Speedo sensor

[oze30]

Does anyone know how many pulses per mile the e30 speed sensor is?

[cros]

At source, it's 9 pulses per wheel rev. Exact pulses per mile is dependent on wheel size, tyre pressure, tyre tread etc.

But, at the sink, the small print on the speedo says how many it expects to see per mile ('K=xxxx'):

http://www.e30zone.net/modules.php?name ... pic&t=2549

[oze30]

stupid restricted access BS.. Can you tell me what the heading of that topic is please?

[oze30]

and on the speedo wires, what are the low and hi side wire's colours?

[E30Mark]

cros's thread is named Speedo/tacho error & calibration. It's a great read!

oze30 What you logged in through, e30zone.net or .co.uk???? use the .net site and you should be able to link to cros's post.

[oze30]

.net and it still won't let me in. It's not just this comp. it's usually whenever i try to click a link inside a topic. recent or old. doesn't matter!
Cool.. I'll have a squiz at his thread.

[E30Mark]

Hmm sorry about the links not working, what happens if you copy & paste the link into a new tab / window?

Anyway, From speed sensor the brown wire goes to ground, and the brown/red goes to the speed input (Via white connector on back of cluster, pin B12)

[cros]

cros's thread is named Speedo/tacho error & calibration. It's a great read!

oze30 What you logged in through, e30zone.net or .co.uk???? use the .net site and you should be able to link to cros's post.

Thanks!

oze30, you might be logged onto http://e30zone.net but the link is to http://www.e30zone.net. It's always an issue with cross linking...

[cros]

and on the speedo wires, what are the low and hi side wire's colours?

From memory the speedo sender just shorts the two wires together. The speedo itself floats a small voltage on one wire, which is pulled to ground by the sender causing a current pulse that gets detected and processed.