Need Advise On Speed Sensors

[jzs31man]

Hi, I've got a r31 with a z31 gearbox in it (the big daddy) it has a cable driven speed sender

and I need to run an Hall effect sensor, i got one from a r33 (I was told it came from a 33

to replace the cable driven one, now the body's are the same but the r33 sender cog is bigger

then the z31 sender cog and the cogs are different so can't just swap around, I'm also running

4:11 diff ratio what cog do I need or what sensor do not need and are there different cogs for different

diff ratios, any help would be much appreciated thanks

[GTSBoy]

I can't help with the specifics of the Z31 box, but the related transplant is R33 box into R32. You use the Navara speedo mod to make the sender for that transplant. That mod is actually to provide a cable drive out of the R33 box (hence the Navara sender), so it is kind of the opposite of what you're asking for. I mention it because if you google around on the subject you might find info about the various cogs you're asking about in various people's publications on the topic.

[jzs31man]

Thanks for that and yeah it's the opposite, It's so I can run the launch control on the vipec and I need it pretty accurate and easy

[GTSBoy]

You are aware that the normal cable drive Nissan speedo heads output the sort of signal you (probably) need to the ECU anyway?

[jzs31man]

Yeah all good mate I've found the s13 red cog will fit and b the right gear no for the 4:11 diff and I'm not running a speedo as race car so only need output from sender to Ecu