NX Nitrous Backfire *Please Help*
Thread Starter
Teching In
Joined: Sep 2004
Posts: 2
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NX Nitrous Backfire *Please Help* had my first backfire in 2 years of nitrous use yesterday...i almost had a heart attack. i have some questions about it if anyone has any info please let me know.
some backround info:
NX 125wet shot
intake fogger setup (not direct port)
psi @ 1040
3.5 v6, 5 speed automatic tranny (no flaming please)
i sprayed in manual mode in 4th gear @ 70mph and just under 4k rpms.
aftermarket cold air intake installed
2 step colder denso irridium plugs
no window switch installed (although i dont think that was the problem since i was nowhere near bouncing off of the rev limiter.
just installed a hawker oddessy battery to cut down on weight
i usually use 93 octane fuel (91 recommended in the manual) when im spraying but a friend of mine borrowed my car 2 weeks ago and put a few bucks worth of 87 octane.
after the incident:
car shut off when i pulled over due to a flooded intake. wet spots of gas all over the inside of the intake
inside of intake was charred black
filter swelled up like a marshmellow
intake hosing did pop off of the intake pipe due to the explosion
questions:
1. what can something like this do to my engine if it hasnt done it yet?
2. what caused this backfire?
3. what should i look for as a possible cause? (nitrous and fuel seleniods seem fine)
4. can a hot intake pipe cause the fuel to ignite?
5. could my new mini battery have caused a power drain resulting in the backfire?
6. could there of been some leftovers of the 87 octane still in my tank which caused the backfire when it touched the hot intake pipe?
7. is my car trying to tell me something?
i seriously appreciate all the help i can get. thanks in advance.
some backround info:
NX 125wet shot
intake fogger setup (not direct port)
psi @ 1040
3.5 v6, 5 speed automatic tranny (no flaming please)
i sprayed in manual mode in 4th gear @ 70mph and just under 4k rpms.
aftermarket cold air intake installed
2 step colder denso irridium plugs
no window switch installed (although i dont think that was the problem since i was nowhere near bouncing off of the rev limiter.
just installed a hawker oddessy battery to cut down on weight
i usually use 93 octane fuel (91 recommended in the manual) when im spraying but a friend of mine borrowed my car 2 weeks ago and put a few bucks worth of 87 octane.
after the incident:
car shut off when i pulled over due to a flooded intake. wet spots of gas all over the inside of the intake
inside of intake was charred black
filter swelled up like a marshmellow
intake hosing did pop off of the intake pipe due to the explosion
questions:
1. what can something like this do to my engine if it hasnt done it yet?
2. what caused this backfire?
3. what should i look for as a possible cause? (nitrous and fuel seleniods seem fine)
4. can a hot intake pipe cause the fuel to ignite?
5. could my new mini battery have caused a power drain resulting in the backfire?
6. could there of been some leftovers of the 87 octane still in my tank which caused the backfire when it touched the hot intake pipe?
7. is my car trying to tell me something?
i seriously appreciate all the help i can get. thanks in advance.
On The Tree
Joined: Nov 2001
Posts: 164
Likes: 0
From: Lewisville, TX
The only N2O backfires I have witnessed was when a car went lean. On one car the fuel pill got clogged and went boom, the other had too high of bottle pressure on their wet kit and the car did not like that.
That is a tough one.
One thing that will cause a backfire is bad intake valves or intake valve springs. This will usually cause a backfire at high RPM's. If the valve dosen't close all the way or in time it can light off all the gas and nit in the intake.
Since your backfire was below 4K, it it probably wasn't the valves, but I've never seen a backfire in that RPM range.
One thing that will cause a backfire is bad intake valves or intake valve springs. This will usually cause a backfire at high RPM's. If the valve dosen't close all the way or in time it can light off all the gas and nit in the intake.
Since your backfire was below 4K, it it probably wasn't the valves, but I've never seen a backfire in that RPM range.
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From: Wichita Falls, TX
I have a few questions.
Was the bottle full?
4th gear spray?
I have a couple of things that could have caused this.
