Just wanted to get some feedback on the nitrous explosions/backfires.
Is this cause by hitting it too low. I have noticed that it usually happens with WET KITS. Is there one kit that this happens with more then other? Is it the nitrous or fuel solenoids getting stuck? I always run dry shots but have bought a TNT ring kit and was getting worried with all these videos i have been seeing.. Would hitting my dry kit 150hp down low to get me out of the hole then 150 wet once rolling lessen my chances of this explosion happening?

 

from what i have heard its more likely to hapeen at low rpm. its cos the fuel and air dont have the velocity at lower rpm so you can get puddles (i think). most have a window swtich set for about 3000rpm and above.

also Autos tend to be less prone cos they dont bog down like manuals can do.

have a look on here. http://www.ls1tech.com/forums/forumdisplay.php?f=10

thanks Chris.

 

The ones I have seen were at the drags and were usually because the system was left on in the lanes and somehow the nos was leaking in,maybe a stuck solenoid.It looked like it just blew off the intake or throttle body,but this is rare if set up right.

 

what do u mean by left on? Even if the activation switch is on it shouldn't spray unless the WOT switch is depressed. I know if u leave the bottle open for a longtime it can be hard on the solenoids and cause them to leak..Pls explain more

 

It's typically from hitting it too low-that's why i love a progress kit-plus it wil pay off with along tranny life!

 

I guess i will hit the dry shot at the line and come in with the wet kit on the 2nd stage..Can't wait to see what this will feel like..

 

From my understanding the backfire i believe you are asking about comes from a couple factors.
Usually only hear with a wet kit. Puddling is a big cause of this. Hitting too low of a RPM or having wrong size fuel jets (aka putting to much fuel to be burned with the nitrous). One of the biggest reason is someone who has knipped the plugs on one hit and then the next time the nitrous is applied BOOOM!!!! Can't burn the fuel quick enough cough cough hicup boom! This comes from improper plug gapping, too hot of a heat range plugs, old plugs. I personally liked changing plugs on my LS1 camaro every 3-5 bottles. One of the other reason is a fuel noid sticking open and letting the fuel puddle. Do proper upkeep with fuel, fuel filters, and noid upkeep and sending them in to be checked each year buy the manufacturer IMO. Hope some of this helps. Its late so i couldnt type it all pretty

 

thanks for the info...

 

Here's a little more info for insight.
http://forums.corvetteforum.com/show....php?t=1627170
Robert

 

Mike, nos back fires are caused by a couple of things, first one that is usually always the problem is the bottle pressure is too high. In a result the nos gets to the end of the nozzle before the fuel does and causes this. The other thing is that if you hit the nos at a low rpm you can't have to much timing being pulled out at the time or the engine will not be able to burn the extra fuel you are adding.
The Tnt kit works great they use a large fuel solonoid and have a great nozzle that helps prevent this, to date I have never had a nos back fire with a TNT ring kit or direct port fogger.

 

Not true. The numer one reason is fuel puddling in the intake. That is cuase by too large of a fuel jet or starting the system at too low of an RPM. Either one allows fuel to condense and form puddles in the intake. Poor plugs is also a big contributing factor.

Keith

 

I agree with Keith. I used to run the pressure up untill the bottle almost popped experimenting and no backfires. Hit it around 3500 rpm's

 

The puddling in of itself is not the source of the backfire. Once you have a back fire, the vapor in the intake ignites, then the explosion begins, with any puddled gasoline adding to the ever expanding explosion as fuel for the bang. Remember, liquid gas will not explode, just the vapors.

High bottle pressure can be a contributing canidate in the backfire, if going lean and the resulting detonation, at anywhere during run.

Even at proper pressure and resulting correct a/f, you can get a lean spike from the n2o getting into the intake first. A launching issue.

This makes no sense? Please explain.

For those that say I haven't had a problem with my wet kit/hit, well that doesn't absolve wet style hits from having design problems on our FI cars. I have never been killed by a drunk driver, so it must not be a problem?

Some reasons and things to consider.
Well one of the most common reasons for the intake backfire is the lean spike upon activation, coupled with spraying big and at a lower rpm.
A stuck closed fuel noid, leading to lean out and/or detonation.
A sticky or partialy opening fuel noid.
Detonation leaving a hot spot ie: carbon build up, plug electrode, casting flash; this can leave an ignition source at the wrong time and boom.
A bog launch can also invoke the dreaded back fire.
High over lap cams.
and there are other reasons also, and the main reason I run dry is to void out 97% of these issues.
Robert

 

Thanks for al the good info..Special thanks to Robert56 he always answer my questions..