Nitrous question
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
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From: Forked River NJ
Nitrous question
For all you guys running N20. Not the multi stage Godzilla N20 systems, an adjustable plate system of about 150 HP. Do you run an electric or can you get away with a mechanical pump. I have read that you get inconsistant fuel pressure at the nozzle due to the pumping action of the mech. pump. This can lean out the fuel side and ruin your day. Even if you maintain a constant 6 or 7 pounds is the pumping action going to hurt the Nitrous/fuel mix.
Le Mans Master
Joined: Apr 2005
Posts: 6,339
Likes: 416
From: Seattle Area WA
I always ran a Carter Hi Output mechanical fuel pump and never had a problem. I don't think you will see pulsations that would hurt anything.
If you run an orificed return "T" fitting, you are going to have a pretty constant fuel pressure.
If you run an orificed return "T" fitting, you are going to have a pretty constant fuel pressure.
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
For all you guys running N20. Not the multi stage Godzilla N20 systems, an adjustable plate system of about 150 HP. Do you run an electric or can you get away with a mechanical pump. I have read that you get inconsistant fuel pressure at the nozzle due to the pumping action of the mech. pump. This can lean out the fuel side and ruin your day. Even if you maintain a constant 6 or 7 pounds is the pumping action going to hurt the Nitrous/fuel mix.
I know of a few guys running smaller shots with mech pumps..so far so good. I have no personal experience.
Thread Starter
Race Director
Joined: Dec 1999
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From: Forked River NJ
Team Owner
Joined: Jul 2001
Posts: 182,997
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From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
your fuel requirement really depends on your total horsepower.. If you know what total horsepower (including the nitrous) you are expecting, it can be calculated how many gph you will need to feed carb and nitrous..
How many HP does your engine have (at the crank)?
Another issue with a mechanical pump is that under heavier acceleration, you will lose pressure from the tank to the pump. My electric pump pumps at 18 - 20 psi. The acceleration will reduce the pressure but I still have plenty at the regulator..where I regulate it down to 6.5 - 7 psi...
How many HP does your engine have (at the crank)?
Another issue with a mechanical pump is that under heavier acceleration, you will lose pressure from the tank to the pump. My electric pump pumps at 18 - 20 psi. The acceleration will reduce the pressure but I still have plenty at the regulator..where I regulate it down to 6.5 - 7 psi...
Burning Brakes
Joined: Feb 2006
Posts: 1,173
Likes: 5
From: Paducah Ky
I have not run mine yet but I used the mech pump, a fuel log with a return line out the back end, and a bypass type regulator mounted on the pass fenderwell right above the factory lines. My thinking was to use the volume of the log and return line to the regulator to smooth the pulses of the mech pump. Also, this setup with the bypass regulator should always keep cool fuel to the engine.
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Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
your fuel requirement really depends on your total horsepower.. If you know what total horsepower (including the nitrous) you are expecting, it can be calculated how many gph you will need to feed carb and nitrous..
How many HP does your engine have (at the crank)?
Another issue with a mechanical pump is that under heavier acceleration, you will lose pressure from the tank to the pump. My electric pump pumps at 18 - 20 psi. The acceleration will reduce the pressure but I still have plenty at the regulator..where I regulate it down to 6.5 - 7 psi...
How many HP does your engine have (at the crank)?
Another issue with a mechanical pump is that under heavier acceleration, you will lose pressure from the tank to the pump. My electric pump pumps at 18 - 20 psi. The acceleration will reduce the pressure but I still have plenty at the regulator..where I regulate it down to 6.5 - 7 psi...
I assume I am making in the neighborhood of 500 HP at the crank because I ran 409 HP at the rear wheels.
Team Owner
Joined: Jul 2001
Posts: 182,997
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From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Yes I agree on this. My fuel pressure stayed rock steady at 6 psi from idle to 6200 rpm on the dyno but this was not moving. When the car is accelerating you most likely will see a drop. The engine builder who machines my motor said to use a electric at the tank and a mech at the motor to insure you will have plenty of fuel. I have not made a pass at the strip yet with the fuel pressure gauge hooked up.
I assume I am making in the neighborhood of 500 HP at the crank because I ran 409 HP at the rear wheels.
I assume I am making in the neighborhood of 500 HP at the crank because I ran 409 HP at the rear wheels.
If you are already at that horsepower level, I would not run a mechanical pump.. Get a electrical one!! You can pick up a new 140 gph pump for under $100 on ebay..
I'm still in the experimenting phase with my nitrous setup too but I'd definetely go with a electric pump at that horsepower level!!
Thread Starter
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
If you are already at that horsepower level, I would not run a mechanical pump.. Get a electrical one!! You can pick up a new 140 gph pump for under $100 on ebay..
I'm still in the experimenting phase with my nitrous setup too but I'd definetely go with a electric pump at that horsepower level!!
I'm still in the experimenting phase with my nitrous setup too but I'd definetely go with a electric pump at that horsepower level!!
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
I also have a indicator light if the solenoids open up.. If they'd shut down due to lack of fuel pressure, I'd see the nitrous light turn off..
Last edited by GrandSportC3; Jan 24, 2007 at 08:15 PM.
Drifting
Joined: Nov 2002
Posts: 1,951
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From: Shore NJ
what's next "Pinks"
Last edited by 73jst4fun; Jan 24, 2007 at 09:24 PM.