nitrous arming question
fry
If that's what you're asking then no, at least I don't think so. That's how I spray because it's hard to get traction. I floor it in first, the second after it shifts into 2nd I hit the switch and the nitrous sprays because I'm WOT already.
Fry
Fry
Fry
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However, I've read that if the fuel noid sticks shut for whatever reason the FPSS will not help you in this situation because with the fuel noid being stuck shut, there is still fuel pressure, but no fuel going in with the nitrous

You would want something like a wideband to be able to detect a lean condition so your set up is very safe.
Dynotune makes an air/fuel ratio switch that runs off the o2 sensors and if it detects a lean condition, will also shut off the nitrous kit. It is cheaper than a wideband and I would imagine is good enough to keep your engine from being damaged.

