- Joined
- Mar 19, 2003
- Location
- Denver, CO
Microsquirt and the LH2.4 VR sensor reading 60-2 crank position sensor
I am trying to do a quick megasquirt install on my 1992 240. I bought a Microsquirt unit, version 3 they call it. It saved me lots of assembly time, and it seems to be a quality piece. But I'm having some trouble getting a clean signal from the crank speed sensor, aka VR sensor on the flywheel.
The car runs, but won't rev past 3000 rpm. At that rpm it loses sync from the sensor and I get ECU resets.
I found this article at DIY Autotune about noise specific to the 60-2.
http://www.diyautotune.com/tech_articles/vrsensor/megasquirt_vr_index.htm
So I added a 10k ohm resistor in line to the VR sensor. With this resistor installed the "rev limit" is now at 1500-2000 rpm range.
The microsquirt unit does not have adjustable potentiometers on the VR filtering circuits. I don't even know what they look like because they are sealed up in that beautiful case. So I'm at a loss here. Do I keep trying different resistor values until it works? Does anyone have a recommended resistor value that does the job?
What exactly am I doing here with the resistor? Is this simply reducing the voltage from the VR sensor across the board, or is there a ow pass/high pass filtering effect happening here because of the inductor and resistor interacting?
=================
Adding my VR sensor wiring
Microsquirt VR1(+) ===> EZK pin 23
Microsquirt VR1(-) ===> EZK pin 10
Microsquirt VR(shield) ===> EZK pin 11
I am trying to do a quick megasquirt install on my 1992 240. I bought a Microsquirt unit, version 3 they call it. It saved me lots of assembly time, and it seems to be a quality piece. But I'm having some trouble getting a clean signal from the crank speed sensor, aka VR sensor on the flywheel.
The car runs, but won't rev past 3000 rpm. At that rpm it loses sync from the sensor and I get ECU resets.
I found this article at DIY Autotune about noise specific to the 60-2.
http://www.diyautotune.com/tech_articles/vrsensor/megasquirt_vr_index.htm
So I added a 10k ohm resistor in line to the VR sensor. With this resistor installed the "rev limit" is now at 1500-2000 rpm range.
The microsquirt unit does not have adjustable potentiometers on the VR filtering circuits. I don't even know what they look like because they are sealed up in that beautiful case. So I'm at a loss here. Do I keep trying different resistor values until it works? Does anyone have a recommended resistor value that does the job?
What exactly am I doing here with the resistor? Is this simply reducing the voltage from the VR sensor across the board, or is there a ow pass/high pass filtering effect happening here because of the inductor and resistor interacting?
=================
Adding my VR sensor wiring
Microsquirt VR1(+) ===> EZK pin 23
Microsquirt VR1(-) ===> EZK pin 10
Microsquirt VR(shield) ===> EZK pin 11
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