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speedometer is not reading right any suggestions

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Old Apr 29, 2007 | 07:06 PM
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Default speedometer is not reading right any suggestions

i got my car and the speedo appeared to be off. i thought it could have gears and after figuring out i most likely dont( i bought it used with a few mods) so when it was programmed for stock 3;43's the speedometer was anywhere from 10-15 mph offf, i now have it programmed for 4:10s and its close to beign right but not exact. any idesa on why it would read off besides gear or tire size?
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Old Apr 29, 2007 | 07:20 PM
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Maybe a faulty speed sensor.
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Old Apr 29, 2007 | 07:39 PM
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I'd play with the calculator at www.f-body.org/gears/
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Old Apr 29, 2007 | 10:00 PM
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well that says im supposed to be at 89 in 6th gear at 2000 rpms. it does not seem like im going that fast at all. does anyone car read this with the ls1 m6?
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Old Apr 30, 2007 | 02:17 AM
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hook it up to efi live and re-adjust it
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Old Apr 30, 2007 | 07:24 AM
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Originally Posted by staringback05
hook it up to efi live and re-adjust it
i have hptuners but what do i readjust besides wheel size and gear ratio?
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Old Apr 30, 2007 | 11:24 AM
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hmm not sure with that....ive never used hptuners, but i know when i did my 3.73s we just change those two things on efi live and it solved the problem
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Old Apr 30, 2007 | 11:26 AM
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Originally Posted by 2004SSS
well that says im supposed to be at 89 in 6th gear at 2000 rpms. it does not seem like im going that fast at all. does anyone car read this with the ls1 m6?
Yup man i sure do. 89 90mph i turn 2grand flat in 6th
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Old Apr 30, 2007 | 11:33 AM
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I have my HP Tuners up right now. Give me your tire size so I can calculate diameter. Gear ratio?
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Old Apr 30, 2007 | 09:09 PM
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see im not 100% sure on the gear ratio looks like im going to be pulling the rear cover to find out for sure. i reset it to 3:43's and sure enough i was at 2k at 89mph. but i know i wasnt going that fast . so it must have gears or somethign is definatly wrong.

i have stock sized tires on stock rims.
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Old Apr 30, 2007 | 09:49 PM
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Is this your first fbody? They're suspiciously smooth at higher speeds. I have to pay attention or I'll run down the highway at 90 in 6th.
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