After I had a bottle with supposedly just under 1000 lbs when heated that shot nothing but air after two 4th gear 150 passes on a dyno and two 75 4th gear passes on the highway, felt I might have not gotten a "good" fill. Everywhere I read, I should have gotten more out of it than that. (6 speed car)

I searched and found some people saying that after it gets down to 2-3lbs they see surging, but this was nothing but air. I purged till it was empty and that took 2-3 minutes! That says to me, A LOT of air in there!

So here is what Search brought me:

1) Heat bottle with valve open... close.. and freeze (assuming to create vacuum in the bottle before filling)

2) Freeze bottle

3) Go to a place with a pump

4) Do 1 or 2 AND go to a place with a pump.

 

does not matter to me if the place i go to has a pump or not i do option 1 and always get a good fill, did you check the weight of the bottle after the fill ????????

 

by the way between the street passes and the dyno did you leave the bottle on by chance, it will leak off past your noids slowly but surely. never leave the bottle on if not using it, it wont last........

 

No, I didn't ever leave the bottle open... and no, I didn't weigh it. Suppose it's time to buy a scale and keep it in the car to make sure I'm not getting screwed eh?

Do people typically weigh their bottles after a fill?

 

I've always just frozen the bottle. Doesn't matter to me if the place has a pump or not.

 

ummm sounds like u purged mosta it away or something...i can normally get 5-6 1/8 mile passes outa 1 10 pound bottle on a 200 shot...and yes a bottle even empty will take forever to empty exspecially with a purge...next time yours is ""empty"" open it up and wait for it to go empty and remember thats about like a 800 shot...so every second you have it open is about 2.5 seconds worth of you spraying if you really were

how did you get to the assumotion that your bottle was empty? you weigh it or did it just stop hitting?

 

I assumed it was empty when I went to purge and there was no water vapor any more.

 

I had one filled from the last of a big bottle at a local race shop. The guy said it would only get 7 lbs, but I couldn't get a decent hit off of it. It would surge and buck all the way down the track. Now I have mine filled from a local guy that races. He fills his own bottles. I leave my bottle with him and he pulls a vacuum and freezes the bottle. He doesn't have a pump, but he always gets a solid ten lbs in there. The first time I used a bottle from him it felt like my plate had bigger jets in it.

 

We use a pump. It's mainly just a quicker fill and usually more consistent. Especially once the mother bottle starts getting low, it helps ensure you can get a full fill.

 

I'm sure your photo shoot with your car purging, and purging by your aunts house didnt help! You just used it up. Just gete a blower, it doesnt go empty lol.

 

As long as you are getting 10 lbs it really shouldnt matter. Your never going to get 10 lbs of gaseou nitrous without it recombining into liquid nitrous....its all the same as long as you are in fact shoving nitrous oxide in there.. Now if there is actually AIR in the bottle...thats another story...but I have yet to see that myself.

Just make sure your bottle weight goes up 10 lbs (or 15 for a 15 lb bottle) as your servicing it....then pay attention to exactly how many tmes you spray. Ensure you are leak free on all connections as well.

 

After repeated refills, we need to totally bleed the bottle down. Why, well each fill introduces a little air, then after a while your shop will have a hard time getting the full 10lbs in, the air is taking volume and the pump can only go so far. this, imo, is the main reason some think they get bad refills, just not getting the full fill. Now wether or not your shop tells you how many lbs they put in... I always take my own scale and make sure i see a before and after lbs, cause I had the above issue a few times. The shop i go to now does the freeze thing, and about half the time for one reason or another can't get a full fill, same with the shop that uses a pump, so just beware what you're getting, cause as Al said it doesn't matter as long as you get your full 10lbs.
Robert