BMW E30 VSS Sensor

[derOJ]

Hi.
My E30 has a reed contact in its differential to generate the signal for the speedometer.
It just switch to ground 9 times per wheel revelation.
I connect this signal to EMU with "Hall/Optical" and "Enable 5V Pullup"
Then I do the VSS Output back to the BMW Speedometer.

It works, but I get many "spikes" on my Speedo. It shows e.g. 70km/h then suddenly 130 or else and back to 70km/h.

I think it is because of the bouncing reed contakt.
Is there a chance for a filter to compensate this? Or shall I try to change the sensor to Hall, or VR?

[Schlander]

Just a little helper..

Here's a picture of the trigger wheel and the sensor.

[derOJ]

Nice pics
Thank you.

I will try a simple capacity with 33nF or something.
If that doesn't help, I will try to use ABS signal. Because mine doesn't have an ABS system installed, I can use the wheel sensors without interfere with ABS.

[RHD]

why are you doing it this way??? the e30 has a speed signal from the body harness/cluster to the original ecu so why not just connect that wire to the EMU VSS input

[derOJ]

Because the original Speedo is limitet to 240km/h.
I switched to a speedo with 300km/h. And so I have to adjust the speed signal with EMU

[derOJ]

Now I am using the ABS Sensor and it works great.

Did I mention I like the EMU?
Just switched to VR Sensor, diesabled Pullup, set the frequency divider and scale factor.
Great!

[NeMe$i$]

I have the same Problem,
maybe im not the electrical pro
But i would use se speed signal on my E36, which setup i must use to became a signal!?!

its an E36 from 1997


best ragards an thanks for help!

[derOJ]

what exactly is your problem?

do you want to use the speedsensor from the differential or an ABS sensor?

[derOJ]

maybe this will help you too

http://www.sim-pc.de/bmw-e36-tachosteckerbelegung/

[NeMe$i$]

I Would use the Signal from the dash, also the differential Sensor. I Think The Signal are the Same.

Car has no ASC .

Tim

[derOJ]

no, they are not the same.
the signal from dash is debounced. you should use this, instead of the diff signal.
it should be the black/white wire from the dash harness
in EMU you have to set the input signal to optical/hall sensor and no pullup