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Alternate VSS input issue

Posted: Wed Jul 22, 2026 1:41 pm
by fucatypr
I have entered the correct gearing for this car (BMW). It will display the speed from the alternate speed input but launch control will not disengages and I have no VTEC

Re: Alternate VSS input issue

Posted: Wed Jul 22, 2026 2:07 pm
by Spunkster
What is the serial number that is on the K-Pro board inside the ECU?

How do you have the VSS Signal connected to the ECU?

Re: Alternate VSS input issue

Posted: Thu Jul 23, 2026 7:29 am
by fucatypr
56962 purchased from Humble Performance

I'm sending the signal through a Dakota Digital SGI-100BT

Re: Alternate VSS input issue

Posted: Thu Jul 23, 2026 8:59 am
by Spunkster
But how is it connected to the ECU?

Re: Alternate VSS input issue

Posted: Thu Jul 23, 2026 12:02 pm
by fucatypr
Into the alternate VSS input

Re: Alternate VSS input issue

Posted: Thu Jul 23, 2026 12:31 pm
by Spunkster
There is no reading of the VSS in the datalog you have posted.

Re: Alternate VSS input issue

Posted: Thu Jul 23, 2026 12:53 pm
by fucatypr
It shows up under vss input for me

Re: Alternate VSS input issue

Posted: Thu Jul 23, 2026 2:33 pm
by Spunkster
The datalog you have posted does not show any VSS activity. Datalog again and post the datalog and the calibration it was made with.

Re: Alternate VSS input issue

Posted: Thu Jul 23, 2026 4:13 pm
by fucatypr
That's picture is from the datalog I posted. It says 0mph on vss but it shows up under vss input just like in the picture.

Re: Alternate VSS input issue

Posted: Thu Jul 23, 2026 4:45 pm
by Spunkster
If there is no vss showing in the actual datalog and you are having issues with the VTEC and launch control, then the ECU is not seeing the vss signal.

Re: Alternate VSS input issue

Posted: Fri Jul 24, 2026 9:26 am
by fucatypr
Why is it showing up under vss input then?

Re: Alternate VSS input issue

Posted: Fri Jul 24, 2026 10:20 am
by Spunkster
It's not in the datalog you have posted.

Re: Alternate VSS input issue

Posted: Fri Jul 24, 2026 10:43 am
by fucatypr
Can you explain what this is?

Re: Alternate VSS input issue

Posted: Fri Jul 24, 2026 12:17 pm
by fucatypr
Sorry, I tried to attach a picture. Can you explain why I can see a VSS input like in the picture I posted. The MPH is even correct

Re: Alternate VSS input issue

Posted: Fri Jul 24, 2026 12:32 pm
by Spunkster
I cannot, as you are not getting a vss signal in the actual datalog, so the ECU cannot see this signal.