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Old 01-10-2007, 02:37 PM   #1
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Default Calibrating a HUD?

Hey,

My MPH between the speedo and HUD is slightly off. When my speedo says 70MPH, my HUD says 73, etc. Is there a way to calibrate it?
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Old 01-10-2007, 02:40 PM   #2
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Not to my knowledge. I suffer from about a 3-5mph difference.

The problem appears to be the gauge in the dash, being mechanical driven by the same input wire as the HUD.
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Old 01-10-2007, 03:03 PM   #3
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Roll down your window (you'll need long arms or a helper for this).

Start driving. At the exact speed the hud and speedo match, reach out the window in front of the car, grab the magic hud numbers and hold them. Press the accellerator and take it up to 100mph on the speedo, then let go of the HUD numbers.



Kidding of course. Your HUD is accurate. The speedo has some mechanical/electrical loss.
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Old 01-10-2007, 10:23 PM   #4
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ya know what'* wild??

I'm on my third Bonnie with a HUD...... well, kind of.

#1- 98 SSEi........ hud was off the almost 5 mph when running 70+
#2- 97 SSE......... hud was off aprx 3-4 mph when running 70+
#3- 97 SE(pulled hud from the above SSE)- DEAD ON!!! Never off more than 1 MPH through 85 mph.

So what does this mean? Maybe it'* tied back to the SE dash vs. the SSE? Or maybe it'* Pat'* wiring skills.
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Old 01-10-2007, 10:30 PM   #5
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Quote:
Originally Posted by Ramsrule
ya know what'* wild??

I'm on my third Bonnie with a HUD...... well, kind of.

#1- 98 SSEi........ hud was off the almost 5 mph when running 70+
#2- 97 SSE......... hud was off aprx 3-4 mph when running 70+
#3- 97 SE(pulled hud from the above SSE)- DEAD ON!!! Never off more than 1 MPH through 85 mph.

So what does this mean? Maybe it'* tied back to the SE dash vs. the SSE? Or maybe it'* Pat'* wiring skills.
im within 1 mph as well.... on my SLE dash and HUD
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Old 01-10-2007, 11:39 PM   #6
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mines only off by 1/2mph, its nice
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Old 01-11-2007, 12:26 AM   #7
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mione was off about 3-5 mph always went by the hud
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Old 01-11-2007, 07:49 AM   #8
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That'* an odd correlation Ramsrule.. I like it though.

Only speculation is they made the SE cluster more accurate because you'd actually be looking at it.

Both the cars I've had were 3-5 off.
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Old 01-11-2007, 09:10 AM   #9
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Mine is withing 1 or so at all times. Some are better than others. It'* not the HUD. The HUD is reading exactly what the VSS is telling it. Some SPEEDOMETERS are slower than the indicated speed.

The SPEEDO is the issue with the inaccuracy. Anyone with a GPS can show you that. My GPS has always matched my scantool and HUD, with the speedo lagging.
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Old 01-11-2007, 10:05 AM   #10
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Right WillWren... I figure the speedo'* that suffer whiplash more often are off by more.
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