nitrous help please - BOOM

[Rice Eater]

I'd say you are sparying tooo much even on the stock PCM....stock plugs gotta go! I'd say drop it to 125 or 150 shot, replace your plugs. If you want to go to a bigger shot....get a VECIII so you can PULL some timing out. Be careful when you put the 91 flash back in....I'd assume that timing is advance over stock.

 

[BigRed460]

You can't run back to back to back without letting a Nx motor cool. The valves will get so hot they will glow, and you risk damaging your heads. Nitrous backfires can be caused by two situations. A nitrous system that is two rich or a system that atomizes the fuel poorly, thus causing pooling or puddling of fuel in the intake manifold. Or a system that is operated too lean.
I would say that you got the motor hot, it started to run VERY lean, a cylinder fired earlier than it should have, and ignited the fuel and nx in your intake. Your VERY lucky that your manifold is in one piece. The other cause could have been puddling, check you nozzle placement. If the nozzle is not down in the airway far enough, or has something in front of it (the center of the TB) the fuel will puddle and not atomize properly and cause the motor to run lean with tons of extra fuel in the intake...

 

[AWDisuzu]

this is the answer I was looking for. I'm guessing the back to back runs heated up the valves and caused the nos/fuel mixture to ignite. the throttle body is huge on these trucks, so i think it would be pretty hard to actually blow the intake manifold apart.

It just goes to show, even a k&n drop in filter can provide enough back pressure to blow the airbox up!

~mike~

You can't run back to back to back without letting a Nx motor cool. The valves will get so hot they will glow, and you risk damaging your heads. Nitrous backfires can be caused by two situations. A nitrous system that is two rich or a system that atomizes the fuel poorly, thus causing pooling or puddling of fuel in the intake manifold. A system that is operated too lean.
I would say that you got the motor hot, it started to run VERY lean, a cylinder fired earlier than it should have, and ignited the fuel and nx in your intake. Your VERY lucky that your manifold is in one piece. The other cause could have been puddling, check you nozzle placement. If the nozzle is not down in the airway far enough, or has something in front of it (the center of the TB) the fuel will puddle and not atomize properly and cause the motor to run lean with tons of extra fuel in the intake...

 

[Annu Kumar]

Nitrous can be scary shit, which is why I personally would never consider running it.

Considering what happened, you are damn lucky to still have an engine left. Hell, some lose their entire vehicle due to nitrous back fires.

Glad to hear it was only the air box and a couple wires that you lost.

Hel silverback even if you run just a tiny bit Like (50 shot) is it still That Dangerous:dontknow:

 

[BigRed460]

Nx is non-flammable, Nx used PROPERLY and in small shots is very safe. That being said Nx addicting, it's easy to say "o welll i'll just spray alittle more and beat um next time..." Nitrous in and of itself cannot "blowup" an engine. nitrous kits of poor design, poor quality, and improper air/fuel ratios damage engines...

 

[mosrt10]

Back in the day when I was young and dumb I launched the an edelbrock air cleaner off my Camaro. The engine misfired while I was spraying and I launched it through the air. Should have seen the crowd scatter.

 

[Prof]

You can't run back to back to back without letting a Nx motor cool. The valves will get so hot they will glow, and you risk damaging your heads. Nitrous backfires can be caused by two situations. A nitrous system that is two rich or a system that atomizes the fuel poorly, thus causing pooling or puddling of fuel in the intake manifold. Or a system that is operated too lean.
I would say that you got the motor hot, it started to run VERY lean, a cylinder fired earlier than it should have, and ignited the fuel and nx in your intake. Your VERY lucky that your manifold is in one piece. The other cause could have been puddling, check you nozzle placement. If the nozzle is not down in the airway far enough, or has something in front of it (the center of the TB) the fuel will puddle and not atomize properly and cause the motor to run lean with tons of extra fuel in the intake...

Good stuff, expressed clearly and without rumor or finger pointing...

One of the best responses to a "Spray" issue I have ever seen. I'm learning when people take the time to be clear and concise.

Thank you sir!

 

[HDVIPER]

Is it possible that something else broke too without being able to see it? Just wondering, I hope not. Damn man, that sucks! Sorry to hear about it Mike.

 

[zex-srt10]

Been there done that bro, And it happened in fourth gear going about 115mph. My k&n looked like a big orange. What happened to mine was that the nitrous solenoid went out and it was just spraying fuel, and when i lifted it went kaboom. But i was lucky that night.

