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01-21-2010, 11:00 PM
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#1 |
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Registered User
Join Date: Nov 2008
Location: Gwinnett GA
Posts: 1,803
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Aftermarket Tach reads a little odd
Just installed an Auto Guage autometer in my '87. It does this weird thing where it reads a different rpm when the truck is cold then when hot. Not much, but noticeable. When cold 2000 rpms is 60mph, when warm, 2000rpms is about 55mph. Tried it a few different times and it still does it. Any idea why? Is that normal?
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1982 K10 SWB 1987 V20 - Sold - Doh! |
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01-21-2010, 11:18 PM
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#2 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,313
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Re: Aftermarket Tach reads a little odd
the truck runs higher when cold
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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01-22-2010, 09:34 AM
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#3 |
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Registered User
Join Date: Dec 2009
Location: MI
Posts: 111
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Re: Aftermarket Tach reads a little odd
Sure the mechanical speedometer isn't the source of the incorrect readings?
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-Josh "Mr. Simpson, there are thousands of people like you with no discernible talent." Duff World Records Division "Yeah, they're called Congress!!" -Homer Simpson |
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01-22-2010, 10:09 AM
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#4 | |
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Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: Aftermarket Tach reads a little odd
Quote:
High gear acceleration is the place you will start to notice a warn clutch first. That was the first thing I had to do to my K20 was yank the engine and reseal it all so the new clutch would last and work right.
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miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
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01-23-2010, 10:37 PM
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#5 |
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Registered User
Join Date: Nov 2008
Location: Gwinnett GA
Posts: 1,803
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Re: Aftermarket Tach reads a little odd
Hey guys, did a trip today, and with the use of my new GPS, i have come to the conclusion that its the speedometer. It reads about 10mph fast when cold, 5mph when hot.
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1982 K10 SWB 1987 V20 - Sold - Doh! |
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01-24-2010, 01:41 AM
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#6 |
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Registered User
Join Date: May 2009
Location: Washington
Posts: 663
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Re: Aftermarket Tach reads a little odd
never heard of a speedo being faster or slower when hot or cold.... weird
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01-24-2010, 02:02 AM
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#7 | |
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Registered User
Join Date: Dec 2009
Location: MI
Posts: 111
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Re: Aftermarket Tach reads a little odd
Quote:
I have had trucks do that, and have had ones that will have a jumpy speedometer when they were warmed up too.
__________________
-Josh "Mr. Simpson, there are thousands of people like you with no discernible talent." Duff World Records Division "Yeah, they're called Congress!!" -Homer Simpson |
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01-24-2010, 02:10 AM
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#8 | |
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Registered User
Join Date: May 2009
Location: Washington
Posts: 663
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Re: Aftermarket Tach reads a little odd
Quote:
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