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20:26:37 - 12/26/2024
Dakota Performance
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DaPurpleRT
Dodge Dakota
JOIN HERE
11/20/2002
22:32:00
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 Subject: Nitrous: Why is wetter better?
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OK, been discussing this with a fellow Dakker and would like some more input. Now, my friends tell me that dry is safer and more effective, and I tell them wet is better for our trucks. Now, I BELIEVE the reason for this is because our intake manifolds are wet.
Is this accurate? Any more info?
Thanks, Ryan
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CW
GenIII
11/20/2002
23:11:29
|  RE: Nitrous: Why is wetter better?
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Message:
Nitrous is one part nitrogen 2 parts Oxygen. Adding all that oxygen you have to add some more fuel at some point or the mixture will go lean. Resulting in a blow torch like effect on your pistons. I think a 50hp shot of dry is the max.
4.7 HO, CW style
2001 4.7 5sp 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" Z-tube, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams, Robert shaw 180 therm, HO intake manifold.
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brianman
Dodge Dakota
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11/21/2002
00:54:26
|  RE: Nitrous: Why is wetter better?
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you have to watch to a certain degree the magnum motors intakes are of a "dry" design meaning that fuel is metered directly to intake ports, allowing for an intake that is purely designed for air delivery making for an efficient package. when using nitrous you will have to add extra fuel to help burn all the oxygen in the cylinders effectively without going lean and burning pistons. to get to the point extra fuel has to be entered some where in the intake, if it is entered just before or just after the throttle body poor fuel distribution will occur, because the intake was never designed for it. small shots of nitrous are ok because not much fuel is needed beyond what the injectors provide. when using big 100 horse shots and beyond port mounted nitrous and fuel induction is a must for optimum power and efficiency
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Texas Todd
Dodge Dakota
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11/21/2002
09:57:29
| RE: Nitrous: Why is wetter better?
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Message:
I understand the need for extra fuel with nitrous, or your engine will suffer severly.
I've got the 4.7, MPI, and you say:
"to get to the point extra fuel has to be entered some where in the intake, if it is entered just before or just after the throttle body poor fuel distribution will occur, because the intake was never designed for it."
I thought others had a wet shot of nitrous, and had the extra fuel selenoid in the air intake, before the TB. Are you saying this doesn't work well? I'd just like to know as I may be running nitrous one day.
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POWER HUNGRY
Dodge Dakota
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11/21/2002
12:32:59
| RE: Nitrous: Why is wetter better?
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Message:
A dry shot kit should have a better a/f ratio than the wet(plate type) system. The problem is that the dry systems are limited by the size of your injectors, since that is where the extra fuel is being added. Large dry shots would require larger injectors that could cause you trouble when not on the shot(rich low-end). Above 150hp, I think the best kit would be the individual runner fogger kits. Also those kits come with a larger available/tuneable power settings. IMO A dry kit should be better up to around 100-125 than the wet kits for a daily driven.
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brianman
Dodge Dakota
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11/21/2002
23:09:59
| RE: Nitrous: Why is wetter better?
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Message:
what i am saying is that entering too much fuel into an intake that is not designed for it is a poor way to utilize a nitrous system. dont go with bigger injectors, sure the fuel enters the air stream at the right point but as injector size goes up so does very poor fuel atomization.
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Lemmers
Dodge Dakota
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11/21/2002
23:11:29
| RE: Nitrous: Why is wetter better?
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Message:
I run a dry nos kit on my 5.0 mustang. It
injects nitrous through a fan spray nozzle right
in front of the throttle body. Extra fuel (when
spraying) is handled by the stock injectors via
the fuel pressure regulator.
Extra fuel needs to be injected any time the
nitrous is, even with a "dry" kit. A wet kit sprays
nitrous and fuel through the intake.
Hope this helps,
Lemmers
02 Quad Sport Plus, 4.7 5spd 3.55lsd,
dropped, tinted, destickered, rt wheels and
toyos, access tonneau
88 LX 5.0 12.7@107 w/75horse dry shot
100,000 HARD miles
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Texas Todd
Dodge Dakota
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11/22/2002
09:38:52
|  RE: Nitrous: Why is wetter better?
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Message:
Lemmers,
Is this x-tra fuel of your 'dry' shot handled by the stock injectors, and the computer, or is there a way to increase it other than and onboard PCM doing it?
Sorry, I'm kinda nitrous illiterate.
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litlpunisher
GenIII
11/22/2002
13:55:40
| RE: Nitrous: Why is wetter better?
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Message:
Dry systems work put I would not recommend one for big shots of nitrous. Dry systems rely on the fuel system of the motor, remember if you air to fuel ratio is good all moteor then when you spray nitrous you lean it out so you need a fuel regulator to sense this and up the fuel to the motor, but what if you fuel system is already maxed out all motor aan you can't dump more fuel BOOOOM!! Wet systems are made to make the right mixture of fuel nitrous right at the plate or fogger. So you won't lean out unless you motor is not running correctly before spraying.
98 Dakota
Bottle fed 340ci
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Texas Todd
Dodge Dakota
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11/22/2002
16:03:30
|  RE: Nitrous: Why is wetter better?
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Message:
Litlp,
This much I understood years ago. MY question was:
will the stock system handle enriching a small to med shot of nitrous by itself, w/o the added fuel dump? ON the 4.7 system, will it enrich a 75hp shot for instance w/o other fuel delivery mods?
01, QC, 4.7, 5spd, HO cams, ported over 68mmTB, no viscouos belt clutch/fan, etc.
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Lemmers
Dodge Dakota
JOIN HERE
11/22/2002
23:21:26
| RE: Nitrous: Why is wetter better?
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Message:
Todd,
I'm not sure exactly how the dry systems
operate on the 4.7, although I'm curious
myself. If they spray enough nitrous for a 75
horse boost, they HAVE to inject fuel or the
pistons would never handle it. It would lean
out and start burning holes in the pistons.
As far as the kit on my 5.0 goes, there's a type
of diaphram unit conected to the nitrous line
that tells the stock fuel pressure regulator to
increase the amout of fuel. It essentially ups
the fuel pressure so the stock fuel injectors
spray at a 100% duty cycle, which is a higher
pressure and duty cycle than "normal/no
nitrous" wide open throttle. All the extra fuel is
supplied by the stock 19lb. fuel injectors.
I know it's kind of a poor explanation, but the
system works flawlessly. Keep in mind the
system I'm using is/was designed specifically
for 5.0 mustangs and is manufactured by
NOS. I haven't researched any kits for my
Dakota but have thought about it.
For the record, there's nothing (well almost
nothing) better than powershifting third
(mustang T-5 only, don't try it with a NV3500)
and hearing the back tires just screaming
trying to hook......
Hope this helps,
Lemmers
02 Quad Sport Plus, 4.7, 5spd, 3.55lsd,
dropped, tinted, destickered, rt wheels and
toyos, access tonneau
88 LX 5.0 12.7@107 w/75horse dry shot
100,000 HARD miles!
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