My zex kit should be here tomorrow. I want wire it up to the steering wheel MODE button and also use the built in tps switch.

I want to wire the TPS voltage (4.5v) to a SPDT relay and use the Mode button as my switch. Basically nitrous will only spray if the car is at WOT and the mode button is pressed.

I know all about rpm window switches, progressive controlls, etc.... I want something stealth. I also want to be able to floor the car and not have nitrous engage, eventhough it is armed. We do a little sand bagging around here when racing.

So I plan on using a relay like this:


Pin 30 will be voltage from TPS
Pin 86 will be connected to green wire (power button on steering wheel)
Pin 85 will be connected to red wire (mode button on steering wheel)
Pin 87 will be connect to zex brain box TPS input wire

Pins 86 and 85 are seperated by a coil. When one side is + and the other is -, the coil becomes magnetized and pulls a lever to connect 30 and 87. The red wire coming from the mode button is 5 volts constant but turns to 0 volts when mode button is pressed. The green wire coming from the power button is 5 volts constant, but turns into 0 volts when pressed. So pressing the mode or power button will start the magnetism therefore closing the lever and completing the circuit, and connecting Pin 30 (TPS) to pin 87 (Zex tps input)

After I hook this up the MODE or POWER button will cause the nitrous to spray but only if the car is at WOT and zex box is armed. Press both at same time, nothing happens, nitrous only will work is one button is pressed at a time.

I plan running a 2 stage setup and will spray a 55-75shot in first to get the car out the hole, then press the mode or power button to spray the 2nd 55-75 shot when i shift to second.

Now all i gotta do is findthat wires running from steering wheel to radio

 

Where are you located in NC?

 

That can be done. Check FSM.

 

Interesting idea. I'd like to see how this pans out. Take pics of your progress, too.

 

Im located in Raleigh. I have the FSM, thats how I know the mode buttons are switched ground. I just need to locate the wires to tap into

 

secret agent man stuff...

 

Do you have to make any internal modifications to the engine to handle a double shot like that?

 

Depends on the size of the shot. For example a 100 shot at 3k rpm will make twice as much power as that same shot at 6k rpm because the engine is breathing in more air per unit of time as the rpms increase. so isntead of running a big shot and spraying it down low, fighting traction, and stressing the motor. its best to do progressive or staged shots.

 

I was reading your uprev thread about torque management. I have tuner on my cable if you want to try it out let me know. I visit family in Goldsboro from time to time. I will be that way in 2wks.

 

 

got every thing hooked up and it works fine.

didnt take pics of the install, but it was easy. I used the 5v throttle signal off the pedal (yellow wire above pedal) and in doing so I didnt need the zex resistor. I used the mode button wire off the steering wheel (red wire). I did have to put in a 12volt zener diode into the red wire to block the 5 volts from steering wheel.

 

I'm slow, so bear with me, but -

So in first, you're just not pressing the button and getting stage 1 only. But when you shift into 2nd and later gears, you can press the button so that you end up getting both stage 1 & stage 2 shots simultaneously?

With the goal being better traction in 1st, but the best torque & hp possible in the higher gears?

Just one question - as far as sandbagging, couldn't someone tell from looking at your jets under the hood that you are running a second stage?

 

I popped my hood, 10 people checked for nitrous using their eyes and a flash light, nobody spotted it. If you are familiar with a G35, u should be able to spot it.

Right now, im only running one stage 75 shot. AT WOT and having mode pressed on steering wheel, it shoots. Im trying to see what my first stage should be. 75 shot is a lil too much wheel spin coming out the hole and most streets.

Im auto G35, 3.3vlsd, 20x10 rims, with yokohama S drive tires.

 

http://www.youtube.com/watch?v=CllXD...e_gdata_player

 

Less N20 and more traction off the line would be faster lol

 

actually thats faster. I thought the same way u did, but the car is moving while spinning. On that launch, I basically torque braked to 2200ish, punched it, then a split second later pressed the nitrous. Most lauches, I do the same thing, but let the tires chirp 3 times, then hit it.

My car falls on its face from 2500-3000. The 75 shot slings it out the whole hard. if it spins too much I can just left off the button and keep the car floored. With the steering wheel controls, my left thumb is my traction control

 

Wish my controls were setup like that. I like it.

 

Can we get some install pics ?

 

sure