 

[JMB Justin]

I would step to one or two steps colder plugs and check all your solenoids to make sure everything is functioning correct as well. I spray a 175 at 3K too, and I know viper guys who spray 300+ at 3K RPM, it just has to be able to consume it quick enough. Best of luck, dont get discouraged.
Justin

 

[Nowwhat]

I would step to one or two steps colder plugs and check all your solenoids to make sure everything is functioning correct as well. I spray a 175 at 3K too, and I know viper guys who spray 300+ at 3K RPM, it just has to be able to consume it quick enough. Best of luck, dont get discouraged.
Justin

I start spraying at 3500....hurts the 60' I am sure....

 

[JMB Justin]

I start spraying at 3500....hurts the 60' I am sure....

Are you ramping it in with the progressive? How much do you start with?
Justin

 

[Rice Eater]

The other cause could have been puddling, check you nozzle placement. If the nozzle is not down in the airway far enough, or has something in front of it (the center of the TB) the fuel will puddle and not atomize properly and cause the motor to run lean with tons of extra fuel in the intake...

I agree with Big Red here.......I wanted to position the nozzel close to the TB.....but using only a single nozzel I didin't want it spraying more into one side of the motor than the other and wanted a little extra room for atomization so I put it up past the first bend in the KN tube. Directions call for 6" up from the TB. It can be done right though close or in the intake manifold if you go the route JMB did.

 

[Nowwhat]

Are you ramping it in with the progressive? How much do you start with?
Justin

yes...on this Sunday the settings are....

at 3500 the spay starts at 60% of the 325 shot....it ramps to 100% in .2 sec

same ramp in 2nd....no ramp just 100% in 3rd...

for the 10.73 run slower ramping

at 3500 spray started after a .1 sec delay..then ramped 60-100% over .4 sec...same for 2nd

gonna be an interesting difference

 

[Nowwhat]

Jusitn....here is a pic of the software....scroll down

http://www.nitrousexpress.com/Pages/Maximizer2.htm

 

[JMB Justin]

yes...on this Sunday the settings are....

at 3500 the spay starts at 60% of the 325 shot....it ramps to 100% in .2 sec

same ramp in 2nd....no ramp just 100% in 3rd...

for the 10.73 run slower ramping

at 3500 spray started after a .1 sec delay..then ramped 60-100% over .4 sec...same for 2nd

gonna be an interesting difference

Id try 325 out of the gate at 2500 RPM, I bet you'd KILL my 60' if you got it to stick!

What does your converter flash to? Just a thought, why dont you start ramping it in small (Im not sure how low you can go though) , like a 50 or so at 2500 and pound it hard by .2-.3 seconds. The small initial hit down low would definitely help to move all that weight. Im guessing you cant even go that low on your progressive with a 325 jetting setup! Hopefully traction will no longer be an issue for you with the new axle and tires. Best of luck Mike!
Justin

 

[Nowwhat]

Id try 325 out of the gate at 2500 RPM, I bet you'd KILL my 60' if you got it to stick!

What does your converter flash to? Just a thought, why dont you start ramping it in small (Im not sure how low you can go though) , like a 50 or so at 2500 and pound it hard by .2-.3 seconds. The small initial hit down low would definitely help to move all that weight. Im guessing you cant even go that low on your progressive with a 325 jetting setup! Hopefully traction will no longer be an issue for you with the new axle and tires. Best of luck Mike!
Justin

correct you can not start below 50% of the shot....veter will only flash to 2700ish...also a problem....but with almost 900ftlbs of trq I will have to just make do.... ..I figure the time between launch and 3500 rpm keeps me from blowing the tires off...:dontknow:

 

[AWDisuzu]

I didn't place the nozzle back any farther (in the bendy section) because I was afraid that the fuel (gas part at least) might end up heavier in the driver's side of the throttle body more so than the passenger side due to inertia.

also, having the entire intake tube full of raw fuel makes for an even more disastrous backfire / explosion (if it were to happen again)

 

[SrtBrad]

I didn't place the nozzle back any farther (in the bendy section) because I was afraid that the fuel (gas part at least) might end up heavier in the driver's side of the throttle body more so than the passenger side due to inertia.

also, having the entire intake tube full of raw fuel makes for an even more disastrous backfire / explosion (if it were to happen again)

Mike do you need any help on Saturday evening to put the CAI on? I'll be working till 6 but can help afterwards.

Brad

 

[VNM PWRD]

Mike do you need any help on Saturday evening to put the CAI on? I'll be working till 6 but can help afterwards.

Brad

Do you need to stop by and pick one up :dontknow: :dontknow: :dontknow: