stock tack not accurate (TACH) t-a-c-h
03-13-2008, 10:17 PM
#1
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stock tach not accurate
When i got my car dynoed a few months ago on the stock ecu the dyno tech. told me my stock tach was very inaccurate and the dyno showed a big difference high end. Today when i was doing some tuning i was watching my computer screen and noticed it too. my tach is OFF... megasquirt shows 3750 rpm which is obviously correct while the stock tach shows 4000 or more. Is there any way to calibrate the stock tach ???
Last edited by 240_to_miata; 03-13-2008 at 10:39 PM.
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03-13-2008, 10:22 PM
#3
The tach doesn't really need to be spot on. It would be nice, but you'll survive as long as it is repeatable. If you hit an actual 7000rpm at an indicated 7300rpm, who cares as long as it is always indicated at 7300rpm. As long as it is repeatable, you should know where fuel cut is and all that good stuff.
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03-13-2008, 10:28 PM
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Mine reads 7800rpm when my shift light comes on and megasquirt reads 7200. Does it matter that much to you? 90% of factory meters are less accurate than autometer's gauges (which are pretty far off aswell) cause they're budget cheap... Hense why oil pressure and volt meters are normally just idiot gauges which don't actually show pressure/charge.
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03-13-2008, 10:33 PM
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haha... thanks for editing the title. i was on the phone with my gf trying to "listen" to her and type at the same time.
Guess ill live with the inaccuracy....... or get a huge ricer gauge
jk
Guess ill live with the inaccuracy....... or get a huge ricer gauge
jk
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03-13-2008, 10:51 PM
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good to know that its natural. The dyno tech made it seem like there was something wrong with my car... he was dynoing a variety of cars that day and only commented about my tach. I guess i don't have to fear going into the red so much any more, haha.
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Cause an inaccurate tachometer is the mark of a terrible car... So whats that make 98% of Fords that don't HAVE a tach?
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