the idea behind the smoke switch is changing the voltage sent to the sensor in the intake manifold. by doing so you are telling the engine computer that it is recieving full boost and needs to put in fuel equal to the boost level.
the way i hooked my switch up is i took the 5v lead and tapped into the sensor return line, placing a 10ohm resistor in the circut. so you just need to find a wiring diagram for your manifold pressure and tap into it, or do it the hard way, tap wires until you find the 5v and the return line.
Sensor-temperature/pressure-map – 4 Way Cav Circuit Function
1 K37 18br Boost Pressure Sensor Signal
2 F855 18pk/yl 5 Volt Supply
3 K21 18db/lg Intake Air Temperature Sensor Signal
3 K735 18br/lg Charge Air Cooler Outlet Temperature Sensor
4 K916 18br/or Sensor Ground
its been tried by a few, i dont think it will work on a 6.7 due to the fact that our trucks have a system of computers that use Logic. on a 6.7 when the computers detect a change it trys to adjust somewheres else to make up for it. if you send the full 5vs on the map sensor back to the computer its going to do a few things. one it looks at you rpm, two it looks at your throttle position, manifold pressure and many other things. the truck knows that at low rpm with a low % of throttle it can not have full boost and it will think something is wrong.
so i am not saying that a smoke switch is not possibly I just dont believe that we can do it the same way the 5.9er's do. There trucks dont use logic, they are basically a dumb computer, no pun intended.
If you want smoke why don't you guys add a fuel injector on a switch to the exhaust right after the turbo. You could inject all kinds of liquids that would make smoke. This would not affect the way the engine performs. Don't tell me that this would be a waste of fuel because making it smoke by over fueling the engine does exactly that.
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