Lost power during nitrous pass
#16
I just got lost here! The mechanics told you " leak down was good , but it looks you have a valve train related problem"??? One thing cancel the other !!! If the leak down is good , it is impossible you now have a valvetrain related problem or even a broken sleeve!!! Thats crazy.
nOS backfire ussually happends when spraying to early, some claim 3000 rpm wot is the lowest you can go others 2500 rpm wot with a ramping effect on the NOS set up. At what rpm you hit the F with Nos , what plugs you use, how big of a shot ?
nOS backfire ussually happends when spraying to early, some claim 3000 rpm wot is the lowest you can go others 2500 rpm wot with a ramping effect on the NOS set up. At what rpm you hit the F with Nos , what plugs you use, how big of a shot ?
Last edited by KOKISF; 09-17-15 at 09:19 PM.
#17
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From: NC, Formerly CA
I just got lost here! The mechanics told you " leak down was good , but it looks you have a valve train related problem"??? One thing cancel the other !!! If the leak down is good , it is impossible you now have a valvetrain related problem or even a broken sleeve!!! Thats crazy.
nOS backfire ussually happends when spraying to early, some claim 3000 rpm wot is the lowest you can go others 2500 rpm wot with a ramping effect on the NOS set up. At what rpm you hit the F with Nos , what plugs you use, how big of a shot ?
nOS backfire ussually happends when spraying to early, some claim 3000 rpm wot is the lowest you can go others 2500 rpm wot with a ramping effect on the NOS set up. At what rpm you hit the F with Nos , what plugs you use, how big of a shot ?
#19
This is 1 person and 1 issue. There are many of us that have been running nitrous for a few years with no problems at all. Ask around before you are scared off...
#21
My advice would be, don't go cheap. If it cost you more so its done right, this is the only way to go. I paid over $3500 for my setup, worth every penny and wouldn't of paid any less! Wet system with 2x 10lb bottles, progressive controller so I can run it right from WOT. I run it from idle at the light to the end of the track.
#22
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^^Thanks bakewalk! I am relatively new to nitrous but i do understand how it works. I needed a heads up on price plus labor so I know where to begin. Did you change the spark plugs? If you did, which plugs did you get? Also, 91 octane gas is the highest in CA besides race gas that will probably never put in. What size jet would you recommend for 91 octane gas along with replacement sparkplugs (if applicable)?
#23
^^Thanks bakewalk! I am relatively new to nitrous but i do understand how it works. I needed a heads up on price plus labor so I know where to begin. Did you change the spark plugs? If you did, which plugs did you get? Also, 91 octane gas is the highest in CA besides race gas that will probably never put in. What size jet would you recommend for 91 octane gas along with replacement sparkplugs (if applicable)?
I sent you a pm with a whole bunch more info...
#25
Lexus Champion
iTrader: (7)
Hmm, most nitrous backfires involve blowing up the intake manifold. Like seriously. I find it hard to believe that you blew a piston after a nitrous backfire.
Maybe it was running lean? I've only had one nitrous backfire on my Infiniti, and it blew the intake off the throttle body. I was also running a small shot (75)
Maybe it was running lean? I've only had one nitrous backfire on my Infiniti, and it blew the intake off the throttle body. I was also running a small shot (75)
#26
Lexus Champion
iTrader: (7)
Also let me school some guys on how a nitrous backfire happens. It's not from fuel puddling up, well it can be. If you're running too big of a fuel jet, on a SINGLE jet, then yes, fuel can puddle up, but that normally doesn't happen.
1) Ignition timing TOO retarded (we don't have timing control, so I'll skip this, unless someone just wants to know)
2) Lugging the engine.
So if you lug the engine, the engine is spinning slower than the wheels (1:1 ratio, which I believe is our sixth gear?)
So fuel, nitrous, and air are all in the intake manifold, and since the motor is spinning slow, it eventually fills up the intake and has no where to go, so the explosion happens in the intake manifold. Remember what nitrous actually does, it chemically cools down the intake charge, and when it ignites, it becomes a bigger explosion. Which is why nitrous, happens instantaneously. When you look at a dyno chart, the MOMENT some starts spraying, you see a big jump in TQ.
Which is why they tell you not to spray at such a low RPM, because the instant torque can break/bend rods!
So for instance, if you were spraying at a high gear/low RPM, you'll have what's called "reversion" in the intake manifold, and POP! Something's gotta give.
1) Ignition timing TOO retarded (we don't have timing control, so I'll skip this, unless someone just wants to know)
2) Lugging the engine.
So if you lug the engine, the engine is spinning slower than the wheels (1:1 ratio, which I believe is our sixth gear?)
So fuel, nitrous, and air are all in the intake manifold, and since the motor is spinning slow, it eventually fills up the intake and has no where to go, so the explosion happens in the intake manifold. Remember what nitrous actually does, it chemically cools down the intake charge, and when it ignites, it becomes a bigger explosion. Which is why nitrous, happens instantaneously. When you look at a dyno chart, the MOMENT some starts spraying, you see a big jump in TQ.
Which is why they tell you not to spray at such a low RPM, because the instant torque can break/bend rods!
So for instance, if you were spraying at a high gear/low RPM, you'll have what's called "reversion" in the intake manifold, and POP! Something's gotta give.
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