Hey guys, I have my bottle mounted perpendicular to the car, between the "speaker bar" and the strut bar.

I'm having a problem with pressure drop after only like, say, 6 third gear pulls (it will drop from 950 to 850 over the entire run) after that point.

First of all, I assume that that should only happen when I'm running low on nitrous, or will it do that with half a bottle even with it mounted parallel to the direction of the car?

Secondly, I have the bottle set in at a 45 degree angle, with the label towards the front of the car. I have a dynotune bottle -- the pickup IS opposite of the label, right?

The front of the bottle is elevated compared to the rear, but not very much (using the mounts that came with the kit) -- thinking about trying to elevate the front more - I would love to leave it where it is, but I'm more of a function > form kind of guy, so if you guys think I should just give up and throw it in the main trunk area, re-oriented, I may just do that.

Either way, any tips on getting the most out of my bottle with it still "sideways"?

 

Not the best solution, but a solution none the less. Bottle position is still important, but you will be able to use more of your nitrous and keep consistent pressure

http://www.nanonitrous.com/

 

Actually, I experience similar problems as you. If you search for my thread, then you'll see how my bottle is oriented.

Anyway, I actually have the "front" elevated a bit higher, about 1", using rubber "spacers" I just got at Home Depot/Lowe's. I'm not sure if it actually does anything, but I definitely don't use majority of the content of the bottle. The bottle pressure drops quickly after the first 4 or so runs at 100whp shot at the 1/4 mile drag strip. I am spraying for 12+ seconds each time, so I guess it's not that bad. The runs after that will experience faster pressure drops and longer heating time.

I guess you can re-orient the bottle so that it is parallel with the car or get a second heater to compensate for the pressure drop. I've actually been thinking about the latter for a good while now, since I like my bottle where it is and nobody ever notices that it's even there. Plus, it'll end up being cheaper than the Nano system which I've contemplated on as well. Second heater would be all right, but it probably won't heat it up fast enough to keep the pressure from dropping (or not much anyway), though.

Also, I'm not sure if you've thought about this, but I also have a bottle blanket to help keep the heat from dissipating.

 

Any experience with this yourself?

 

Pressure drop is more a function of temperature than position of the bottle. You want it tilted as they recommend to keep the pickup tube in the liquid nitrous as the level drops low, like the last 2-3 pounds. When you do back to back pulls, the evaporation of the liquid nitrous in the bottle cools it, lowering the pressure. A good heater will help, but it can only heat it up so quickly, and the bottle can get COLD fast if it's spraying constantly and with a good-sized shot.

 

Yeah, I have a heater, but even with it on during a run, I'm getting the 950->850 drop if I'm below half a bottle. I think I may just give in and move it to the hatch, or atleast elevate my front mount.

Does anyone know anything about bottle filling? Could it be possible that I got a "bad fill" and theres a lot of compressed air in there? I have zero clue how bottles are filled, never seen it done.

 

The level or tilt of the bottle won't change the pressure. A heater can't keep up with how cold the bottle will get while spraying, they rely on the time between runs to get temps back up.

Either go with a nano system for constant pressure, dual bottles for less temp change, or don't worry about it

 

Okay, so pressure drop would be happening regardless of bottle orientation? That makes sense, when I think about it. Orientation would just affect whether or not I was picking up liquid nitrous. Should have thought about that more.

So is it possible to really refill a half-full bottle of nitrous and still get a good fill? I mean, I dont mind going in twice as much, if I'm really getting half a bottle.

 

Your above post doesn't take into consideration that not all of the liquid nitrous will be picked up through the siphon tube. In his and my case, the bottle position does matter more than you think as our bottles are parallel with the axles. That is, we will pick up less of the liquid nitrous oxide at WOT as we use up more of the liquid nitrous oxide.

Like I said, either go with a better/additional heater to reduce downtime, get the Nano system to raise bottle pressure, and/or reposition the bottle (raise the top/front or position parallel to wheels) for maximum liquid nitrous utilization.


BTW, for those who took intro chem or physics, think IGL (PV=nRT). If one side drops due to 1 or more variable, the other side will follow suit by changing its variable and vice versa.



To simply put, yes. But again, you cannot rule out the bottle position.

And when you go in for a refill, you always want to empty out the content first and then get a fresh refill as there are other mixed gases in there that aren't beneficial to you.

 

I know exactly what you are talking about, my dad's truck has the bottle mounted like that, sideways under the back seat. It is on the holley brackets, with the 15 degree tilt or whatever they provide, and I turn the bottle (rotate it in the mounts) so the tube is in the lower rear quarter. It works just fine until you get to the last 25% or less, then you can't guarantee complete liquid nitrous, but thats the chance you take to mount it like that.

Absurd, you can absolutely fill a half-empty bottle and get a good fill, I used to all the time. I would pull it whenever I went to the guys shop, if it was empty or only down 4 pounds, I had it filled. Gotta be ready

 

As you open and close the bottle for spray or purge, the gases from the atmosphere tend to get into the bottle. I'd rather pay the extra few bucks and get a clean refill versus having some of the old nitrous oxide (which also degrades) and atmospheric gases in there.

 

Not trying to be rude or anything, just curious. How exactly is that possible? The bottle has at least 20-25 times as much pressure inside as the outside air does, and it also has 14ft of line and a solenoid closing it off from the atmosphere unless it is flowing out gas.

I'd be more concerned if you were opening the bottle to fully empty it and just had it sitting out of the car with the valve open, that would let it get air in there. Otherwise, as long as you keep pressure in it, nothing can flow back in, from my understanding. If I'm wrong, please educate me.

 

Actually, I don't know wtf I was smoking when I typed that.

What I meant to say was, when you refill the bottle (regardless of whether you just get a refill or empty the content first then refill) the atmospheric gases will get in the bottle anyway. And again, nitrous oxide degrades over time. That is, there are additional gases present in nitrous oxide, like sulfoxides, which may react with nitrous oxide and other gases over time.

So, why not empty out the old nitrous oxide and get fresh nitrous oxide? At least, that's why I do it.