Weird speed alert problem

[tallman5353]

Hi everyone,

I am experiencing this weird issue with the speed alert in my VYII Calais.
The speed alarm seems to come on at 63 or 64km/h when i have it set for 65. I activated the digital speedo in the police mode to confirm this.
The speedo needle also shows it is at/around 63/64km/h, so i don't think the speedo is out.
It also happens for all other speed alert settings too, ie: 85/105/115 etc.

Anyone have this issue? Kinda strange. A bit annoying too.

Cheers

 

[Nut Kracker]

Your speedo might be out a bit.
Check this out......https://forums.justcommodores.com.au/threads/vy-vz-everything-know-about-changing-clusters.203722

There is a section on recalibrating the speedo.
Just scroll down a bit and you will find it.

 

[tallman5353]

Hmm, i don't think that is the issue, when i cycle through police mode, the needle stays on 100 fine. I tried GPS'ing the speed and it is like most other cars, the indicated speed is a couple km'h over the true reading (normal).
I'm out of ideas, would a speed calibration via a tech2 fix it?

 

[Tasmaniak]

tallman, I think you'll find you are not alone and damn near every commodore out there does it. We just learn to deal with it.... Mines set for 150... So I rarely see it.

 

[tallman5353]

I still think there must be a way. All the dials work as they should, I just don't see why the speed alert is cutting in so early, I've never had this problem on any other car, and that includes a vt commy and a wh statesman.
What gives?

 

[Tasmaniak]

They use two different speed measuring systems.... it's not your speed alert thats out. Its your dash. You said that the dash reads a couple of k higher when verified with GPS? So if your doing 65 by the dash then the GPS will say 63~ correct? Which is the point that the speed alert kicks in.

 

[tallman5353]

No, it is the other way around, it is like most cars where the dash reads a higher speed than the true speed.

 

[tallman5353]

Actually wait, yea you were right.
How come on other cars the speed alert doesnt kick in early then? Is the analog and digital speed readout wrong?

 

[tallman5353]

Last time i tried the gps, it was dead on with what i was seeing on the dash. But the speed alert was still kicking in a 63/4 km/h
Will have to test again.

 

[Tasmaniak]

potentially... again, it's not uncommon. Especially if your speedo has been recalibrated by physically moving the dials, this obviously won't recalibrate the digital readouts. If it was calibrated with a different tyre size then what it has now... that'll throw it out again.