Holley HP and MPH

[will69camaro]

How many of your inputs do you have left with the holley?

Do you have the vss sensor on the trans? Can wire it into Holley for the mph signal and set conditions against that.

[Tony V]

Originally Posted by will69camaro

How many of your inputs do you have left with the holley?

Do you have the vss sensor on the trans? Can wire it into Holley for the mph signal and set conditions against that.

yes, i've got a VSS sensor, i'm currently only using one output and zero inputs so I have plenty of I/O room. although i was using the VSS to drive my speedometer and not sure if I could "split" the signal to both the speedometer and HP.
I also read that VSS sine wave couldn't be read by the HP, that i either needed to convert it to a square wave digital signal or find use a different sensor that outputs a digital signal. not sure if there's any truth to that....but i can try.
thx for the input

[andrewb70]

The HP can't use a stock VR style VSS, only Hall effect. The Dominator can read both.

Andrew

[Tony V]

Originally Posted by andrewb70

The HP can't use a stock VR style VSS, only Hall effect. The Dominator can read both.

Andrew

Thx Andrew......i'll bag the idea for right now.

[will69camaro]

Just touching on this, do you need to reference the speed? If it's PWM, just have it turn down as it approaches desired temp. As speed increases, temp will drop and the fans will as well without needing to reference the VSS.

Just a thought.

William

[Tony V]

Originally Posted by will69camaro

Just touching on this, do you need to reference the speed? If it's PWM, just have it turn down as it approaches desired temp. As speed increases, temp will drop and the fans will as well without needing to reference the VSS.

Just a thought.

William

I was going to control the fan speed with CTS and Speed but getting a speed signal to the HP wasn't in my scope. right now its working based on temp.... a simple straight line slope as its getting hotter the PWM % increases.

[andrewb70]

Originally Posted by will69camaro

Just touching on this, do you need to reference the speed? If it's PWM, just have it turn down as it approaches desired temp. As speed increases, temp will drop and the fans will as well without needing to reference the VSS.

Just a thought.

William

I've been using VSS as part of my fan control strategy, but from experience I can say that it isn't really needed. Personally if a car has A/C it makes more sense to do CTS vs. A/C pressure. If no A/C then you can do CTS vs. engine oil temp.

Andrew

[Larry R]

Originally Posted by andrewb70

I've been using VSS as part of my fan control strategy, but from experience I can say that it isn't really needed. Personally if a car has A/C it makes more sense to do CTS vs. A/C pressure. If no A/C then you can do CTS vs. engine oil temp.

Andrew

How does one set up a CTS vs A/C pressure? Where and how do you get A/C pressure. My car has a trinary switch is that used? I do have a VSS in my car but I am intrigued by the idea of using A/C pressure.

Thanks, Larry