my set is purge kit and wet system 100 Shot but I'm having trouble on what pin to tap into? I've read J1 52, J1 53, J2 56, but nothing for certain... and what to do with the wire once I'm tapped into the pin? do I hook it up to the N20 activation switch? any help is appreciated.

 

Red pcm connector pin #56. In my truck I have two relays off the window switch so I only affect timing and fueling adjustments when under nitrous use. One relay provides power to the nitrous solenoid, the second grounds the wire going to pin#56. You'll have to setup the switch input parameter (valet, none, nitrous monitor) and then adjust fuel and timing tables in the COS section

 

everything is good in the tune I'm just having trouble with the wiring. so once I I tap into pin 56 do I need to send that wire to the the activating switch or just ground it?

 

However you want to do it. Grounding pin #56 is what activates the nitrous functions in the COS. But don't ground the pin near a large current draw, like solenoid grounds and such devices.

 

so I dont have to ground the pin to a switch?

 

In the COS tutorial (efilive tune>help>cos upgrade tutorial>bottom of page 13) You need a switch (of any type) to provide a grounded contact when you want the nitrous function of the COS to be active. It could be a relay from the nitrous window switch, a rocker switch, a wot switch, just some type of switch contact that will activate the pcm COS nitrous function when you're ready to use it.

 

thanks for the help...