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BMW E30 VSS Sensor
Posted: Sun Apr 23, 2017 4:23 pm
by 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?
Re: BMW E30 VSS Sensor
Posted: Wed Apr 26, 2017 10:16 am
by Schlander
Just a little helper..
Here's a picture of the trigger wheel and the sensor.
Re: BMW E30 VSS Sensor
Posted: Thu Apr 27, 2017 8:32 am
by 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.
Re: BMW E30 VSS Sensor
Posted: Thu Apr 27, 2017 2:06 pm
by 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
Re: BMW E30 VSS Sensor
Posted: Fri Apr 28, 2017 6:52 am
by 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
Re: BMW E30 VSS Sensor
Posted: Wed May 03, 2017 8:28 am
by 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!
Re: BMW E30 VSS Sensor
Posted: Tue Sep 12, 2017 5:26 pm
by 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!
Re: BMW E30 VSS Sensor
Posted: Wed Sep 13, 2017 1:39 pm
by derOJ
what exactly is your problem?
do you want to use the speedsensor from the differential or an ABS sensor?
Re: BMW E30 VSS Sensor
Posted: Wed Sep 13, 2017 1:50 pm
by derOJ
Re: BMW E30 VSS Sensor
Posted: Thu Sep 14, 2017 8:50 am
by 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
Re: BMW E30 VSS Sensor
Posted: Mon Sep 18, 2017 9:23 am
by 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
