Do not floor it from a stand still unless you like looking at the inner working of your engine and/or manifold. It is meant to be used when the engine is at higher RPMs. So roll into the throttle and somewhere around 4k + hit the gas. You dont want to keep on WOT for too long for risk of burning out rings or other critical components.
Since your in Miami, goto Murrays Speed and aks them their thots and ask whatever questions u have. heres a few below from NX.
Q: How much nitrous should I use and what is a "shot"?
A: A "shot" is simply how much horsepower you will get. Nitrous Express, unlike other manufacturers, measures their systems using "wheel horsepower" (whp), which is usually about 15% less than standard flywheel horsepower (hp). So a NX 50 shot will give you 50 whp and about 59 hp. Keep in mind that your torque will go up much more than your horsepower, and will come in at a lower rpm. This will have the effect of forcing you back in your seat when you activate the nitrous. Nitrous Express is also unique compared to other nitrous companies in that they offer a 35 shot designed specially for new nitrous users. This is a great option to have if you are just beginning and are unsure about using large shots.
35-40 Shot: You shouldn't need to purchase anything but 1 degree colder non-platinum spark plugs (iridium is preferred).
50 Shot: Get a set of 1-2 degree colder non-platinum spark plugs, preferably iridium.
Q: How should I mount the bottle?
A: Mount it at about a 15-degree angle with the valve end higher and pointing towards the front of your vehicle.
Q: What should I know about nitrous pressure?
A: Keep it between 900-1050 psi. A warm bottle will have a higher pressure than a cooler one. On the NX gauge, the needle will be in the green area if it is safe to use. If it is too low, you will not get enough power, too high and it can cause damage. Too heat up the bottle, use a bottle warmer (included in the GenX accessory kits). To cool it down, use a wet towel or chamois.
Q: How long does a bottle of nitrous last?
A: You use about .8 lbs of nitrous for every 10 seconds of use on a 100 shot application. For other shots, divide the above usage by the correct amount (e.g. a 50 shot will use .4 lbs every 10 seconds). Nitrous costs about $3.50 - $5.00 a pound. your typical bottle which comes with kits are 10lb bottles.
You will want to get a new fuel pump and fuel filter also! i forgot ab that. you dont want any fuel pressure loss. use 92-93 octane also to prevent detonation. Higher octane burns slightly late to retard timing a little which is good for the engine.
http://www.atlanticspeed.com/productcar ... ategory=98