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Why is the tach so far off?

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Old Oct 4, 2009 | 09:09 PM
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tmak26b
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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 Oct 4, 2009 | 09:11 PM
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9krpmrx8
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Nope but it is off.
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Old Oct 4, 2009 | 10:46 PM
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Its to make the car more fun
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Old Oct 5, 2009 | 03:06 AM
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much2saxy
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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 Oct 5, 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 Oct 5, 2009 | 10:52 AM
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9krpmrx8
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At 9k my Scangauge II reads about 8450RPM.
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Old Oct 5, 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 Oct 5, 2009 | 10:55 AM
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9krpmrx8
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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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