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08-30-2014, 09:33 PM
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#1 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Interesting site
I found this site while surfing tonight. Very nice stuff with some good info on what to look for and what mods to do to mine I think. I like the 6.0 SS cam mod.
This may be of help to some of you. Some ECM's tach signal is not strong enough for some aftermarket tach's. This method can be used to “boost” the signal from the ECM. All you do is hook one end of a 680 ohm resistor (SUPPLIED BELOW) to the tach wire, and other end of the resistor to a keyed 12V+. This may not be needed with all tachs and all ECM’s. The pre 2002 ECM’s and tach combinations seem to be hit-and-miss. So far, all 2003+ have had to have it.   http://bdturnkeyengines.com/engine-g...b090cd25be8324
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. Last edited by Andy4639; 08-30-2014 at 09:39 PM. |
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08-31-2014, 09:23 AM
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#2 |
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Registered User
Join Date: Aug 2013
Location: Tecumseh
Posts: 355
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Re: Interesting site
FYI
It's not a matter of the signal is not strong enough. The older blue red PCM tach output is a pulse that goes from zero to 8 volts. The green blue PCM actually provides a ground when the coils fire. A tach needs a voltage transition close to 5 to 7 volts to read. So on the newer pcm's when the coils are not firing the resistor pulls the voltage up to 12 volts then when firing the PCM provides a ground to make the voltage transition across the 5-7 threshold making the tach read rpm.
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Current project 1959 Willys = GEZR TRUK Geezer is a Latin compound word made up of two roots. Gee meaning Urine Stain and Zer meaning your pants are open! FMCDH GBU and GBA http://www.youtube.com/user/aknovaman/videos |
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08-31-2014, 10:17 AM
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#3 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: Interesting site
Its similar info to what we've used here for a while. The OG thread goes back a ways:
"Conventional Tach on LS2" by TR65. http://67-72chevytrucks.com/vboard/s...d.php?t=445975
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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08-31-2014, 06:54 PM
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#4 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Interesting site
Guy's not hammering the info here just thought I would add to it.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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