i have seen a few posts on the internet of people trying to do the same thing i am, how ever the ones i found are incomplete and a bit misguided i suppose.
so let me start with the complete idea first. i want to add 6 (one for each cylinder) secondary injectors to my v6 petrol gas engine. have it controlled by my arduino uno, using an input signal from my MAP sensor. it will read overall manifold pressure (vacuum or boost), the coolant temperature sensor, and the air intake temperature sensor. then control the spray of water/methanol mixture into the combustion chamber.
the arduino would turn on with the engine, check the fluid level, send a signal to my mega squirt telling it what fuel and timing maps to use, turn on the water pump, calculate the boost level, and temp of the coolant and incoming air, decide how much water/methonal would be necessary, and opening a solenoid sending the water/meth mix to the sprayers which would spray right into the cylinder...
my ideal set up,
a signal from the ignition or megasquirt telling arduino the car is running and its time to play, and kick on the water/meth pump
a level sensor in the water tank sending a signal out to my megasquirt to tell it to switch fuel and timing maps when i run out of water/meth, (wether there is water to be used or not) and to shut off the water pump if empty
sensors already onboard the engine (map, coolant and air temps) telling the arduino "engine conditions"
arduino processing this and sending a signal to the an inline solenoid to open sending to correct ratio of water/meth to the cylinders.
summary.... i have the hardware more or less figured as far as parts to use and the size of the commercial sprayers (not fuel injectors) figured for my horse power goals... but not really all of what is needed to add tot he arduino bored to control everything
my biggest problem here is being able to program the arduino to take in the information and spit out the correct water/meth needed for any given point in time.
ANY HELP, ADVICE, POINTERS, SUGGESTIONS, CONSTRUCTIVE CRITICISM WOULD BE GREATLY VALUED. THANK YOU ALL FOR READING
a little side note/idea)... if i could use fuel injectors (maybe for E85 since they are corrosion resistant) and have the arduino pick up the pulse signal from the megasquirt... or maybe the cam sensor... and have my secondary injectors spray the water/meth mixture only when the corresponding valves are open... I don't know if that would be beneficial or not, but it sounds like it would be.