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Late model C4 speedometer

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Old Aug 18, 2003 | 10:25 AM
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Default Late model C4 speedometer

I thought the 91+ model C4 had a electronis speedometer that reads you speed in led numbers? At least thats what mine is. My question is this. I thought the speedometer maxes at 199. I say this because i thought i remember ppl saying when you go above 200 mph say on a dyno or something it flips back over to 0 and 201 reads 01 and so on. Well in the new issue of either vorvette fever or vett magazine they had an article about vett dashs of many years and the shot they had of the dash that looks like mine says 999mph? can someone explain this? im tempted to change my settings to KPH and go up to about 120mph since that would be 200kph and see if it rolls around or if a 2 shouws up.
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Old Aug 18, 2003 | 10:27 AM
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Default Re: Late model C4 speedometer (1996man)

I thought I remembered reading that the dash would read till 250 then start counting back.
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Old Aug 19, 2003 | 12:16 AM
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Default Re: Late model C4 speedometer (1996man)

Well, there are enough LCD segments to make "200". Or for that matter, an "888" or "999"! I guess it depends if the computer's speed sensor is calibrated to 200+.

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Old Aug 19, 2003 | 01:17 AM
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Default Re: Late model C4 speedometer (90 Corvette ZR-1)

I thought it hit 199, then started over
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Old Aug 19, 2003 | 05:43 AM
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Default Re: Late model C4 speedometer (1996man)

I know for a fact that it reads over 200 in KPH mode I've hit about 245 a few times.
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Old Aug 19, 2003 | 09:36 AM
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Default Re: Late model C4 speedometer (90EXPVette)

Same here. In KPH mode is shows more than 199...don't know how it is in MPH - never been above 199 mph... :D

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Old Aug 19, 2003 | 10:08 AM
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Default Re: Late model C4 speedometer (Ray8)

It should roll right past 200. It does in KPH so why would MPH be any different.
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Old Aug 19, 2003 | 11:18 AM
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Default Re: Late model C4 speedometer (1996man)

It'll show 255 and that's all becaust of the 8-bit computer is incapable of showing anything higher. :cheers:
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Old Aug 19, 2003 | 04:52 PM
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Default Re: Late model C4 speedometer (ShawnZR-1)

QUOTE:It'll show 255 and that's all becaust of the 8-bit computer is incapable of showing anything higher.
------------------------------------

I don't really want to start an argument, and the speed may max at 255, but it has nothing to do with the fact that the computer is an 8-bit CPU. 8-bit computers are capable of displaying numbers much larger than 255. Its simply a matter of the programming. Most computers prior to the 80s were 8 bit, we could easily have large numbers stored and displayed.

Sorry, just couldn't let that go
:D
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Old Aug 19, 2003 | 05:04 PM
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Default Re: Late model C4 speedometer (Topless87)

i thought somebody once had a picture with their car on the dyno with the tach at like 6 grand it and speedometer read 02mph?
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Old Aug 19, 2003 | 05:19 PM
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Default Re: Late model C4 speedometer (Topless87)

I don't really want to start an argument, and the speed may max at 255, but it has nothing to do with the fact that the computer is an 8-bit CPU. 8-bit computers are capable of displaying numbers much larger than 255. Its simply a matter of the programming. Most computers prior to the 80s were 8 bit, we could easily have large numbers stored and displayed.

Sorry, just couldn't let that go
:D
All right... how bout just saying there is no reason to suspect GM used anything larger than an 8-bit register to hold the vehicle speed? :smash: :D
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Old Aug 20, 2003 | 12:50 PM
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Default Re: Late model C4 speedometer (Topless87)

QUOTE:It'll show 255 and that's all becaust of the 8-bit computer is incapable of showing anything higher.
------------------------------------

I don't really want to start an argument, and the speed may max at 255, but it has nothing to do with the fact that the computer is an 8-bit CPU. 8-bit computers are capable of displaying numbers much larger than 255. Its simply a matter of the programming. Most computers prior to the 80s were 8 bit, we could easily have large numbers stored and displayed.

Sorry, just couldn't let that go
:D
Oh, now that was a nice catch! I have to give you that one! Ok, to clarify: the register buffer for the speedo is only 8 bit so in that light, there is no way the speedo can display more than 255. :cheers:
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