sleeping stallion

what is meant by when the car misfires using nitrous. what things break or blow

2000GT4.6

I think your thinking of a nitrous "backfire". This happens when fuel puddles in the intake manifold instead of getting down into the combustion chambers. The fuel ignites and then blows the hell out of the plastic intake... usualy into several peices. this happens alot to people without a window switch, they spray at too low a RPM and kaboom.

"misfire" is when a cylinder either doens't fire at all or fires at the incorrect time. This wouldn't be good on nitrous, but its either a plug/ignition or timing issue, nothing to do with the nitrous itself.

stangracer04

I thought a backfire was when you spray at too high of a RPM and you hit the rev limiter. Not saying im right just wondering.

2000GT4.6

Any time that fuel pools into the intake manifold and then ignites its a nitrous backfire.

It can happen from multiple things, but if you hit the limiter what happens is the car will cut the fuel injectors, but the nitrous will keep spraying. This causes the car to instantly go lean, and more often than not you get a nice hole in a piston and your shortblock sprays all over the place.

Generally speaking, you shouldn't get a "backfire" hitting the limiter because its a bottom end explosion, not a pooling of fuel.

There is a great vid of this out there somewhere on a 96-01 cobra... the entire intake blows apart because he sprayed at like 2000 RPM while on the dyno under load... oops!

sleeping stallion

ok well i was racing a stock ws6 that night my very first night using nitrous, and i was at about 60 or so then hit the gas pedal to the floor, then spray with my button, and when itwent to switch gears i heard like it redlined then got into gear. im auto. so i didnt let go but my car ran like a champ the rest of the night one tme i thought i blew up my engine i sprayed right off the line and my car sounds like if my trac control was on or off when it doesn let u burn tire, so i let go instantly. any clues on why it sounded like it redlined. i got a diablo tuner so i can adjust my shifts but dont no to what.

2000GT4.6

It sounds like your running around with the nitrous "on a button" like in the fast and the furious?

I hope your using a RPM switch, fuel pressure switch, WOT switch,etc etc.. otherwise your just asking to blow it up.

stangracer04

200GT4.6 thanks for clearing up the nitrous backfire i had it flipped in my head i guess. So what part of the power band would you spray at to keep it from pooling and avouid hitting the limiter (if you dont have a window switch)?

sleeping stallion

no i dont have any kinda switch just the arm and the spray i try to spray anytime after 2500 at full throttle or 3000 is that safe or what can i do

livefast1

if i were you being auto i would switch to a window switch and set it to 2800-3000 to about 200 rpms below your shift point.

Sxynerd

Pooling fuel on the the spark/ignition/stroke while your intake valves are still open and Bang! byebye intake