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how much is the factory tach off?

PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

how much is the factory tach off?

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Old

Feb 12, 2008 | 01:28 PM

#1

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how much is the factory tach off?

thanks

Old

Feb 12, 2008 | 01:49 PM

#2

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Most of em seem to be about 150-200 rpms.

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Feb 12, 2008 | 01:55 PM

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Is it more that they are "slower" as in response? I know with my car i realistically shift at no more than 6500 RPM when I romp on it but my tach doesn't respond fast enough so i shift a hair after 6100.

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Feb 12, 2008 | 02:10 PM

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Depends on many things. My stock tach can be off as much as 500 rpm on the 1-2 shift, I no longer use the stock tach. lol

Old

Feb 12, 2008 | 02:15 PM

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The gauges are buffered. They don't respond "fast" because it causes wear or some BS reason. Maybe if ppl saw the gauges jerking around minutely they would think something is wrong with the car. So GM takes an average and smoothes out what they display.

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Feb 12, 2008 | 02:28 PM

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I'm talking about some of them being off @ idle, and holding them steady too, at higher rpms.
Most of them that are off, are off about 150-200.

Old

Feb 12, 2008 | 02:31 PM

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mine is off 300 rpms at idle 800 desired rpm, 1100 display.

Ryan

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Old

Feb 12, 2008 | 03:11 PM

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well the reason is i'm banging the limiter around 6500 on the stock tach. the tuner says the limiter is raised to about 7000-7200.

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Old

Feb 12, 2008 | 04:08 PM

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Quote:

Originally Posted by slow

mine is off 300 rpms at idle 800 desired rpm, 1100 display.

Ryan

Same here.

Old

Feb 19, 2008 | 08:11 PM

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From: Vancouver,[KITSILANO].B.C. Canada *WestCoast*

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I have a AUTO-METER TACH ..it reads about 200 RPM's higher all the way through the powerband.

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