Nitrous Backfire
Nitrous Backfire I made 4 runs today on spray. 3 of them off a dig..and spraying outta the hole..All went find. I was running a buddy of mine in his Saleen E and i sprayed on a roll in 2nd gear at about 3200rpms. Mad a little pop, puff of smoke and the car started to bog down. I immediatly killed the motor, pulled over and popped the hood. I have a K&N FIPK..the air filter is pretty much mangled. When i popped the hood. the filter, MAF, and the bellows were blown off the throttle body. The nitrous nozzle was blow outta the bellows as well. When i turn the key to the on position..i only get about 40psi of fuel...if i crank it over..the motor turns over but then the rpms instantly skyrocket to like 5grand and just hold there. Im hoping i didnt do to much damage. Any info would be helpful!!!
yea i turned it on, and it did exactly what it should of with an intake leak. Its not like i let it run or anything lol. Im thinking a LS6 intake with nitro daves plate system will take care of this issue.
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Id say go Fast90 with a burst panel. Then you only have to replace the panel when it goes pop again, its bound to with the wet. Just go dry man. Its been proven plenty reliable. Just tune for that ****.
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. That's why there's pieces of your intake missing. 
Yeah and you will have to replace you MAF as well. I know you knew that already. It happend to me and it took me two days and some nerve pills to finally get the relief that it was only a MAF and lid that I damaged. Good luck.
TECH Resident
Joined: Jul 2007
Posts: 775
Likes: 1
From: dekalb, IL
Originally Posted by 99Ws6TransAm
150 wet. This happened right away as well. It popped right when it sprayed. So it wasnt like i was in it..spraying..then pop. Right as i hit the gas.
that is why it was instantaneous
btw i am not an expert but that seems to be the case I think
also BTW first post!!!!!
Guest
Posts: n/a
Originally Posted by Brentman2007
the reason it popped right away is probebly because the fuel and or fuemes were lingering in the itake from the last spray and just when your throttle body opened somehow a connection of firing with no vaccume caused it to blow off your intake
there is no way you can have fuel vapors "lingering" in the intake while the vehicle is running.
To be able to help diagnose what went wrong we need to know a few things
1) What was your A/F?
2) What was the fuel pressure, do you have a fpss?
3) Do you have a window switch?
4) What are you using for activation?
It sounds to me like you either had a lean condition or lugged the motor in the roll race.
TECH Resident
Joined: Jul 2007
Posts: 775
Likes: 1
From: dekalb, IL
Originally Posted by Ray@Nitrous Outlet
there is no way you can have fuel vapors "lingering" in the intake while the vehicle is running.
To be able to help diagnose what went wrong we need to know a few things
1) What was your A/F?
2) What was the fuel pressure, do you have a fpss?
3) Do you have a window switch?
4) What are you using for activation?
It sounds to me like you either had a lean condition or lugged the motor in the roll race.
To be able to help diagnose what went wrong we need to know a few things
1) What was your A/F?
2) What was the fuel pressure, do you have a fpss?
3) Do you have a window switch?
4) What are you using for activation?
It sounds to me like you either had a lean condition or lugged the motor in the roll race.
ok that was just my guess...i just figured he had hit it at too low of rpm or while the throttle body was not all the way open 
Originally Posted by Ray@Nitrous Outlet
there is no way you can have fuel vapors "lingering" in the intake while the vehicle is running.
To be able to help diagnose what went wrong we need to know a few things
1) What was your A/F?
2) What was the fuel pressure, do you have a fpss?
3) Do you have a window switch?
4) What are you using for activation?
It sounds to me like you either had a lean condition or lugged the motor in the roll race.
To be able to help diagnose what went wrong we need to know a few things
1) What was your A/F?
2) What was the fuel pressure, do you have a fpss?
3) Do you have a window switch?
4) What are you using for activation?
It sounds to me like you either had a lean condition or lugged the motor in the roll race.
What do you mean lugged the motor? Fuel pressure was around 50psi i would say. FPSS is installed. Window switch was set at 3300 rpms..hit the throttle at around 3000rpms. Activation is a WOT switch mounted on the TB.
Guest
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Originally Posted by 99Ws6TransAm
What do you mean lugged the motor? Fuel pressure was around 50psi i would say. FPSS is installed. Window switch was set at 3300 rpms..hit the throttle at around 3000rpms. Activation is a WOT switch mounted on the TB.
for example, a T56 car is cruising at 3000RPM in 6th gear and goes wide open throttle it will not increase in RPM as fast as WOT in First gear at 3000rpm
When the kit is activated the motor must be able to build RPM fast enough to not allow the intake to "load up".
A backfire is caused by igniting the mixture in the cylinder with the exhaust valve open...unless you have another ignition source...this ignites all of the fuel from the cylinder to the nozzle/plate.
Since you had a window switch it sounds like either a lean condition/detonation or ignition misfire that caused the backfire.
What was the A/F on the car....and did you verify the jetting provided the correct AF.
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Originally Posted by Shoulder Shaker
Well something like that happen on a Direct Port Kit?
I'm talking about the fuel puddling like I hear some people say about the wet kit.
I'm talking about the fuel puddling like I hear some people say about the wet kit.
Fuel puddling with a properly installed/operated system is almost non existent
As long as the A/F is correct the fuel will be atomized to the point that it will not have time to seperate from the airflow before being pulled into the cylinder.