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LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

How far off is the stock tach?

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Old Jul 20, 2003 | 03:53 PM
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96z
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From: Buffalo, NY
How far off is the stock tach?
Has anyone measured or had a stock tach that was off? I think mine maybe off especially in the upper RPMs.

Has anyone ever varified exactly how much its off?
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Old Jul 20, 2003 | 04:02 PM
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Usually read 150-200 rpms too high..
Shift-Lite indicated and Freescan indicated..

Cody
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Old Jul 20, 2003 | 04:27 PM
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Mine is off 200 rpm throughout the entire range.

John
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Old Jul 20, 2003 | 04:31 PM
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same here....200rpm off throughout the enitre range, as verified with datamaster and my autometer.
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Old Jul 20, 2003 | 04:31 PM
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96z
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Originally posted by 97 RedSS
Usually read 150-200 rpms too high..
Shift-Lite indicated and Freescan indicated..

Cody
For example when your really at 5800 it reads 6000?
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Old Jul 20, 2003 | 04:36 PM
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mine is 200 rpm fast compared to my scanmaster.
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Old Jul 20, 2003 | 10:27 PM
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mine is about 200rpm off, according to autotap. and my speedo is 3mph off
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Old Jul 20, 2003 | 10:33 PM
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CamaroBoy96Z28
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From: Madison Heights, MI
Mine used to read 1000 rpm at idle, after indiglo gauge install I set it at 900 for idle since that was the most mentioned idle speed that I've read in past posts.
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Old Jul 20, 2003 | 10:37 PM
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94formulabz
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From: PA
For my 3 dyno pulls i tried to let off at 6000 rpm (i was driving) and the computer also indicated 6000. So it seemed mine was pretty good. I was actually expecting it to be off though.
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Old Jul 20, 2003 | 11:15 PM
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200-250 for mine i have never watched to see if it gets farther off at higher rpms on the scanmaster.
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Old Jul 20, 2003 | 11:18 PM
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ChickenScreamer94
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From: Crossville, TN
hmmm....I think I see a trend here My basically stock car says 6k on shifts but is programmed to be around 5700ish at the factory i believe so about 200 rpms off
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Old Jul 21, 2003 | 01:27 AM
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S8ER95Z
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From: Quad Cities
Yeah ive noticed when I manually shift at ~5800rpms it doesnt feel as fast and leaving it in D... since the auto shifts past 6K on the tach Mine must be off about the same as you guys.
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