The first no nitrous way way rich (not likely but has happened) The other is more likely if the bottle was full and opened. The motor got logged. What this means is even though you were above 3k you were in 4th gear. You are asking alot of the engine in this state. You are no were near the torque band. Its just like trying to launch a car in 3rd gear, the car will not move and just goes blaaaaa. Give me call on Monday to talk about each little point.Ricky
1. what can something like this do to my engine if it hasnt done it yet? BLow all the vacuum lines off.
4. can a hot intake pipe cause the fuel to ignite? NO
5. could my new mini battery have caused a power drain resulting in the backfire? NO
6. could there of been some leftovers of the 87 octane still in my tank which caused the backfire when it touched the hot intake pipe? NO
7. is my car trying to tell me something? maybe
Was the bottle full?
4th gear spray?
I have a couple of things that could have caused this.
The first no nitrous way way rich (not likely but has happened) The other is more likely if the bottle was full and opened. The motor got logged. What this means is even though you were above 3k you were in 4th gear. You are asking alot of the engine in this state. You are no were near the torque band. Its just like trying to launch a car in 3rd gear, the car will not move and just goes blaaaaa. Give me call on Monday to talk about each little point.Ricky
1. what can something like this do to my engine if it hasnt done it yet? BLow all the vacuum lines off.
4. can a hot intake pipe cause the fuel to ignite? NO
5. could my new mini battery have caused a power drain resulting in the backfire? NO
6. could there of been some leftovers of the 87 octane still in my tank which caused the backfire when it touched the hot intake pipe? NO
7. is my car trying to tell me something? maybe
Originally Posted by N35003
had my first backfire in 2 years of nitrous use yesterday...i almost had a heart attack. i have some questions about it if anyone has any info please let me know.
some backround info:
NX 125wet shot
intake fogger setup (not direct port)
psi @ 1040
3.5 v6, 5 speed automatic tranny (no flaming please)
i sprayed in manual mode in 4th gear @ 70mph and just under 4k rpms.
aftermarket cold air intake installed
2 step colder denso irridium plugs
no window switch installed (although i dont think that was the problem since i was nowhere near bouncing off of the rev limiter.
just installed a hawker oddessy battery to cut down on weight
i usually use 93 octane fuel (91 recommended in the manual) when im spraying but a friend of mine borrowed my car 2 weeks ago and put a few bucks worth of 87 octane.
after the incident:
car shut off when i pulled over due to a flooded intake. wet spots of gas all over the inside of the intake
inside of intake was charred black
filter swelled up like a marshmellow
intake hosing did pop off of the intake pipe due to the explosion
questions:
1. what can something like this do to my engine if it hasnt done it yet?
2. what caused this backfire?
3. what should i look for as a possible cause? (nitrous and fuel seleniods seem fine)
4. can a hot intake pipe cause the fuel to ignite?
5. could my new mini battery have caused a power drain resulting in the backfire?
6. could there of been some leftovers of the 87 octane still in my tank which caused the backfire when it touched the hot intake pipe?
7. is my car trying to tell me something?
i seriously appreciate all the help i can get. thanks in advance.
some backround info:
NX 125wet shot
intake fogger setup (not direct port)
psi @ 1040
3.5 v6, 5 speed automatic tranny (no flaming please)
i sprayed in manual mode in 4th gear @ 70mph and just under 4k rpms.
aftermarket cold air intake installed
2 step colder denso irridium plugs
no window switch installed (although i dont think that was the problem since i was nowhere near bouncing off of the rev limiter.
just installed a hawker oddessy battery to cut down on weight
i usually use 93 octane fuel (91 recommended in the manual) when im spraying but a friend of mine borrowed my car 2 weeks ago and put a few bucks worth of 87 octane.
after the incident:
car shut off when i pulled over due to a flooded intake. wet spots of gas all over the inside of the intake
inside of intake was charred black
filter swelled up like a marshmellow
intake hosing did pop off of the intake pipe due to the explosion
questions:
1. what can something like this do to my engine if it hasnt done it yet?
2. what caused this backfire?
3. what should i look for as a possible cause? (nitrous and fuel seleniods seem fine)
4. can a hot intake pipe cause the fuel to ignite?
