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View Poll Results: How far off is your HUD vs your Analog Speedo?
4-6 mph under the analog 0 0%
1-3 mph under the analog 0 0%
dead-on with the analog 3 21.43%
1-3 mph over the analog 8 57.14%
4-6 mph over the analog 3 21.43%
my speedo and HUD are no where's near being close 0 0%
Voters: 14. You may not vote on this poll

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Old 09-26-2004, 09:49 PM   #11
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Quote:
Originally Posted by willwren
I think mine is different than when I got the car, probably due in part to a tire change. Not really sure. I think the analog is a mechanical gear, and the HUD counts pulses?

Funny stuff discussed in the past:
http://www.bonnevilleclub.com/forum/...pic.php?t=1180

Pay particular attention to Amy_Lynn'* comment, and Jstpsntym'* advice
i was under the impression that even though both systems use different wires, they're both coming from the pcm.

in any event, i only know of one vehicle speed sensor on your car you have a nice little toothed gear on your output shaft, which moves through the magnetic field in your speed sensor. in turn, that creates a fun little step type signal, the frequency of which your pcm reads as it'* speed. one speed sensor, to the pcm, to your hud and dash.

if i had to guess, (this is a guess), it'* intentional if it'* not quite lining up. i've heard on many trucks, the speedo is always clocked fast to help truckers stay within the limits of the law unwillingly.

anyhew, it could also be the refresh time of the HUD. i drove a park ave ultra and a GTP just about side by side, and the HUD refresh on the ave was much slower - it took a rolling average over almost two seconds, while the GTP refreshed more frequently.
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Old 09-26-2004, 10:03 PM   #12
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They're driven buy the same sensor in the trans case right abouve the differential. I wonder if swapping sensors would make any difference?
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