I've been running the zex wet kit on my car for a while now at the 75 shot, until it started acting kinda wierd. So the problem is when I spray the nitrous it goes fast for a while and then bogs real quick a couple times while making a soft poping noise and then BAM!! So I pull over and everything is fine besides the blown up intake pipe and vaporized intake filter splatted all over the place. This has happened a couple of times now and the intakes are starting to add up. This is on a d16y8 with a zex wet kit and 2deg ignition retard and 93 oct. Im using stock plugs but am thinking about buying some NGK BKR7E plugs today and gining it another go. Any thoughts on what could fix this.

 

big badda boom

 

Your intake pipe is blown up?! Like pop'd off?Can you take a picture of your set up?? where you have the nitrious line tied in at. With a 75 shot on that motor you should be running colder plugs and your timing should be at least 1 degree retarded, you may be getting to much advance, that would cause the boging but not in a severe manner it sounds like its not installed properly. Has it been running fine for quite some time??

 

Yeah it ran great for at least 2 months. One other thing to note is the temperature was much colder outside when it stared happeneing (between 45-55deg f). The popping is detonation i assume, but it bogs when it pops is what I'm trying to say. I know for a fact that everything is installed properly .

 

check your lines... your nitrous line could be clogged up. this happenned to me once at the track when i had nitrous... my nitrous solenoid was clogged and only fuel was running into the intake pipe... causing it to bog and die out. as far as your intake exploding?? take some pics, ive heard of intake filters being sucked in but blowing up, i dunno.

 

youre having a nitrous accumulation in your intake. for one reason or another its not all getting into the motor and its igniting in the intake. youre lucky u havent damaged your IM or TB

 

Do you know what your bottle pres. is when you spray? I think you should retard the timing more and lower the gap in the plugs.

 

I have a NOS bottle heater with auto temp turn off thing, but no in car gauge, because they are like $250. Got the new plugs ordered today, should be here tomorow morning.

As for the intake exploding, one intake tube did actually blow up a little bit in the middle. Other than that I had one foam intake filter that vaporized into red goo, and the frame blew up into at least 20 pieces. And about 3 filters that only have the metal mesh left but the filter material burnt away.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B2CivMan &raquo;</TD></TR><TR><TD CLASS="quote">I have a NOS bottle heater with auto temp turn off thing, but no in car gauge, because they are like $250.</TD></TR></TABLE>I'd put one the the bottle itself and check it all the time. Your bottle pressure can be threw the roof if you dont watch it.

 

I had one for a while but sold it cause i never looked at it in the trunk. If memory serves me right it was ~1100 psi the last time i checked with the heat on.

Is it ok to spray in ~20deg f weather or no go on that idea?

 

Exactly, this happend to my buddies civic once. But it isn't the N2O iginting it is the fuel (N2O only provides more oxygen to combust with in the cyclinder, thats why the wet kits have an addition fuel nossel). The fuel, for some reason, is puddleing up in your intake pipe. I guess that its not atomizing all the way. Check to see if your fuel line is restricted at all (maybe a tight bend or something), that could turn your fuel into tiny droplets instead of it being atomized. Good luck man.

 

You're lucky you didn't blow the welds on the intake...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlangBlangTEG-93’ &raquo;</TD></TR><TR><TD CLASS="quote">Exactly, this happend to my buddies civic once. But it isn't the N2O iginting it is the fuel (N2O only provides more oxygen to combust with in the cyclinder, thats why the wet kits have an addition fuel nossel). The fuel, for some reason, is puddleing up in your intake pipe. I guess that its not atomizing all the way. Check to see if your fuel line is restricted at all (maybe a tight bend or something), that could turn your fuel into tiny droplets instead of it being atomized. Good luck man.</TD></TR></TABLE>

exactly

 

how far from the tb is your nozzle. if its 2 far away you will get clouds of nitrous, then clouds of air w/out nitrous, causing the backfiring and bogging. my setup did this one time when my nozzle was 2 far from the tb. i moved it closer and it never happened again. also you can pick up nitrous gauges for around $35. zex, marshall, etc.

 

I have the nozzle where the intake bends before it goes into the tb. Maybe at the bend the air loses velocity and the fuel puddles. I'll get a new pipe and give it a whirl tomorow.

 

normally you want a wet nozzle in the im not in the intake tube

 

You have the jets too close to the TB. They should be atleast 12 inches away.

Also, 1100psi is too high. The very maximum I would go (only by accident) is 1050. Optimum is 950-1000.

Also, you need colder plugs. If it bogs down after a while, that means the spark plugs are turning into glow plugs and predetonating. Predetonation = boom. That was the pinging sound you heard. You are very luck that you don't have a nice sized hole in your block. This is why ALL nitrous companies tell you to upgrade the plugs.

EDIT: Also, the wet kits inject fuel with the nitrous in the intake pipe. Only direct port systems go directly into the IM.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlangBlangTEG-93’ &raquo;</TD></TR><TR><TD CLASS="quote">Exactly, this happend to my buddies civic once. But it isn't the N2O iginting it is the fuel (N2O only provides more oxygen to combust with in the cyclinder, thats why the wet kits have an addition fuel nossel). The fuel, for some reason, is puddleing up in your intake pipe. I guess that its not atomizing all the way. Check to see if your fuel line is restricted at all (maybe a tight bend or something), that could turn your fuel into tiny droplets instead of it being atomized. Good luck man.</TD></TR></TABLE>

this could also be caused by spraying at a low rpm.....Anything below 3800-4000 could be dangerous

 

When I ran NOS and I was hard on the petal and spraying I'd get the same kind of bang from under the hood and noticed nothing wrong but it was still discerning. It happened twice and then I said to heck with it and ripped out the kit and sold it. Only to find it still happened! I found a tear in the spark plug tube that goes into the engine itself. Spark was arching through the tube to the head itself. Maybe check that? Sorry I can't be of better help.
-Rik

 

Its not good to spray in cold weather. I also wouldnt spray it at 1100psi ether. 900-1000 is good.

 

couple questions.

1. i thought it was 3000rpms that you could not spray under? that's what I was always told, and always have sprayed above 3000rpms.

2. how is it not good to spray in cold weather?

 

if you are backfiring thought the intake then either your running lean, spark plugs are too hot or you need new spark plugs. you can spray in any weather it doesn't matter how hot or cold it is. saying you can't spay in 20deg weather is like saying you can boost your motor then either. if you ever are backfiring out the exhaust then your running too rich. just remember when your using NX you'll go through spark plugs pretty quick depending on how much you spray. change out your spark plugs for some colder ones and let me know how it does. and yes they say not to spray under 3K.

 

Actually, you shouldnt spray below peak torque but who listens to that? I never spray below 3500 just because I dont want the huge torque spike to ruin my tranny.

 

Changed the plugs out, and put the 55 shot nozzels back in, used 5lbs so far so good! I might just keep it at the 55 for a while. The clutch started slipping tonight so I guess so I guess it's time for an upgrade