Tach signal type
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
The tachometer signal for an LSx is an output from the computer and GM decided to make it output a 2 pulse per revolution signal. The standard V8 signal is 4 pulses per rev. 4cyl`s have a standard pulse rate of 2 ppr, so to make a tach work on an LSx you need to either set it to look for a 4cyl signal or reprogram the PCM to have an 8cyl tach output.
Teching In
Joined: Aug 2006
Posts: 5
Likes: 0
From: Germany
Hi,
*sorry bad english*
We put an LS1 in my 75 Corvette with a T56.
Problem:
The Tachometer is original (4 ppr) an the LS1 makes 2 ppr...
Engine run´s with 4000 RPM - the Tachometer tell me 2000 RPM
What must i do to use the original Tachometer?
We found no Parameter (settings) for the 2 ppr/4 ppr...
Thx
Meiko
from Germany
*sorry bad english*
We put an LS1 in my 75 Corvette with a T56.
Problem:
The Tachometer is original (4 ppr) an the LS1 makes 2 ppr...
Engine run´s with 4000 RPM - the Tachometer tell me 2000 RPM
What must i do to use the original Tachometer?
We found no Parameter (settings) for the 2 ppr/4 ppr...
Thx
Meiko
from Germany
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Originally Posted by Meiko
Hi,
*sorry bad english*
We put an LS1 in my 75 Corvette with a T56.
Problem:
The Tachometer is original (4 ppr) an the LS1 makes 2 ppr...
Engine run´s with 4000 RPM - the Tachometer tell me 2000 RPM
What must i do to use the original Tachometer?
We found no Parameter (settings) for the 2 ppr/4 ppr...
Thx
Meiko
from Germany
*sorry bad english*
We put an LS1 in my 75 Corvette with a T56.
Problem:
The Tachometer is original (4 ppr) an the LS1 makes 2 ppr...
Engine run´s with 4000 RPM - the Tachometer tell me 2000 RPM
What must i do to use the original Tachometer?
We found no Parameter (settings) for the 2 ppr/4 ppr...
Thx
Meiko
from Germany
Teching In
Joined: Jul 2006
Posts: 2
Likes: 0
Can HP tuners reset the tach pulse to work with a vintage car?
(69 Camaro)
If so, how.
I already looked and even searched the help file
Dakota Digital unit is supposed to work for this application (ECM driving older coil driven Tachs But using the ECM to do it directly would be cooler
Thanks
(69 Camaro)
If so, how.
I already looked and even searched the help file
Dakota Digital unit is supposed to work for this application (ECM driving older coil driven Tachs But using the ECM to do it directly would be cooler
Thanks
Last edited by rleconey; Aug 29, 2006 at 02:04 AM. Reason: elaborate
