TPS voltage without engine running?

[Josh22855]

I am setting up my NOS mini 2 controller and the instructions tell me to have the ignition switched on without the engine running and I should be able to see my TPS voltage.
I only see a very sudden small voltage change when I switch the ignition on, when I press pedal to the floor there is zero voltage change, the volts just stay @ 1.0 with no movement. I recall reading somewhere else that the individual had to actually have the engine running to get through this step to see voltage change, I am trying to avoid doing that.
Any and all help is appreciated.

 

[Josh22855]

Hooked up HP tuners to see if TPS voltage would move with engine off and ignition on and sure enough the voltage # would not move with engine off, however you can see the throttle position percentage move as I pushed throttle all the way down.
1st picture is throttle at a rest and 2nd picture is with pedal all the way down....what to do what to do....

 

[Josh22855]

On Brown/orange wire.

 

[Wild one]

You need to have the key in the run position and manually open the throttle blade by hand for it to work. The throttle blade doesn't move unless you do it by hand or start the truck.

 

[Josh22855]

You need to have the key in the run position and manually open the throttle blade by hand for it to work. The throttle blade doesn't move unless you do it by hand or start the truck.

Hooked up a scanner to it and was able to get a voltage reading via a scanner. Now a separate issue, the RPMs are showing around 15% higher on handheld NOS controller than my truck, oh the Joy of hot roddin. LoL
On this picture the truck RPMs on the dash display was 870 or so. I guess I will just have to account for the deviation when I set the RPM limits.

 

[Wild one]

Hooked up a scanner to it and was able to get a voltage reading via a scanner. Now a separate issue, the RPMs are showing around 15% higher on handheld NOS controller than my truck, oh the Joy of hot roddin. LoL
On this picture the truck RPMs on the dash display was 870 or so. I guess I will just have to account for the deviation when I set the RPM limits.

View attachment 248003

I'd trust the controllers rpm reading more then I'd trust the tachs reading

 

[Josh22855]

I'd trust the controllers rpm reading more then I'd trust the tachs reading

Well the scanner that the shop was using matched up perfectly with the truck's RPM reading, the handheld NOS controller was the only one reading a little bit higher, I even hooked up my wire from the NOS controller to the negative coil wire and still showed a higher RPM value.

 

[Wild one]

Sounds like you know the differance in the readings. You'll have to compensate for that differance,either use one or the other for your nitrous engagement,shouldn't make a differance if you compensate for the controller being a slightly higher rpm reading. Don't use the percentage number use the actual rpm number differance number.If the controller reads a 100 rpm higher,then calculate that into your on engagement number.If you want it to kick on at 3,000 tach rpm,set the controller to kick on at 3100.