5. could my new mini battery have caused a power drain resulting in the backfire?
6. could there of been some leftovers of the 87 octane still in my tank which caused the backfire when it touched the hot intake pipe?
7. is my car trying to tell me something?
i seriously appreciate all the help i can get. thanks in advance.
Thread Starter
Teching In
Joined: Sep 2004
Posts: 2
Likes: 0
i seriously appreiciate all the input im getting from everyone.
answers to NXRICKY's questions: the bottle is about 80-85 percent full. i've only ran it once since filling it. what i meant by 4th gear spray was, i was already driving on the freeway at about 70 mph and in 4th gear when i went WOT and activated the system. i do get into 4th gear when im at the dragstrip (5 speed auto but i was using manual mode), and i've used the freeway to test out my car at lower shots before without a problem but not at this high of a shot.
NXRICKY, im guessing you work for nitrous express? if so, ill be giving you a call monday for sure. i already called nx about this issue (i dont remember who i talked to) and i was told that it "could" have been a very lean condition but we didnt get into too many details. i dont think lean conditions cause backfires though but instead just throw parts of your motor out the side of the block. is that thinking wrong?
thanks again.
answers to NXRICKY's questions: the bottle is about 80-85 percent full. i've only ran it once since filling it. what i meant by 4th gear spray was, i was already driving on the freeway at about 70 mph and in 4th gear when i went WOT and activated the system. i do get into 4th gear when im at the dragstrip (5 speed auto but i was using manual mode), and i've used the freeway to test out my car at lower shots before without a problem but not at this high of a shot.
NXRICKY, im guessing you work for nitrous express? if so, ill be giving you a call monday for sure. i already called nx about this issue (i dont remember who i talked to) and i was told that it "could" have been a very lean condition but we didnt get into too many details. i dont think lean conditions cause backfires though but instead just throw parts of your motor out the side of the block. is that thinking wrong?
thanks again.
Originally Posted by NXRICKY
I have a few questions.
Was the bottle full?
4th gear spray?
I have a couple of things that could have caused this.
The first no nitrous way way rich (not likely but has happened) The other is more likely if the bottle was full and opened. The motor got logged. What this means is even though you were above 3k you were in 4th gear. You are asking alot of the engine in this state. You are no were near the torque band. Its just like trying to launch a car in 3rd gear, the car will not move and just goes blaaaaa. Give me call on Monday to talk about each little point.Ricky
1. what can something like this do to my engine if it hasnt done it yet? BLow all the vacuum lines off.
4. can a hot intake pipe cause the fuel to ignite? NO
5. could my new mini battery have caused a power drain resulting in the backfire? NO
6. could there of been some leftovers of the 87 octane still in my tank which caused the backfire when it touched the hot intake pipe? NO
7. is my car trying to tell me something? maybe
Was the bottle full?
4th gear spray?
I have a couple of things that could have caused this.
The first no nitrous way way rich (not likely but has happened) The other is more likely if the bottle was full and opened. The motor got logged. What this means is even though you were above 3k you were in 4th gear. You are asking alot of the engine in this state. You are no were near the torque band. Its just like trying to launch a car in 3rd gear, the car will not move and just goes blaaaaa. Give me call on Monday to talk about each little point.Ricky
1. what can something like this do to my engine if it hasnt done it yet? BLow all the vacuum lines off.
4. can a hot intake pipe cause the fuel to ignite? NO
5. could my new mini battery have caused a power drain resulting in the backfire? NO
6. could there of been some leftovers of the 87 octane still in my tank which caused the backfire when it touched the hot intake pipe? NO
7. is my car trying to tell me something? maybe
On The Tree
Joined: Nov 2001
Posts: 164
Likes: 0
From: Lewisville, TX
Originally Posted by N35003
NXRICKY, im guessing you work for nitrous express? if so, ill be giving you a call monday for sure. i already called nx about this issue (i dont remember who i talked to) and i was told that it "could" have been a very lean condition but we didnt get into too many details. i dont think lean conditions cause backfires though but instead just throw parts of your motor out the side of the block. is that thinking wrong?
thanks again.
The backfires I saw both blew holes in the intake...
