated and jammed up and would not let me select 5th gear. 

 

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