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R34 - Switching cluster from non turbo auto --> turbo manual after diff change

tommytomatoes
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GTSBoy Grand Master

GTSBoy

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On the cluster, do not touch the wiring on 30 or 31. They are the output from the cluster to everything else in the car that wants to know vehicle speed.

Connect Jaycar input black wire to the wire coming up from the gearbox to the cluster, which is 19 on the cluster. You need to cut the wire to 19.

Connect the Jaycar red output wire to cluster 19.

Thus, the Jaycar unit is interposed in the line from gearbox speed sensor to the cluster, and adjusts that signal.

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djvoodoo Experienced

djvoodoo

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13 minutes ago, GTSBoy said:

On the cluster, do not touch the wiring on 30 or 31. They are the output from the cluster to everything else in the car that wants to know vehicle speed.

Connect Jaycar input black wire to the wire coming up from the gearbox to the cluster, which is 19 on the cluster. You need to cut the wire to 19.

Connect the Jaycar red output wire to cluster 19.

Thus, the Jaycar unit is interposed in the line from gearbox speed sensor to the cluster, and adjusts that signal.

Yep, ok got it now! Took me a while 😵‍💫

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Kinkstaah Grand Master

Kinkstaah

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DO NOT USE THE JAYCAR MODULE.
IT IS SHIT, UPDATES SLOW AND IS SHIT. I HAVE USED IT. I HAVE AN ALTERNATIVE.

BUY THE DAKOTA DIGITAL ITEM LINKED BELOW INSTEAD.

https://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=1192/mode=prod/prd1192.htm

IT CAN BE FOUND IN PLACES. DO NOT BUY THE JAYCAR ITEM. IF YOU DO, YOU WILL RETURN TO THIS POST AND BUY THE DAKOTA ITEM ANYWAY. THE JAYCAR ITEM IS CHEAP BECAUSE IT IS SHIT.

This sentence is not in bold and in capitals to underline the fact the above formatting is completely intentional.

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djvoodoo Experienced

djvoodoo

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7 hours ago, Kinkstaah said:

DO NOT USE THE JAYCAR MODULE.
IT IS SHIT, UPDATES SLOW AND IS SHIT. I HAVE USED IT. I HAVE AN ALTERNATIVE.

BUY THE DAKOTA DIGITAL ITEM LINKED BELOW INSTEAD.

https://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=1192/mode=prod/prd1192.htm

IT CAN BE FOUND IN PLACES. DO NOT BUY THE JAYCAR ITEM. IF YOU DO, YOU WILL RETURN TO THIS POST AND BUY THE DAKOTA ITEM ANYWAY. THE JAYCAR ITEM IS CHEAP BECAUSE IT IS SHIT.

This sentence is not in bold and in capitals to underline the fact the above formatting is completely intentional.

Noted and taken on board!

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djvoodoo Experienced

djvoodoo

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1 hour ago, joshuaho96 said:

Is there a better way to do this? If people have figured out how to modify the odometer on the cluster module surely it must also be possible to figure out how to recalibrate how it correlates output shaft speed on the transmission to speed/distance.

I've been told that the R33 GTR speedo sensor will fit into the Getrag, but you just need to modify the adaptor plug to suit the 34. But in saying this, i've also been told the speedo is still out by 3-5%

Edited by djvoodoo
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joshuaho96 Veteran

joshuaho96

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1 hour ago, djvoodoo said:

I've been told that the R33 GTR speedo sensor will fit into the Getrag, but you just need to modify the adaptor plug to suit the 34. But in saying this, i've also been told the speedo is still out by 3-5%

I was thinking more about modifying the ROM or circuitry on the gauge cluster instead. 

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GTSBoy Grand Master

GTSBoy

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I'd forgotten that Greg had had a bad time with the Jaycar box - I just presumed that it worked.

4 hours ago, joshuaho96 said:

Is there a better way to do this?

Yes. The answer would be a fairly simple Arduino project. Just need some math to read the frequency of the incoming and generate a new sawtooth wave with the adjusted frequency. Probably wouldn't even have to be that clever to get it done. I imagine that there's lots of example code you could steal, and it wouldn't matter how cludgy or inefficient it was.

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  • 3 months later...
Skylineran21 Newbie

Skylineran21

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On 9/8/2020 at 2:31 PM, tommytomatoes said:

Speedo is now operational. Correct wiring is #19 input and ground out the other wire. I put the ground on the crash bar vertical support to the right of the stereo.

Appreciate the help gtsboy! 

How exactly did you do this? I have a r34 25gt converted to manual. Auto speedometer was working fine. Swapped for a Nismo GTT meter and now speed gauge won’t read. Would you happen to know how I can get the speed gauge to work? 

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tommytomatoes Contributor

tommytomatoes

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On 1/28/2024 at 12:34 PM, Skylineran21 said:

How exactly did you do this? I have a r34 25gt converted to manual. Auto speedometer was working fine. Swapped for a Nismo GTT meter and now speed gauge won’t read. Would you happen to know how I can get the speed gauge to work? 

The mtx/atx pinouts are different for the connector to the cluster. Also your automatic car has a sensor at the diff to read speed while the manual cluster uses the speed sensor on the manual transmission. I bought the mtx speed sensor connector, plugged in it and ran the wires into the car, grounded one out on the crash bar [any ground is good] and the other I put in pinout # 19. It should now work.

 

Edit: you can find the pinout numbers in the R34 workshop manual on page EL19. If you don't have it, shoot me your email and Ill send the manual to you.

Edited by tommytomatoes
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Skylineran21 Newbie

Skylineran21

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On 1/30/2024 at 2:43 PM, tommytomatoes said:

The mtx/atx pinouts are different for the connector to the cluster. Also your automatic car has a sensor at the diff to read speed while the manual cluster uses the speed sensor on the manual transmission. I bought the mtx speed sensor connector, plugged in it and ran the wires into the car, grounded one out on the crash bar [any ground is good] and the other I put in pinout # 19. It should now work.

 

Edit: you can find the pinout numbers in the R34 workshop manual on page EL19. If you don't have it, shoot me your email and Ill send the manual to you.

Thank you soo much!! I did forget to mention that the car was converted to manual before I purchased it. So I’ll take a look at the diff for that extra sensor just in case. Ahhh I see now.  I’ve looked at the manual and found pin 19!  So to be 100% clear, I wire directly to pin 19 and not just tap into the existing wire?  

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tommytomatoes Contributor

tommytomatoes

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47 minutes ago, Skylineran21 said:

Thank you soo much!! I did forget to mention that the car was converted to manual before I purchased it. So I’ll take a look at the diff for that extra sensor just in case. Ahhh I see now.  I’ve looked at the manual and found pin 19!  So to be 100% clear, I wire directly to pin 19 and not just tap into the existing wire?  

Its been 3 years since I did it, cant remember if there was a wire there or not. If there is, snip it from the current harness and run new wire from transmission speed sensor connector to it. Good luck.

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Skylineran21 Newbie

Skylineran21

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1 hour ago, tommytomatoes said:

Its been 3 years since I did it, cant remember if there was a wire there or not. If there is, snip it from the current harness and run new wire from transmission speed sensor connector to it. Good luck.

Thank you!!! I’ll keep you updated on the results! 🙏🏼

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