VSS input requirements
10-31-2018, 06:49 AM
#1
Staging Lane
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VSS input requirements Hi,
I'm trying to setup VSS on a conversion to enable the cruise control. To do this, I need to know how many teeth there are on the shaft that the VSS reads from so that I can make up a trigger wheel to mount on the prop.
The second question is, do the automatic and manual setups in the P59 PCM expect to see a different number of pulses, i.e. Are there a different number of teeth on the output shaft of a manual vs an automatic vs a transfer box mounted vss?
I'm trying to setup VSS on a conversion to enable the cruise control. To do this, I need to know how many teeth there are on the shaft that the VSS reads from so that I can make up a trigger wheel to mount on the prop.
The second question is, do the automatic and manual setups in the P59 PCM expect to see a different number of pulses, i.e. Are there a different number of teeth on the output shaft of a manual vs an automatic vs a transfer box mounted vss?
10-31-2018, 07:06 AM
#2
Yes.
40 on a 4L60E
17 on a T-56
If you are making a trigger wheel why not make it how you want it and adjust the calibration accordingly? Another option is running the VSS from the reluctor wheel on a drive hub from the ABS if your vehicle was previously equipped or had a option for it.
40 on a 4L60E
17 on a T-56
If you are making a trigger wheel why not make it how you want it and adjust the calibration accordingly? Another option is running the VSS from the reluctor wheel on a drive hub from the ABS if your vehicle was previously equipped or had a option for it.
10-31-2018, 07:09 AM
#3
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Hi, thanks for the quick answer!
I don't have efi live or HP tuners so can't adjust the calibration. I had wondered about using the abs sensor, but it's a 60 tooth setup on a 285/75/16 tyre so without being able to alter the calibration, I run up against the same problem. I also don't know if splicing into the sensor would upset or weaken the readings the ABS ECU sees.
I don't have efi live or HP tuners so can't adjust the calibration. I had wondered about using the abs sensor, but it's a 60 tooth setup on a 285/75/16 tyre so without being able to alter the calibration, I run up against the same problem. I also don't know if splicing into the sensor would upset or weaken the readings the ABS ECU sees.
10-31-2018, 10:39 AM
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I'm not using it for a speedometer, but I would have thought there would be a minimum speed the cruise control would engage at? it's usually at 30ish mph on most cars. Is that not the case with the GM setup?
10-31-2018, 12:55 PM
#7
That’s a good point. But with a 60tooth tone ring that shouldn’t be much of a problem. You don’t need hp tuners either, just need someone who can flash the PCM. I had lt1swap flash mine to my 48tooth tone ring.