Speedo vs HUD - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-30-2002, 05:22 PM   #1
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Default Speedo vs HUD

Ok, what inputs drive the speedo and HUD? Is the speedo mechanical? I haven't ever had my cluster out. Kinda need to know.....I'm wondering if I can damage the analog speedo at excessive speed due to overtravel. I gotta beat Turtle'* 136 when my chip gets here.
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Old 10-30-2002, 05:36 PM   #2
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As far as I know.. it'* electronic. As for peggin the speedo needle... I asked about it earlier and the response I got was that it'* ok... and not as if you'll be driving around at 136+ miles for long anways...
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Old 10-30-2002, 10:03 PM   #3
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Default Re: Speedo vs HUD

Quote:
Originally Posted by willwren
Ok, what inputs drive the speedo and HUD? Is the speedo mechanical? I haven't ever had my cluster out. Kinda need to know.....I'm wondering if I can damage the analog speedo at excessive speed due to overtravel. I gotta beat Turtle'* 136 when my chip gets here.
The PCM provides 4000 pulses per mile to the instrument cluster and the HUD. The instrument panel converts the speed signals to mechanical movement. I don't know if burying the needle will hurt it or not, but I doubt it.
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Old 10-30-2002, 10:40 PM   #4
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how close is everyone'* HUD to their speedo?

mine is pretty close +/- 1 mph
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Old 10-30-2002, 10:51 PM   #5
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Mine is +/- 1mph at 100. Below 50, they're dead on.
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Old 10-31-2002, 11:27 AM   #6
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Mine is wacked !!! At 73 kmh on the HUD.. it'* close to 78 kmh.. and above 110.. it takes a while longer.. the HUD can display it at 112 kmh.. and it'* running 110 on the gauge.. and the HUD can say 118 kmh and the needle will point to 112-113 kmh... it doesn't match up till its either 110 or 120 kmh...
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Old 10-31-2002, 02:03 PM   #7
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My HUD is about 1.5 mph higher than the speedometer.
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Old 11-01-2002, 03:17 AM   #8
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For those of you wondering, unlike many passenger cars (like Hondas, for instance) our speedometers are dead-on accurate, even at triple digits (don't ask me how I found this out :P).

And the HUD should be more accurate than the speedo, seeing as it is taking the direct inputs from the VSS.
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Old 11-01-2002, 11:03 AM   #9
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I guess I'm missing sumthin' or just stupid, whats a HUD?
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Old 11-01-2002, 11:11 AM   #10
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Head up display. Speedo and other stuff projected on the windsheild. 92 and up SSE and SSEi.
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