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Why is the tach so far off?

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Old 10-04-2009, 09:09 PM
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Why is the tach so far off?
The stock tach seems to be accurate up until 6000RPM. At 9000, it is off by nearly 500RPM. Anyone have an idea as to why?

Thanks
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Old 10-04-2009, 09:11 PM
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Nope but it is off.
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Old 10-04-2009, 10:46 PM
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Its to make the car more fun
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Old 10-05-2009, 03:06 AM
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This is a problem with the 09's as well. My tach shows a higher rpm than it should. Plus, the discrepancy grows exponentially as rpm's climb.
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Old 10-05-2009, 10:41 AM
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Off by 500 rpm at 9k? I had no idea it was that close.

How did you measure the actual rpm?

Ken
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Old 10-05-2009, 10:52 AM
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At 9k my Scangauge II reads about 8450RPM.
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Old 10-05-2009, 10:53 AM
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yeah it off by 500 rpms, thats why i shift at 9.5k
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Old 10-05-2009, 10:55 AM
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Yeah I go past 9k as well and there is no noticeable fuel cut. I just can't stop!!
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