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Weird speed alert problem

tallman5353

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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
 

tallman5353

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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

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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

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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

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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

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

tallman5353

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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

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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

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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.
 
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