Speedometer settings

[928sg]

Link Thunder with GM VSS set up as D1.   The VSS is in a C5 Corvette diff which should generate 17 pulses per revolution.  When I set up a digital gauge for D1 it shows 220kph when I'm going  around 40mph.

Attached is a screenshot for the D1 settings.

 

I also have the speedometer set up as an output, and the sweep goes to about 50mph so I know it's connected and I've attached the setting for it as well

 

I'm not getting any speedometer readings while driving.

 

Any ideas?

 

 

I also have this configuration that I found but I have not changed any settings from default.   I'm assuming I should set the driven wheel source to the D1 input of LR Wheel.  Is this correct?

[Vaughan]

Adjust your calibration number, a value of 800 should be close based on some quick maths. Note DI 1 maxes out at about 500Hz, if you want to feed it higher frequencies use one of DI 11-16.

For the speedo output the max frequency is set to 10Hz which will need to be much higher if 100Hz hits 50mph.

[928sg]

so based on the calibration number the basic math breaks down to this.

Rear tire has 483.61 revoltions per km, which breaks down to 48.361 revolutions per 100 meters. multiply this times 17 pulses per revolution and that number should be 822.137

So does that mean I need change the input to anther DI?    

Speedometer goes to 180mph but the car has had multiple 200mph gps verified runs already so 380Hz should get close to the limits of the gauge.

I did change the max frequency to 100 at one point but still never got any speedometer output.

[Vaughan]

7 minutes ago, 928sg said:

So does that mean I need change the input to anther DI?    

 

822 pulses per 100m would mean 500Hz frequency would be reached at just under 220kph or about 135mph, if you want to read much faster than this then you will most likely need to change, that being said it may read a little higher than 500Hz so might require testing if you need to know for sure if it will work at higher speeds.

[928sg]

Speedometer is working.   I changed the following

I set the DI #1  calibration to 822

I set the Speed Source Driven Wheel Speed source to LR to match the setting for DI #1

I set the Speed Source  Acceleration source to LR to match the setting for DI #1

At this point Speedo was working but at 30MPH I was showing 120 on the speedo so on the Speedo Output I changed the multiplier from 1.00 to .25 which got me very close and I finally got the multiplier set @ .24