Anyone using NOS?
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Elder User
Joined: Apr 2008
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From: Redmond, Or
Anyone using NOS?
I have a extra NOS kit in the garage, I took off one of my gassers before I sold it. I have been debating on putting it in the F-350 just for fun from time to time, but I am wondering what HP jet is safe? I have them from 25hp-175hp, this was a wet system for a gas rig, I just wont use the fuel solenoid. Any input would be great! the last thing I want to do is hurt this engine in any way, its the 3rd one
.... these things are getting expensive
.... these things are getting expensive
Smokin
Joined: Jun 2006
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Dunno but I googled it. Apparently, NOS systems for gassers and diesels are dramatically different. If considering it, definitely don't use an old system you got off a gasser.
Here is what the web says
Diesel Nitrous or NOS systems - differences
Here is what the web says
Diesel Engines and Nitrous
The fuel and nitrous ignites due to the heat of compression rather than at the correct point when the diesel injector fires. Normally there is just air in the cylinder, and the ignition only commences at the correct time as the diesel pump injects the fuel via an injector straight into the cylinder. The Diesel pump effectively controls the timing in the same way as the spark does for a petrol engine.
Adding Diesel fuel the the intake tract is a sure way to drive over your crankshaft. Adding just Nitrous without extra fuel just wastes the nitrous since there isn't any extra fuel available for it to Oxidize / burn. So it just gets thrown out of the exhaust. Doing this in a petrol engine would cause a weak mixture. Doing this in a diesel engine does not.
Diesels ALWAYS run "weak" so to speak since they always induct a full cylinder full of air as there's no throttle plate! Even at idle. Speed is controlled purely by the amount of fuel injected. They don't actually "run" weak as such, since the fuel enters via the injector at a single point and it always rich at the point of injection since its not evenly spread around the combustion chamber.
So at idle, and at less than full throttle operation much of the air travels through the engine unused. and unburned. At full power all the oxygen and all the fuel is consumed if the diesel pump is set up correctly. So if the diesel is set up any richer on purpose it just smokes. Because now all the air is used up, so the extra fuel goes out of the exhaust unburned. Now what happens if we add more oxygen (or rather Nitrous Oxide) while it runs rich and sooty? That's right, clean exhaust again and more power.
Diesels can use Nitrous Oxide to supplement their power too. But there are some important differences in the application.
To begin with you cannot inject diesel fuel and Nitrous Oxide into the intake system or ports as you would inject both fuel and Nitrous in a petrol engine. The reason is simple, the fuel ignites under the compression stroke and does so far too early in the cycle -- way before it should! This means your engine will either stop dead in its tracks or more likely break something expensive! Either way you really wouldn't want to try it!The fuel and nitrous ignites due to the heat of compression rather than at the correct point when the diesel injector fires. Normally there is just air in the cylinder, and the ignition only commences at the correct time as the diesel pump injects the fuel via an injector straight into the cylinder. The Diesel pump effectively controls the timing in the same way as the spark does for a petrol engine.
Adding Diesel fuel the the intake tract is a sure way to drive over your crankshaft. Adding just Nitrous without extra fuel just wastes the nitrous since there isn't any extra fuel available for it to Oxidize / burn. So it just gets thrown out of the exhaust. Doing this in a petrol engine would cause a weak mixture. Doing this in a diesel engine does not.
Diesels ALWAYS run "weak" so to speak since they always induct a full cylinder full of air as there's no throttle plate! Even at idle. Speed is controlled purely by the amount of fuel injected. They don't actually "run" weak as such, since the fuel enters via the injector at a single point and it always rich at the point of injection since its not evenly spread around the combustion chamber.
So at idle, and at less than full throttle operation much of the air travels through the engine unused. and unburned. At full power all the oxygen and all the fuel is consumed if the diesel pump is set up correctly. So if the diesel is set up any richer on purpose it just smokes. Because now all the air is used up, so the extra fuel goes out of the exhaust unburned. Now what happens if we add more oxygen (or rather Nitrous Oxide) while it runs rich and sooty? That's right, clean exhaust again and more power.
