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Take A Look At This Nitrous Schematic
#892026
12/30/10 10:19 PM
12/30/10 10:19 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Romeo MI
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Guys take a look at this nitrous schematic... my buddy want to run a dual stage nitrous set up... on a single plate... see if there is a easier way to do it OR if you see any problems Thanks 
Last edited by MR_P_BODY; 12/30/10 10:54 PM.
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Re: Take A Look At This Schematic
[Re: mopardad]
#892029
12/30/10 10:46 PM
12/30/10 10:46 PM
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Joined: Jun 2003
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Romeo MI
MR_P_BODY
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Quote:
wouldn't you want to be able to purge with the system switch turned off, like at the end of a pass
The purge is to set the bottle pressure before the
run...also he is using the 1st solenoid to take the
load off the switch
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Re: Take A Look At This Schematic
[Re: MR_P_BODY]
#892030
12/30/10 10:48 PM
12/30/10 10:48 PM
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Joined: Jan 2003
Posts: 549
Bristol, Va
fasteddie
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mopar
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Bristol, Va
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I think I would also use a low fuel pressure switch so if fuel pressure dropped to a certain point it would shut down the entire system. Mine is wired into the arming switch ground wire.
2003 Bristol Dragway Sportsman Champion
2016 Bristol Dragway Power Hour Champion
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Re: Take A Look At This Schematic
[Re: mopardad]
#892031
12/30/10 10:49 PM
12/30/10 10:49 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Quote:
I also think that the wire feeding the WOT switch should not be fed via the relay (just the fuel pump)
I don't know about 2 stage N2O systems but do you shut off the first stage when the 2nd stage is activated ? it appears you are. Does the N2O retard have 2 wire activating it, that seems different from ones I have wired
Yes it does shut off the first stage and opens the
2nd via the timer.... and as I said above he is using
the first relay to take load off the switch
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Re: Take A Look At This Schematic
[Re: fasteddie]
#892032
12/30/10 10:51 PM
12/30/10 10:51 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Quote:
I think I would also use a low fuel pressure switch so if fuel pressure dropped to a certain point it would shut down the entire system. Mine is wired into the arming switch ground wire.
Good idea... I'll pass it along
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Re: Take A Look At This Schematic
[Re: smalltyredart67]
#892036
12/30/10 11:38 PM
12/30/10 11:38 PM
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Romeo MI
MR_P_BODY
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Quote:
Mr. Pbody you need to ask this question over on the bullet. There's way more important considerations than how to wire the purge, in fact everything else is more important than the purge. I am the furthest thing in the world from a wiring guru but I've learned a few things along the way, one of them is forget the low pressure switch(hobbs), not worth the effort. What about the trans break? that needs to be able to interupt the relay to turn on the solenoids. Ask Monte Smith specificly here or ask over on Yellow Bullet and you'll prolly get differing answeres overthere, but most likely they'll be useable.
smalltyredart
jeff r
Like I said this is for a buddy and its a foot brake
truck so no trans brake... I'm hoping Monte will
see this... I really dont go on YB much at all
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Re: Take A Look At This Schematic
[Re: MR_P_BODY]
#892037
12/30/10 11:40 PM
12/30/10 11:40 PM
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Joined: Dec 2003
Posts: 483
smalltyredart67
mopar
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mopar
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look up^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
smalltyredart
jeff r
sorry it looks like all those are for trans brakes, but some include digisets so it's not a total bust.
Last edited by smalltyredart67; 12/30/10 11:45 PM.
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Re: Take A Look At This Schematic
[Re: 602heavy]
#892040
12/30/10 11:49 PM
12/30/10 11:49 PM
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Joined: Aug 2003
Posts: 4,702
On the parachute mount
n20mstr
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master
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On the parachute mount
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Mr P
mAke sure the purge works all the time, the reason for this is you need a ball valve in the car. You open the valve right after the burnout and close it on the return road. After closing you want to purge the line so there is no load on the plungers in the nitrous solenoids. this makes the plungers last a lot longer and they are designed that the nitrous goes behind them and keeps them on the seat. If you have the ball valve in the car you are only loading the plunger for 10-30 seconds depending on how fast the car is and how fast you close the valve...Thats a lot better than having the bottle on and there is pressure on them for hour or more, in the lanes driving back etc
....BAD A$$ STREET CAR.....
