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Author
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Topic: Nitrous ?
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jstang70
Journeyman Posts: 2
From:
Registered: Mar 2001
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posted 03-26-2001 12:22 AM
   
Hello everyone, this is my first post here, hope to learn and help others as much as possible  On to my question, when hooking up a nitrous system, if you use a dedicated fuel pump just for the nitrous, say, a Holley Blue, every time you arm the system and turn on the pump would there be any air that might be in the lines that could cause the system to run lean until fuel is supplied?
Should you turn the pump on for a few seconds before you are gonna spray? Thanks-Jeff ------------------
70 Fastback Under construction
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n2oMike
Gearhead Posts: 719
From: Spencer, WV
Registered: Jan 2001
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posted 03-26-2001 12:36 AM
Go to...http://www.supermegajayman.com/car_stuff/nitrous_tuning.htm This is a post I made to the fordnatics mailing list. It's all you need to know to get started with your install and tuning. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
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Doc
Gearhead Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001
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posted 03-26-2001 12:47 AM
Yes since the air has no place to escape except through the fuel soliniod air stays in the line and can cause a lean pop when activated much like the Dodge boys Pro Stocker used to do . Also when the fuel is dead headed most regulators will creep and give false pressure readings, even when the pressure is set with a flowing jet the mix will be rich down low and right up top. I've been working with a full time bypass just before the soliniod so the fuel runs all the time hence no air in the line and is small enough so it still has enough pressure to feed the juice at a constant rate. The one in use now is a Holley blue pump with a .040 jet in the bypass and seems to be happy. I'll have another running soon the same way.
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jstang70
Journeyman Posts: 2
From:
Registered: Mar 2001
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posted 03-26-2001 01:14 AM
Would it be possible to wire a momentary switch in addition to every other switch with the fuel solenoid, acting as a sort of fuel purge just prior to hitting the juice?
Interested to hear others opinions on this.------------------
70 Fastback Under construction
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Doc
Gearhead Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001
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posted 03-26-2001 01:29 AM
You can just purge the whole system through the motor at around 2000 to 3000 RPMs and it takes the air out of both lines. Just hold the Rs steady and tap the button a couple/three times for a half or whole second it should bring the Rs up quickly when it's ready. I contend the nitrous line gets colder and increases the air side during the run so if you purge the nitrous side big and have the fuel side ready it makes more power in the first foot of the run so I play with stuff like the bypass .
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n2oMike
Gearhead Posts: 719
From: Spencer, WV
Registered: Jan 2001
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posted 03-26-2001 01:39 AM
I use a dedicated pump for the nitrous, along with a return style regulator. This allows for a constant, seamless fuel pressure that is easily adjusted. The system on my car has a two way switch... Switched on way, the nitrous is activated by a button on the shifter, the other way makes it throttle activated... via a micro switch on the carb. Before a run, right after the burnout, I'll switch it to "button" mode, bring the revs up to around 3000 in neutral, and tap it a couple times to prime the fuel solonoid.... After that, switch to throttle mode, go to the line, purge the nitrous, get ready to launch on the bottle, and row that toploader!  MAJOR fun! First gear doesn't last long at all... and you're in 4th by the 1/8 mile, which goes by in 6.74 seconds.  Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/motorcitymustang/cmml/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367 [This message has been edited by n2oMike (edited 03-26-2001).]
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Big D
Gearhead Posts: 2516
From: WELLS, NEVADA
Registered: Nov 2000
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posted 03-26-2001 02:06 PM
Jeff,Welcome to M&M.. The people here are friendly and knowledgable, as you can tell.. You should go to Sam's Place an introduce yourself... We'd like to know more about you and your car.. or is it cars.. Don ------------------
Previously Known As Don H McDonald
Brilliant Blue 1966 2+2
https://mustangsandmore.com/ubb/BigD.html
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