VSS input requirements
Thread Starter
Staging Lane
Joined: Sep 2018
Posts: 89
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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?
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.
Thread Starter
Staging Lane
Joined: Sep 2018
Posts: 89
Likes: 0
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.
Thread Starter
Staging Lane
Joined: Sep 2018
Posts: 89
Likes: 0
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?
TECH Enthusiast
Joined: Nov 2016
Posts: 711
Likes: 6
From: PNW
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.
