Speedo Sensor

Simon 1 Apr 2007, 8:35am

I've got to the stage now where I need to complete the wiring for the dashboard and particularly the speedometer. Although I've got a magnetic sensor kit that came with the (CAI instruments) speedo I was wondering wether you can use the toothed wheel and ABS sensor from the disc brake Sierra axle?

I'm thinking that this will be a much better method (assuming it will work) as there are alot more 'teeth/rev' than the magnetic sensor (ie more accurate) and will save me having to make up all the various brackets etc.

I've tried contacting CAI gauges about this but not got a reply. Does anyone else have any experience or thoughts on this?

Thanks. Simon

http://www.flickr.com/photos/marlin_bmw_cabrio

PJC 3 Apr 2007, 6:17pm

Simon,

I'm not that far in the build, but you're only more accurate in the range that you need to reed precisely within the one revolution.

I guess that I can keep up speed by foot in that range!
Because up from 5 mile/hr as soon as the needle comes up you only need 1 signal/revolution to have an accurate measurement.

Every change in speed is readed accurate as soon as you have the second measurement within a time-interval.
I compare it to the speedsensor that is on my bycicle.
Brake hard and within a second my speed is zero.
So no need for more teeth at all.

Peter-Jan