how do you keep it a 900-1000 psi ? i barely bought a nos pressure guage and found out that i was running at 350 psi? no wonder that 100 shot felt like ****???

 

Need a bottle heater..

 

bottle isnt a requirement it's a necessity,especially this time of year.

 

The "complete" kits the nitrous companies sell are really far from complete. To safely and effectively use N2O there are three major components they fail to include. A window switch, bottle heater, and pressure gauge are all needed. I guess they don't include them so they can advertise an artificially low price.

Anyway, as others have said, a bottle heater is needed.

Rich Krause

 

At that pressure, you were probably getting about a 40 horse shot, pig-rich no less! Cold is like kryptonite to bottle pressure.

 

On the common 10# tank, how long would it take to warm up (understanding the varience in ambient temperature).

 

On a chilly fall day here (~50F) it will take 10-15 minutes to get the pressure up to 950-1000psi, which is where I run. On a warm summer day more like 5-10 minutes as best as I recall. Never paid too much attention to the time, just checked the pressure every 5 minutes or so. Once it's warm it really takes quite a while to cool down. So before subsequent runs it's just a couple of minutes.

Rich Krause

 

You deffinetly need a bottle heater. I live in florida and i use one. The automatic bottle heater is great it comes on and off automaticly which keeps bottle pressure right around 1000psi. You do still want the gauge though. I wouldnt trust the auto valve to always be perfect.

 

very good info guys i guess i'll go with a automatic bottle heater, thanks allot

 

I heard a good way to see the temp. is to use a fish tank thermometer, the sticky kind that you stick on. I have one and it works good and cheap too! You stick it on the upper 1/3 of the bottle.


Jeff

 

Here's the N2O Temp vs. Pressure data from the NOS website, with a few interpolated values:

TEMP--PRESSURE
degF------psi

32 ----- 460
40 ----- 520
50 ----- 590
60 ----- 675
70 ----- 760
79 ----- 850
80 ----- 865
83 ----- 900
87 ----- 950
91 ----- 1000
97 ----- 1069
100 --- 1100

Flow reduction due to pressure is proportional to the square root of the pressure ratio.... e.g. drop the pressure from 950psi to 800psi:

(800 / 950)^0.5 = (0.842)^0.50 = 0.918

Your 150-shot at 950 is suddenly a 150 x 0.918 = 138-shot

 

awesome chart becuase i have temp sticker on the bottle. thanks

 

I will usually but my bottle a bathtub full of hot water (im not kidding) this warms the bottle up really fast and then with a warmer you just have to maintain it with that and a blanket... Its been a great strategy for me for the past 3 years.

 

How do the bottles hold up in the Vegas Summer heat? I figured they'd be close to blowing the safety valve. If at 100*F the bottle is at 1100 PSI, what is the in-car bottle PSI when it is 130*F outside?

 

I have seen 1350 with no heater, this past summer.. But I never really keep my bottle in my car... 98% I keep it in my garage.. almost never have to heat it.. Summers are nice because they hold pressure with just a bottle blanket and thats it