Postmaster
Joined: Mar 2008
Posts: 4,158
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From: Paramount, Ca
I had a small jet in my kit from an old civic kit I built to lend to a friend, I think its a 35hp jet. I put that into my intake for a little while to see how it would do. It was funny, it didn't really do anything. I think that the jet was just to small for that big of a motor. Try out a few, it really wont hurt anything other than the trans it's just oxygen. What causes damage is the extra fuel, the oxygen just helps everything burn more complete. If you are smoking a lot from an aggresive tune the NOS will help you take advantage of it.
Lead Driver
Joined: Oct 2004
Posts: 7,413
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From: Columbia, MO
Nitrous on a diesel isn't going to hurt anything. Basically, the nitrous just acts to add extra oxygen, which will help to completely burn any extra fuel. If you've got any black smoke at WOT, then you will see some benefit from the nitrous. However, if there is no black smoke, it won't help you at all, since there is no extra fuel to burn.
Adding nitrous will improve performance only so much, until all the extra fuel is burned. Once the extra fuel is burned, adding more nitrous will actually hurt performance, since there is now more oxygen than fuel. The best way to tune a nitrous kit is to keep stepping up in jet size until performance decreases, then go back one size.
Adding nitrous will improve performance only so much, until all the extra fuel is burned. Once the extra fuel is burned, adding more nitrous will actually hurt performance, since there is now more oxygen than fuel. The best way to tune a nitrous kit is to keep stepping up in jet size until performance decreases, then go back one size.
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Elder User
Joined: Apr 2008
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From: Redmond, Or
Understood, I was just going to use the nos soleniod, so I would be injecting nos only, (dry system) vs nos+fuel (wet) thanks for the heads up tho. I was thinking it would work the best in the 140 setting when I get nothing but a black cloud at WOT, it shurly would burn up some more of the fuel...
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Elder User
Joined: Apr 2008
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From: Redmond, Or
damb you guys are fast I was replying to the first thread to come back to two more! Thanks! I think i have a project comming up
Just cant leave well enough alone... Where is the most appropiate place to inject the NOS in a diesel ?
Just cant leave well enough alone... Where is the most appropiate place to inject the NOS in a diesel ?
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
You can put it just about anywhere after the turbo outlet. For only a single stage, most guys seem to put it right in the intake spider, just before the split...around the same location as the AIH. That's by far the easiest place to put it.
However, I've also seen it injected on the hot side of the intercooler, drilled and tapped on the inlet for the IC. The theory here is that the cooling effect of the nitrous will help the IC perform more efficiently. If it were me, I would be putting it in the inlet/hot side of the IC.
However, I've also seen it injected on the hot side of the intercooler, drilled and tapped on the inlet for the IC. The theory here is that the cooling effect of the nitrous will help the IC perform more efficiently. If it were me, I would be putting it in the inlet/hot side of the IC.
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If you want a 'performing' effect mount the nozzle just before the intake split.
Mounting pre-intercooler wastes nitrous. Sure, effectively cools discharge air through the intercooler but it doesn't matter what the temperature is with the introduction of nitrous it's GOING to cool.
Car kit? Small lines? Small solenoids? If your truck fuels hard don't be afraid to try no jet at all. When Jeremy said 'nitrous on a diesel isn't going to hurt anything,' he's right. It'll only choke it.
My .02, I had a good teacher.
Mounting pre-intercooler wastes nitrous. Sure, effectively cools discharge air through the intercooler but it doesn't matter what the temperature is with the introduction of nitrous it's GOING to cool.
Car kit? Small lines? Small solenoids? If your truck fuels hard don't be afraid to try no jet at all. When Jeremy said 'nitrous on a diesel isn't going to hurt anything,' he's right. It'll only choke it.
My .02, I had a good teacher.
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