Diff Swap but speedo not working

[Mohammed_A]

Had the internals of the e36 m3 diff swapped into my e30 casing, only problem is the speedo does not work, keeping in mind that the fins that spin in the diff that pass through the sppedo sensor were also changed to the e36 ones, should i change the sensor to the e36 one as well or would the e30 one work, my speedo was working fine before the diff swap.

[hoyabmw]

I had the same problem with my old diff. No help from me as I never did figure out the problem as I had the ring, and it was turning, and 3 different sensors didn't work.

[Mohammed_A]

I had the same problem with my old diff. No help from me as I never did figure out the problem as I had the ring, and it was turning, and 3 different sensors didn't work.

so what did you do? just replace the diff?

[hoyabmw]

so what did you do? just replace the diff?

Yeah. I lived with it for 4+ years just determining speed based on gear and RPM, then took the 4.10 out and went back to a 3.73. The replacement diff works fine with the sensor off the 4.10. I stuck with it due to the old diff being a Quaiffe, but finally decided that is really not the best setup for autox.

In my diagnosing, I replaced the sensor twice, the wiring into the cabin, pulled the cluster, etc. Finally I think it was that the toothed gear wasn't registering right. Mine was originally built for an M Coupe, so you may be on to something with the toothed gear being different.

FYI, while it's not working, you're also not registering any miles.

[guibo09]

Yeah. I lived with it for 4+ years just determining speed based on gear and RPM, then took the 4.10 out and went back to a 3.73. The replacement diff works fine with the sensor off the 4.10. I stuck with it due to the old diff being a Quaiffe, but finally decided that is really not the best setup for autox.

In my diagnosing, I replaced the sensor twice, the wiring into the cabin, pulled the cluster, etc. Finally I think it was that the toothed gear wasn't registering right. Mine was originally built for an M Coupe, so you may be on to something with the toothed gear being different.

FYI, while it's not working, you're also not registering any miles.

out of curiosity, why do you find the quaiffe not ideal for autox?

[Mohammed_A]

Yeah. I lived with it for 4+ years just determining speed based on gear and RPM, then took the 4.10 out and went back to a 3.73. The replacement diff works fine with the sensor off the 4.10. I stuck with it due to the old diff being a Quaiffe, but finally decided that is really not the best setup for autox.

In my diagnosing, I replaced the sensor twice, the wiring into the cabin, pulled the cluster, etc. Finally I think it was that the toothed gear wasn't registering right. Mine was originally built for an M Coupe, so you may be on to something with the toothed gear being different.

FYI, while it's not working, you're also not registering any miles.

thanks....
my dad has an e36 so im gonna swap the sensor and check, as for the registering of miles, im currently running the motor in so i need to know how many im doing.

Thanks for the input:)

[hoyabmw]

out of curiosity, why do you find the quaiffe not ideal for autox?

The quaiffe goes open when you completely unload one tire, so it's not really useful if you are running BIG tires and can really load the suspension. The clutch type diffs just perform better. It's awesome for track driving though.

[Mohammed_A]

Problem Sorted......:p


Fitted the e36 sensor and the speedo works ....

btw. with the s50 swap, when the speedo does not work then the consumption metre doesnt as well, it just moves from right to left and back again continuosly