The instructions state to take out the green wire from the stock ECU harness and insert the wire from the Xede instead. Then connect the stock ECU's boost wire into another male wire from the Xede harness. This is basically like plugging in the Xede between between the stock boost wire - sort of like an inline fuse.

If I disconnect the Xede from the car's ECU harness (ie, no power and other signals going to it) but only keep the boost connection as per proper Xede installation, will the car behave like stock or will the boost signal be messed up. In other words, will the signal just flow through the Xede as if it was not there when everything is disconnected other than the boost wire. An example is an EBC. If you turn off the power to the EBC, the car behaves like stock even though all the connections for it are still there.

Of course, the hose with the pill will need to be swapped for proper function.

Why do I want to know this? I want to do some before and after comparison testing and don't want to go through the trouble of fiddling with the boost wire on the harness. It is easy enough to unplug the harness connections, but I don't feel like playing with the little screwdrivers and the individual wires to go back and forth between stock and Xede.

Thanks for any input.

 

I have never tried this but I suspect in the condition you have described it sounds as though your boost will only be able to achieve 10 psi....
You will have to ask the man himself.....We will be doing another "Chat to Shiv" session on our web site next week... you will need to pre register if you want to partake here:
http://forum.dyno4mance.com/viewtopic.php?t=28
I am sure this will also be a good time for other members to grill Shiv about the 1 lap first hand..