a dry kit injects only nitrous. it bumps up the fuel pressure and makes your injectors deliver the extra nitrous needed. this is bad for many reasons, some being that your stock injectors are now being worked more heavily, and the nitrous/fuel isn't mixed before it's combusted, rather mixed "during" combustion, so to say. a wet kit is a lot better since it Ts into your fuel line, and gets its own fuel and mixes the nitrous/fuel together at the nozzle in your intake. so when it hits your TB, its already a perfect n2o/fuel mixture. the engine will never know it's there till combustion.
the thing that makes dry kits so shitty, is that they're inneficient, and you'll only get like 75% of the quoted hp. where as with a wet kit, there have been many many dynos where people are getting 95% of the shot rating as WHP, not bhp. for instance, a 65 wet shot will give you 60-65hp, but a 65 dry shot [sometimes, depending on setup] will give you half to 3/4 that.
i wouldn't advise a dry kit, since i've seen many a car go bad from dry kits on the DSM nitrous board. one person has yet to screw up anything with their PROPERLY running wet kit.
the only few ways you can blow up your engine with nitrous are one of 3 basic ways: 1 - your spark plugs are the stock heat range, thus, after an explosion, they remain hot and pre-detonate the n2o/fuel/air mixture in your cylinder before it's time, sending a piston through your hood. get spark plugs 1-2 steps coler and you solve that problem. 2 - retards who think they know more than the phD engineers at Zex and Nitrous Express, who put different size jets in than what the chart says. Too much nitrous and too little fuel will cause you to detonate - again, pistons go flying. 3 - people spraying where compression would be too high. you can't spray in 4th gear (5th for manuals) because your engine can't climb through the RPMs as easily, so compression builds up way too much, and thats when people blow up their motors.
with a wet kit and most dry set ups, you can spray all night and all day to your hearts content, as long as your air/fuel ratios are correct (wideband readings, no blinkly light show autometer crap) and as long as your compression doesn't get too high.
my bible:http://www.dsmtuners.com/forums/forumdisplay.php?f=11
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