AmericanIron98

Is it ok to run nitrous on my stock npi 4.6? Just a 75 or 100 shot. If so or if anyone has done it what should I look out for?

MU71L4710N

its fine, plenty of people running that much of a shot on bottom ends. make sure you get it dyno tuned though and get all the safety switches (WOT switch, window switch, fuel pressure cutoff)

AmericanIron98

Not quite sure what the window switch does?

Black_GT_02

as long as you dont go over 125 shot you'll be fine.

try your hardest to get it tuned though

5pointslow91

im prob going to do this too down the line, 75 shot w a tune 4 it

tbirdscwd

Window switches only allow the nitrous to be used in certain preset rpm ranges to help prevent engine damage. Usually the low end is set around 3,000rpm to prevent a backfire or severe lean condition and on the top end set below the rev limiter so that you don't hit the rev limiter while injecting nitrous causing another severe lean condition. Either one of those cases can cause catastrophic engine failure.

On wet kits it will also help to prevent fuel "puddling" in the intake manifold which when ignited will go boom, take your intake with it and most likely catch you whole engine compartment on fire.

SeanAndKate

100 shot is fine. If i was you id use a dry kit. Anything less then a 125 shot using a wet kit is pointless and dry kits are easier and safer for first time sprayers.

MU71L4710N

wet kits are still safer when the proper safety switches are in place IMO. and dry kit will be more expensive because you'll need fuel injectors and such.

tbirdscwd

From what I've seen, wet kits themselves cost a bit more but most dry kits will require larger injectors and a tune in addition to the kit. I lucked out and found a deal on a NOS 05116 kit on ebay for $325 new. It's a dy kit that comes with a window switch, WOT switch, low fuel pressure cutoff switch, and fuel enrichment module so there is no need to get bigger injectors. The kit runs anywhere from $700-850 depending on what retailer you go through, but it has absolutely everything you would need for the install and is made specifically for the 99-04 Mustang GT.

AmericanIron98

Someone was telling me I need some type of switch to keep buring the nos even after a pass because of excess nitrous that is in the system. If I do not do this it will bog my car down and cause it to backfire the next pass. Is this True?