 engine rpm mismatch..., how accurate is the dash? |
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| BGman |
 May 22 2005, 04:21 PM
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#1
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Greg  Group: Members Posts: 87 Joined: 18-January 04 From: Owensboro, KY Member No.: 1,575 Region Association: None  |
Is it completely unusual to have a 200 rpm mismatch between the dash and a stand-alone tach/dwell meter that you hook directly to the coil? My gut feeling is to believe the meter in my hand.
-g |
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| BIGKAT_83 |
May 22 2005, 04:37 PM
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#2
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Senior Member Group: Members Posts: 1,798 Joined: 25-January 03 From: Way down south Bogart,GA Member No.: 194 Region Association: South East States 
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I've made a setup with a function generater to recalibrate tachs for V8 conversions and use it to check the tach and make sure its good before I go to the trouble of opening it up.
If you are only off 200rpm at 6K that would be better than any I've seen yet. The 7 or 8 I have done are all over the place from 5 to 20% wrong. Most reading to high. Remember that these are 30 years old. Bob (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) |
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| ArtechnikA |
May 22 2005, 04:50 PM
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#3
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
the Crane HI-6 has a tach-calibration function - also good for calibrating a shift light.
i haven't tried a factory tach but my AutoMeter has been spot-on. |
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| BGman |
May 22 2005, 09:00 PM
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#4
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Greg Group: Members Posts: 87 Joined: 18-January 04 From: Owensboro, KY Member No.: 1,575 Region Association: None |
Thanks Bob-
Your reply leads me to the obvious next question- if I know my tach is 200 rpm off, is there an easy way to true it? Ultimately you are right, 200 rpm is minor...BUT, if it is a fairly easy process I might give it a whirl... |
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| bd1308 |
May 22 2005, 09:21 PM
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#5
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Sir Post-a-lot Group: Members Posts: 8,020 Joined: 24-January 05 From: Louisville,KY Member No.: 3,501 |
hey, are you greg from bowling green? i've been trying to call you......
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| Rhodes71/914 |
May 22 2005, 09:34 PM
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#6
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Glacier Group: Members Posts: 1,374 Joined: 8-August 04 From: End of the Road, Alaska Member No.: 2,482 |
200 is not bad, mines off 1000.
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| redshift |
May 22 2005, 10:00 PM
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Bless the Hell out of you! Group: Members Posts: 10,926 Joined: 29-June 03 Member No.: 869 |
Mine is off exactly -200 at 5600.
M |
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| BGman |
May 23 2005, 03:48 PM
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#8
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Greg Group: Members Posts: 87 Joined: 18-January 04 From: Owensboro, KY Member No.: 1,575 Region Association: None |
Yep that is me...sorry I could not meet up with you this past weekend. I REALLY wanted to come- but had too many commitments at church sunday morning to be able to skip. Sounds like you guys had a good time.
I sent you a PM. |
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