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RPM is off

Old 11-02-07, 12:54 AM
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RPM is off

So my car sat for a few months and the battery died. I have since got it running again and the rpm's are off. I have a Apexi Neo. They are about 500-700rpm lower than the actual tach and get worse as you go up. What could cause this? None of my other settings were messed up. I think it has a function that keeps your settings even if the battery dies. So what could be the problem? Thanks
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Old 11-02-07, 09:10 AM
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Its the stock tach that is off. The all versions of the safc read the rpm correctly.
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Old 11-27-07, 12:34 PM
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Definitely a tach problem. The AFC is more accurate than the tach
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Old 11-27-07, 12:45 PM
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Well it wasnt off this bad before???

Originally Posted by fc3s63tx View Post
Definitely a tach problem. The AFC is more accurate than the tach
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Old 11-29-07, 06:09 AM
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how do you know the stock tach read more accurate before?
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Old 12-01-07, 11:46 PM
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Well because I used to watch them both. Its wasnt really off below 3grand but now it is. So I shouldnt worry then and just go by the safc? Also what would make it do this all of a sudden? Thanks
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Old 12-02-07, 10:41 AM
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Mine varies how much its off. It can be 100 or up to 500rpm off.

I think the stock tach just needs to be recalibrated but I have no idea how. I heard about using a battery charger some how to calibrate it.
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