tach signal-4 pulse to 8 pulse??
06-26-2007, 01:31 AM
#21
FWIW In EFIlive its under System>Tach
This is their explanation of the numbers:
The number of crankshaft medium resolution pulses (24x pulses) to hold the tach output high (should match {G1205} "Tach Pulses Low").
The number of output pulses P is calculated as P=24/(N*2) where N is the value of this calibration.
Sample values for this calibration:
For 12 pulses, use N= 1
For 6 pulses, use N= 2
For 4 pulses, use N= 3
For 3 pulses, use N= 4
For 2 pulses, use N= 6
For 1 pulse, use N=12
This is their explanation of the numbers:
The number of crankshaft medium resolution pulses (24x pulses) to hold the tach output high (should match {G1205} "Tach Pulses Low").
The number of output pulses P is calculated as P=24/(N*2) where N is the value of this calibration.
Sample values for this calibration:
For 12 pulses, use N= 1
For 6 pulses, use N= 2
For 4 pulses, use N= 3
For 3 pulses, use N= 4
For 2 pulses, use N= 6
For 1 pulse, use N=12
03-09-2020, 12:59 PM
#22
HP Tuners or EFI Live7. You don`t need any external box or convertor. Just have whoever is reprogramming your PCM set it up. BTW the factory LS1 tach signal is a 2 pulse per rev and the tach for your camaro is looking for 4 pulses per rev not 8.
You could also get a convertor box from dakota digital, or baker electronics(check e-bay), but I think it is much easier to just change the parameter in the PCM.
You could also get a convertor box from dakota digital, or baker electronics(check e-bay), but I think it is much easier to just change the parameter in the PCM.
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G Atsma (06-30-2021)
06-30-2021, 10:03 AM
#25
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Just fixed this on mine this afternoon--much easier to fix in HPTuners than pulling the gauge back out. I'm using a 99 PCM, not sure if the 98 has the same option--apparently it's OS dependent. Stock, both of the "tach resolution" values are "6". Change both of them to "3" for an 8-cyl tach.
06-30-2021, 10:06 AM
#26
TECH Senior Member
HPtuners doesn't reprogram anything. YOU do it WITH HPtuners....
They just market the goods for DIY tuners...
They just market the goods for DIY tuners...
