WAAAAYYY too much PSI!!
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Registered User
Joined: Aug 2000
Posts: 381
From: kentucky
WAAAAYYY too much PSI!!
Just wanted to post this prob I had at the track the other night. I've got the NX kit with the "auto" heater, transducer deal, just got my bottle filled and headed to the track. I turned on the heater to make sure I was all ready to go, got like a 45 minute drive to the track. When I got there I removed my spare cover so I could check out my pressure and talk bout hot!! PSI was sitting on about 25-2600
. Scared the $hit out of me, had my 9 yr. old son with me. I've got the blow down tube hooked up to spec. outside of the car etc. but I didnt flare none of the fittings cause its a bitch getting everthing lined up it just kinda slip fits together. Anyone ever had to "use" their blowdown tube? If you got this type heater, just keep an eye on your psi, dont rely on anything! I almost forgot to purge to get the psi down, prolly would have leaned it out with 2500 psi ya think, had to waste abunch of N2O, that really sucked.
. Scared the $hit out of me, had my 9 yr. old son with me. I've got the blow down tube hooked up to spec. outside of the car etc. but I didnt flare none of the fittings cause its a bitch getting everthing lined up it just kinda slip fits together. Anyone ever had to "use" their blowdown tube? If you got this type heater, just keep an eye on your psi, dont rely on anything! I almost forgot to purge to get the psi down, prolly would have leaned it out with 2500 psi ya think, had to waste abunch of N2O, that really sucked.
Registered User
Joined: Dec 1969
Posts: 376
From: Chandler, AZ
The way the NX kit works you have to make sure the bottle is OPEN before you turn on the heater!!! Other wise the pressure builds up but becasue the bottle is not open the pressure sensor cannot read what is going on so it just keeps heating away!
I'm pretty sure i had it on though, I always spray alittle right before I get to the track to make sure its working OK,HMMM
Registered User
Joined: Apr 2000
Posts: 555
From: Yakima WA
A couple points worth noting:
-XKnight is correct, in that most installations require the bottle vale to be open or else just what you had happen WILL occur. The Transducer can't sense the pressure if the Valve is closed.
-If you want to run the heater while the valve is closed NX makes another fittting that can be put in the Blow-Off port that will allow you to to do this. If you like I can snap pictures of my bottle with said fitting.
-As far as a lean condition, it would've actualy been opposite. the N20 Solenoid probably would've never opened with that much pressure against it. Anything above 1100-1200psi and the Noid probably isn't going to open.
Good luck! And fix that Blowdown tube!
-XKnight is correct, in that most installations require the bottle vale to be open or else just what you had happen WILL occur. The Transducer can't sense the pressure if the Valve is closed.
-If you want to run the heater while the valve is closed NX makes another fittting that can be put in the Blow-Off port that will allow you to to do this. If you like I can snap pictures of my bottle with said fitting.
-As far as a lean condition, it would've actualy been opposite. the N20 Solenoid probably would've never opened with that much pressure against it. Anything above 1100-1200psi and the Noid probably isn't going to open.
Good luck! And fix that Blowdown tube!
Registered User
Joined: Jul 2000
Posts: 1,428
From: Woodstock,Georgia
Originally posted by KTamez
-If you want to run the heater while the valve is closed NX makes another fittting that can be put in the Blow-Off port that will allow you to to do this.
-If you want to run the heater while the valve is closed NX makes another fittting that can be put in the Blow-Off port that will allow you to to do this.
Thanks
Registered User
Joined: Apr 2000
Posts: 555
From: Yakima WA
Hmm, I can't seem to find the part # online, I'll try to look hrough some paprwork when I get home.
I'll snap some shots of it tonite also.
I never actually purchased these as they came on a couple of Carbon Fiber bottles I used.
-K
I'll snap some shots of it tonite also.
I never actually purchased these as they came on a couple of Carbon Fiber bottles I used.
-K
GP Moderator
Joined: Nov 1999
Posts: 645
From: Columbus, Ohio
Kurtis, another interested person in that fitting, for sure. I'd find it very useful; I'd just run the bottle heater every time I drove the car, and if I "needed" it for some reason, I'd just run the remote bottle opener; this way I'd never have to waste nitrous in my lines if I decide not to use it.
I'd also like to know how you knew there was 2500-2600 lbs of pressure in the bottle? I've never seen a nitrous pressure gauge go that high. My Autometer gauge in my dash only goes to 1600psi. I have a liquid filled NX gauge in the back (I have an older style NX heater that had the nitrous gauge built into the bottle heater tranducer), and it only goes to 1500psi.
I've had my bottle hit 1200 psi before; ran the heater too long with the bottle closed (forgot about it). Nothing really alarming; I just had to let it cool off a little.
I'd also like to know how you knew there was 2500-2600 lbs of pressure in the bottle? I've never seen a nitrous pressure gauge go that high. My Autometer gauge in my dash only goes to 1600psi. I have a liquid filled NX gauge in the back (I have an older style NX heater that had the nitrous gauge built into the bottle heater tranducer), and it only goes to 1500psi.
I've had my bottle hit 1200 psi before; ran the heater too long with the bottle closed (forgot about it). Nothing really alarming; I just had to let it cool off a little.
Registered User
Joined: Apr 2000
Posts: 555
From: Yakima WA
Guys I apologize, I just didn't have time to get to this and I'm heading out of town this morning. My bottle(s) are out at my dad's house though I have to pick them up this morning before I leave, and so I'll take some pics of how this thing works when I get back Friday evening.
Registered User
Joined: Apr 2000
Posts: 555
From: Yakima WA
OK Here ya go.
Standard Bottle Setup with NHRA 8AN Blowoff fitting:
http://www.lt4-396.com/New/DSC00258.JPG
Bottle With Pressure Port Fitting and NHRA 8AN Blowoff fitting:
http://www.lt4-396.com/New/DSC00259.JPG
Comparison showing Loose Pressure Fitting w/ NX Heater Transducer and Pressure fitting on Bottle w/o Transducer:
http://www.lt4-396.com/New/DSC00260.JPG
Sorry guys, I can't seem to find the part # for this thing. If ya give Ricky a call at NX I'm sure he can find it for ya.
Good luck!
Kurtis
Standard Bottle Setup with NHRA 8AN Blowoff fitting:
http://www.lt4-396.com/New/DSC00258.JPG
Bottle With Pressure Port Fitting and NHRA 8AN Blowoff fitting:
http://www.lt4-396.com/New/DSC00259.JPG
Comparison showing Loose Pressure Fitting w/ NX Heater Transducer and Pressure fitting on Bottle w/o Transducer:
http://www.lt4-396.com/New/DSC00260.JPG
Sorry guys, I can't seem to find the part # for this thing. If ya give Ricky a call at NX I'm sure he can find it for ya.
Good luck!
Kurtis
Last edited by KTamez; Oct 26, 2002 at 10:39 PM.
Registered User
Joined: Aug 2001
Posts: 152
From: Memphis
Originally posted by Joe Brodman
I've had my bottle hit 1200 psi before; ran the heater too long with the bottle closed (forgot about it). Nothing really alarming; I just had to let it cool off a little.
I've had my bottle hit 1200 psi before; ran the heater too long with the bottle closed (forgot about it). Nothing really alarming; I just had to let it cool off a little.
I always ran with 1100psi-1200psi
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