Speedometer signal RCR with G 96

[Havard Stokkeland]

Helping a friend building a RCR with Porsche (getrage) g96.trans. Where do you get the speedometer signal from?
Best regards Håvard

 

[Devin]

My speedometer came with a magnetic pickup sensor that can be positioned at the driveshaft flange (per the instructions) but have yet to install it and drive the car.

 

[Ian Anderson]

It depends……
Some systems need the sensor placed near the CV bolt heads and it counts those and converts into pulses for the speedometer to indicate.

Others require magnets to be installed and the sensor placed near then in order to pick up the signal and make the speedometer indicate.

First you need to figure what you have and then make a bracket to locate the sensor.

I had a magnet type and fitted the magnets to the CV….problem was when the CV failed as boot tore I needed to find magnets etc again….so fit on a “non replacing” part

Ian

 

[Walter]

Helping a friend building a RCR with Porsche (getrage) g96.trans. Where do you get the speedometer signal from?
Best regards Håvard

I use the half-shaft bolts at the transaxle. My magnetic sensor (I use the one for the Lucas speedo and the RCR 8-pulse speedo) sits in a home-made L-shaped plate. See: https://www.gt40s.com/attachments/swaybar1-jpg.138693/
Originally set up (by the original owner) used holes drilled in the right rear brake disc - which did not work! I suppose the signal was too weak. Moreover, the discs get very hot and electro-magnetic devices do not like heat ;-)

Note that the tip of the sensor should be quite close to the bolt head (~ 2 mm). The Lucas sensor has a diode which blinks upon operation which is handy when testing the system.

 

[Michael]

I use the half-shaft bolts at the transaxle. My magnetic sensor (I use the one for the Lucas speedo and the RCR 8-pulse speedo) sits in a home-made L-shaped plate. See: https://www.gt40s.com/attachments/swaybar1-jpg.138693/
Originally set up (by the original owner) used holes drilled in the right rear brake disc - which did not work! I suppose the signal was too weak. Moreover, the discs get very hot and electro-magnetic devices do not like heat ;-)

Note that the tip of the sensor should be quite close to the bolt head (~ 2 mm). The Lucas sensor has a diode which blinks upon operation which is handy when testing the system.

That’s how my car was set up, also by the original owner, with dimples drilled into the left rear rotor, but in my case it does function. However, my 8 switch Speedo is at the extreme limit of calibration, with all 8 switches set to the off position.