12-19-2004, 10:52 AM
Join Date: Mar 2002
Re: Enabling Traction Control on non trac control cars
I have used this input wire for multiple uses. Here are a few:
1. Put an actual on off switch on the wire. When the switch is on, you are in low octane mode as it will pull timing out across the board however you set it. When the switch is off, you can run higher octane gas with more timing. I also use the output from the PCM to illuminate and LED or light so you know what mode you are in.
2. Same as 1 but for supercharged or other FI applications, you can flip the switch in case you get some bad gas to eliminate detonation.
3. Use it for nitrous retard. I have it wired so the activation switch for the nitrous and the full throttle switch are both in series. This way, even if the switch is on, the PCM will not retard timing until you are at WOT. I use the system active output from the PCM to operate the nitrous relay. This way, you know when you are spraying, the timing is pulled. If you are like me and like to run stealthy, this works nice as you have no visible timing retard box when you open the hood.
Now, for the wires you use:
You have to add these wires to the PCM most of the time. I have run into a few cars that I suspect the harness may have been replaced and the wires were already there when the car did not have TC.
Pin A23 (red, pin 23) This is the spark retard request wire. This is what tells the PCM that you want the timing pulled.
Pin C27 (clear, pin 11) This is the output wire from the PCM that can activate a relay or an LED or light bulb so you know everything is working.
To test this, I always test it without a power adder. I put a constant retard in across the board and drive then activate a switch. YOu should feel a definite loss of power. Also verify the light illuminates when you push the button. You can drive or just let the car rev a little then activate it to test. Once you have verified it works, hook it up however you plan on using it.
Hope this helps you guys out.
1994 Z28 Vert. M6, bolt ons.
1994 Z28 T top. M6, reconstruction in the works.