nitrous, wet vs. dry
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
nitrous, wet vs. dry
Could I get some opinions as to the advantages and disadvantages of each? Oh, and please dont tell me to post in the FI section as I already did 1 week ago. http://forums.corvetteforum.com/show....php?t=1466621
Thanks in advance
Thanks in advance
Melting Slicks
Joined: Nov 2000
Posts: 2,469
Likes: 6
From: Winchester Ontario
With dry system, you need to upsize your injectors. Dry nitrous sprays into the intake ducting before the maf and your computer "senses" this and adjusts fuel accordingly. If you ever had a "hiccup" or problem with your computer for whatever reason, your engine is now toast.
Wet system, the nitrous and fuel are jetted at the same time in the exact proportions needed. No need to upsize injectors here. This is a much safer system to use in my opinion. This is most commonly a plate system with nozzles sticking out of the plate and some braided nitrous / fuel lines to solenoids which will pulse the two.
As with everything, before using make sure your engine is in a somewhat healthy state as is your fuel delivery system.
They also recommend using a plug that is one heat range colder for nitrous.
I'm sure there is a lot more info on the board but that is a start.
Wet system, the nitrous and fuel are jetted at the same time in the exact proportions needed. No need to upsize injectors here. This is a much safer system to use in my opinion. This is most commonly a plate system with nozzles sticking out of the plate and some braided nitrous / fuel lines to solenoids which will pulse the two.
As with everything, before using make sure your engine is in a somewhat healthy state as is your fuel delivery system.
They also recommend using a plug that is one heat range colder for nitrous.
I'm sure there is a lot more info on the board but that is a start.
Team Owner
Joined: Sep 2001
Posts: 62,153
Likes: 1,731
From: Athens AL
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Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,713
Likes: 105
From: Manassas VA
Thanks for all the input on this. The kit I was looking at is here http://www.zex.com/ then go to 82018 for the model. This is a little different in it uses something similar to a FMU. When nitrous is injected, it increases the gas pressure at the regulator, and I heard by as much as an additional 50 lbs, to add the fuel. I am really concerned with the thought of running 92 lbs of pressure on the injectors. Also, it comes with a booster pump for the fuel. One nice thing about the kit is it does not use a seperate wot switch. You tie a wire to the TPS and go into a program mode, hold throttle wide open for 10 seconds and then it sets to see that voltage to activate the nitrous.
In addition they speak of dry being better on a efi car due to the manifold not being designed for fuel.
It seems that there are advantages and disadvantages to both, but I am leaning towards the wet being more safe.
In addition they speak of dry being better on a efi car due to the manifold not being designed for fuel.
It seems that there are advantages and disadvantages to both, but I am leaning towards the wet being more safe.
Pro
Joined: Sep 2000
Posts: 599
Likes: 0
From: Tampa,FL
I'm right there with ya. Have been looking at the zex for a while as well. I feel it's like this..If your going to run UNDER a 100hp shot then the dry kit should be just fine. Excess of 100Hp..wet kit. If you even THINK you will want to go higher then 100..wet kit. As far as which is safer, the opinions vary greatly and they all make good points. Just have to weight the pros and cons....good luck 
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Melting Slicks
Joined: Oct 2003
Posts: 2,951
Likes: 3
From: Mount Vernon OH
Lots of options for nitrous
I like the dry kits for the lower power levels and the port systems for the bigger power levels. Plates are ok but the port systems are really hard to beat because of the superior distribution. I have not experiemented with the NOS Nozzle system but I like it conceptionally. I have found that wet systems are generally safer when you are turning up the juice.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
"the manifold not being designed for fuel".
I will be running wet but have read on other Forums of distribution problems on our manifolds where the mix can not make the sharp turn into the front ports resulting in a rich at rear , lean at front situation
I will be running wet but have read on other Forums of distribution problems on our manifolds where the mix can not make the sharp turn into the front ports resulting in a rich at rear , lean at front situation
Melting Slicks
Joined: Oct 2003
Posts: 2,951
Likes: 3
From: Mount Vernon OH
Originally Posted by rodj
"the manifold not being designed for fuel".
I will be running wet but have read on other Forums of distribution problems on our manifolds where the mix can not make the sharp turn into the front ports resulting in a rich at rear , lean at front situation
I will be running wet but have read on other Forums of distribution problems on our manifolds where the mix can not make the sharp turn into the front ports resulting in a rich at rear , lean at front situation
Drifting
Joined: Aug 2001
Posts: 1,500
Likes: 0
From: Holliston MA
Cruise-In VII Veteran
A 100 hp nitrous shot needs ~50 lbs/hr of additional fuel. A set of (8) 24 lb/hr injectors at 43 psi will need to be increased to ~70 psi to provide the additional fuel. Delphi injectors get a little iffy at 70 psi. Bosch injectors won't have a problem.
My personal experience with dry nitrous using FAST aftermarket computers for engine management is that dry is the way to go. In richer N/F ratios the dry runs much crisper and cleaner than wet. Fuel distribution is one of the major causes of problems when using nitrous and in a dry system the fuel is there for every runner. The nitrous fills the plenum and is distributed as evenly as the regular non-nitrous enriched atmosphere.
I like dry systems.
My personal experience with dry nitrous using FAST aftermarket computers for engine management is that dry is the way to go. In richer N/F ratios the dry runs much crisper and cleaner than wet. Fuel distribution is one of the major causes of problems when using nitrous and in a dry system the fuel is there for every runner. The nitrous fills the plenum and is distributed as evenly as the regular non-nitrous enriched atmosphere.
I like dry systems.