Is it ok to run four solenoids off of one relay or progressive controller?
NX fuel/nitrous solenoids.

 

I would think it to be OK, as long as you're combined amperage draw for the solenoids, plus a little headroom, doesn't exceed the rating of your relay.

 

I amp clamped it to see what it would be, but I did it with the bottles of - no pressure on solenoids.

It was well under the 40 amps. I think with bottle pressure on the solenoids the amps would increase.

It's a direct port system on an LT, so it's a bit hard to pull every plug or nozzle to get an accurate amp reading from the solenoids.