So, I was getting some big lean spikes, and figured I try to put the FPSS after the fuel solenoid and use it to activate the N20 solenoid. It has been discussed a few times here but I don't know of anyone who tried it.
This is on a rail style direct port, and man did it work perfectly! Figured I'd share.
Check out the before and after.

Before



After

 

I am assuming you are running the ground for the nitrous solenoid only through the FPSS....

 

sounds like a good idea. post a pic of how you put it in there,and what fitting you used to do this. Im assuming you used an adapter -4 fitting with the female pipe hole to mount the fpss in, and ran that on the output side of the solenoid, then from the other side of that the fuel line ties back in before goin down to the jet?

 

what did you set the fpss at? your fuel pressure setting?

 

fpss is set at 3-4psi
flowing fuel pressure is at 9psi

 

I don't have a pic of that, but it sounds like you are describing it right.

 

WE did on a 632 engine on the dyno, and the thing went stupid rich for a breif moment, but different world for sure.
So you going to run another fpss so the fuel noid will not open unless you have enough fuel pressure and then the nitrous.
good safe data that it worked on your car.
Ricky