Alternative speed sensor

[vstryker]

Well looks like I managed to break my old speed sensor when I carefully pulled it out as I was in the process of removing the engine & 6 speed.

 

Is there an alternative way to get the speedo to work by using some sort of inductor sensor on the front wheels or rear axel? I have a 2005 zetec based S3 Caterham. I'm looking to do this instead of simply replacing the sensor since I've read somewhere you can plug the angle speed sensor port on the caterham 6 speed. I'm annoyed with the 1-2 drops of oil seeping from the old speed sensor so I want to permanently plug it.

 

Also, anyone know where I can get the plugs for the Caterham 6speed/T9 tranny.

 

TIA

[wemtd]

There are vdo speedo sensors that work off a Hall effect or a magnetic pickup from your axle/prop shaft bolts

Some also use a gps based speedo sensor

[slomove]

The standard way of picking up the speed for live axle Birkins is a stock Ford Zetec crank position sensor that is mounted close to the 4 propshaft flange bolt heads near the diff (maybe 60/1000" gap). That works reliably with a normal VDO speedometer. Since it makes 4 pulses per revolution, the speedo must be calibrated accordingly.

[scannon]

Caerbont Calibration.pdf

 

I made a simple bracket to mount a sensor on the two bolts holding the caliper to the upright on the LF wheel.

 

The sensor is:

 

brown wire +Vdc

blue Earth

black signal to speedo

 

automation direct

AM!-AP-3A 12MM pnp 10-30Vdc Inductive Proximity Sensor

 

http://www.automationdirect.com/adc/Shopping/Catalog/Sensors_-z-_Encoders/Inductive_Proximity_Sensors_-z-_Proximity_Switches/12mm_Round_Industrial_Automation/Extended_Sensing_Distance_%2812mm%29/AM1-AP-3A

 

You can find calibration procedures on the Caerbont website if the attachment doesn't work.

 

http://www.caigauge.com/product-instructions

 

Under Speedometers click on "Electronic (2004 to date)

[super7guy]

Can you provide pictures?

 

Is the speedo drive the same for the 5 speed and the 6 speed? is the plug the same size?

 

thanks, Wayne

[vstryker]

upon further inspection, it looks like I broke the wires & the speedo drive itself, the rest of it is still inside the box. I know I can order a new speedo drive but won't know how many teeth until I take it apart. As for the wiring connection, can it be fixed as it snapped off at the plastic portion?

 

I'm assuming the plugs are the same size between the 5 & 6 speed but not sure on the drive gear...

 

Also, is there an option where I keep my stock speedo working if I convert it to one of the above options?

 

http://i25.photobucket.com/albums/c87/vstryker/Cosworth%20Duratec%20Rebuild/20160530_180948_zpsms163n6n.jpg

[papak]

You could go to a GPS driven speedometer. VDO offers several faces and sizes.