IVA passed

**Cadami** · 29-10-2014, 14:26

I originally used the standard sensor in the 164 box connected to a GTV electronic speedo. This was via a calibration control box to enable the speed to be calibrated. Worked fine and was 100% accurate.

**hollytree** · 29-10-2014, 20:35

Originally Posted by Cadami

I originally used the standard sensor in the 164 box connected to a GTV electronic speedo. This was via a calibration control box to enable the speed to be calibrated. Worked fine and was 100% accurate.

The vdo speedo has a calibration function.
I just want to know how to check if the alfa sensor is working, should I buy a new one, and if they can be connnected.
Is the alfa inductive or hall effect. It changes the connections on the speedo.

Regards
Steve

**Cadami** · 29-10-2014, 22:33

Steve, I'd assume the box sensor works for starters as they're reliable but you could buy a new one. I'm unsure of the sensor type. You've obviously switched the sensor options on the speedo without any success? It maybe outside the speedo tolerances!
I'd reposition the VDO sensor to a box mount point to pick up the shaft input........ I've used that config for my SPA digital speedo and it works fine.

**mel lewis** · 29-10-2014, 22:48

Just a quick one Steve, check all the nuts are in the same posistion as they pass the sensor, either all flats of the nuts or all points ..

mel

PS Well done young man.....looking forward to seeing it next year at the Kit Car Show or Silverstone...

**turbonutter** · 30-10-2014, 09:31

As above, 1mm alloy bracket is too thin, either a 2 or 3mm steel/stainless bracket mounted to the gearbox is the best way to mount the sensor.

**strat24v** · 30-10-2014, 10:10

Adding to Mels post, there needs to be an equal gap between the sensor and each of the targets it's pointed at, if the gaps are unequal, you will get a poor signal. Not sure on the recommended gap but on an abs sensor I checked, the gap was 0.3mm. Pointing at the nut ends, you may still get a poor signal, is be inclined to point at the cap head end.

**hollytree** · 13-12-2014, 13:57

Bracket arrived from Craig and very nice it is too.
I put 2 washers between the bracket and the gearbox so that the sender was not overhanging the flange at all.
I put a rivnut in for a captive earth connection.
Adjusted the clearance to about 1.5mm and perfect speedo readings. Checked with road angel in car.
Now to rebook test for last iva point.