100hp dry
4th Gear
Joined: Jan 2012
Posts: 4
Likes: 0
From: Yadkinville NC
I am new to this nitrous stuff. I think I understand the difference between a wet shot and dry shot, somebody correct me if I'm wrong. A wet shot is mixed with the fuel prior to entering the combusting chamber and a dry shot is simply sprayed directly in the intake??? Secondly can you clarify on "retuning" once either system is installed as far as what has to be adjusted and how to adjust it... Thx so much for any info!!!
Drifting
Joined: Aug 2006
Posts: 1,807
Likes: 4
From: Whitby
GarrettDavid, your correct but both systems mix the fuel with air and nitrous in the intake manafold or intake runners on the heads. A dry system relies on the car's fuel injectors to deliver the extra fuel to match the supplied N2O whereas a wet system has a second solenoid for fuel.
A small wet system may not need a retune because the computer is not adding extra fuel for the N2O but it would be recommended to pull a few degress of timing out.
A dry system defenitaly needs a retune due to adding fuel and pulling spark.
A small wet system may not need a retune because the computer is not adding extra fuel for the N2O but it would be recommended to pull a few degress of timing out.
A dry system defenitaly needs a retune due to adding fuel and pulling spark.
Last edited by use2bl8; Feb 8, 2012 at 12:10 PM.
Thread Starter
Racer
Joined: Aug 2009
Posts: 275
Likes: 0
From: PEORIA IL
GarrettDavid, your correct but both systems mix the fuel with air and nitrous in the intake manafold or intake runners on the heads. A dry system relies on the car's fuel injectors to deliver the extra fuel to match the supplied N2O whereas a wet system has a second solenoid for fuel.
A small wet system may not need a retune because the computer is not adding extra fuel for the N2O but it would be recommended to pull a few degress of timing out.
A dry system defenitaly needs a retune due to adding fuel and pulling spark.
A small wet system may not need a retune because the computer is not adding extra fuel for the N2O but it would be recommended to pull a few degress of timing out.
A dry system defenitaly needs a retune due to adding fuel and pulling spark.
Shoot.
Burning Brakes
Joined: Aug 2010
Posts: 918
Likes: 47
From: Northborough MA
The MAF would be able to read the extra air, and adjust fueling according to PE table. If the MAF scaling isn't correct at the higher than NA airflow levels, then you would have a problem, and hence why guys are advocating the re-tune. (This is obviously with the N2O being injected ahead of the MAF, if it is behind it, then the pcm would be blind to the extra air mass coming in.)
Generally on 100hp shots and below, you shouldn't need to adjust timing, unless you have it really aggressive. SO with a given wet shot, you should only need to adjust the fueling to nitrous ratios and be done with it. The one minus of the wetshot is that it is being injected into a manifold that was never intended for a liquid, and could cause some uneven fuel distribution or puddling. With the dry shot you have builtin failsafes in the fueling, and MAF limp modes.
Generally on 100hp shots and below, you shouldn't need to adjust timing, unless you have it really aggressive. SO with a given wet shot, you should only need to adjust the fueling to nitrous ratios and be done with it. The one minus of the wetshot is that it is being injected into a manifold that was never intended for a liquid, and could cause some uneven fuel distribution or puddling. With the dry shot you have builtin failsafes in the fueling, and MAF limp modes.