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Re: Take A Look At This Schematic
[Re: 602heavy]
#892043
12/31/10 07:09 AM
12/31/10 07:09 AM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
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Lynchburg, VA
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I always run a low fuel pressure switch. That's up to you. If you do just be sure to install it on the high pressure side of the regulator. The pressure deviates too much on the low side and would just be a headache as the switch will blip when the fuel pressure has the slightest stumble. The real protection is a fuel pump taking an unexpected dive.
The retard appears to be hooked only to the first stage of nitrous. It needs to be at least a two stage retard and be hooked to both stages. Depending on the type of retard as in how it needs to be wired. Digital retard work different.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Take A Look At This Schematic
[Re: Leon441]
#892044
12/31/10 09:29 AM
12/31/10 09:29 AM
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Romeo MI
MR_P_BODY
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Quote:
I always run a low fuel pressure switch. That's up to you. If you do just be sure to install it on the high pressure side of the regulator. The pressure deviates too much on the low side and would just be a headache as the switch will blip when the fuel pressure has the slightest stumble. The real protection is a fuel pump taking an unexpected dive.
The retard appears to be hooked only to the first stage of nitrous. It needs to be at least a two stage retard and be hooked to both stages. Depending on the type of retard as in how it needs to be wired. Digital retard work different.
Yeah the retard needs to be to both... have to change
that and look at a 2 stage retard
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Re: Take A Look At This Schematic
[Re: MR_P_BODY]
#892045
12/31/10 10:44 AM
12/31/10 10:44 AM
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Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
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pro stock
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UK
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Sure looks like you are running a multi stage retard box the way those wires are hooked up to both stages........something like an MSD8790?...........ask you're buddy he may confirm. Leon , you are dead on regards those pressure switches fluctuating when solinoid opens/closes , even more so when pulsing solinoids , fitted correctly i've had no issues , bear in mind i use large spreads (high pressure fuel)
Last edited by 602heavy; 12/31/10 01:12 PM.
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Re: Take A Look At This Schematic
[Re: 602heavy]
#892046
12/31/10 04:15 PM
12/31/10 04:15 PM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
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Not the way I would do it, but that does not make it wrong. I like things, especially wiring, very simple. That said, I would wire my relays, with 12v to post 30 and out to the solenoids from post 87. This makes the relays hot all the time, with clean power. You wire the ARM switch, to put power to the WOT switch. The WOT switch, then triggers post 85 on relay 1 and can also trigger the timer, that turns on relay 2. The timing retards can either tie into the outputs from the relays, post 87, or can tie into the trigger, which is post 85. Ground post 86 on the relays. You can also tie the "hot" to the purge button, onto the arm switch. This way, if the purge won't work, you know you are not armed. I personally never use hobbs switches, never seen the purpose of one, plus they tend to cause problems with surging systems.
Monte
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Re: Take A Look At This Schematic
[Re: MR_P_BODY]
#892048
12/31/10 11:52 PM
12/31/10 11:52 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
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Some timers can be used in place of a relay. Such as an ARC unit.
I monitered my nitrous activation through the retard on the 7531 so I had data as to whether the hobbs ever caused any issues. Running 25PSI to the regulator and having a hobbs switch set at only 7psi installed in that part of the fuel system you will never see any blips on the hobbs. It is when people installed them according to NOS directions on the low side with only 5.5psi in the tuneup you have issues. I tried this and even at 2psi on the hobbs switch it would blip the activation circuit. This is when Steve Johnson and Richard Omally both explained to me that it needed to be on the high side if I wanted to use one. Never had an issue sense. In fact I had a fuel pump take a dive just before staging. The nitrous wouldn't work. I was pissed to say the least until I saw the fuel pressure gauge and got the car out of the way while there was some hint of fuel in the float bowls.
Monte you make a good point on the wiring of the relays. You would never want to run solenoid current through a microwsitch. Switches when failing can do two things stick closed or open. Nitrous activation is not a good place for a stock switch. Be very careful when purchasing these relays. Some are absolute junk. The ones that advertise 40A ratings are pretty good. You are better off to go to a junkyard and get relays out of the fuse box under the hood of a late model car. Most I have seen are a lot heavier built.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Take A Look At This Schematic
[Re: MR_P_BODY]
#892049
01/01/11 02:04 AM
01/01/11 02:04 AM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
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North Alabama
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Quote:
Thanks... I will pass this info on to him... its the
guy you meet on drag week with the 52 ford PU...
he's still trying to break stuff 
I do a lot of nitrous wiring for guys, even though they can't bring me their cars. I wire all the nitrous controls up on an alum panel, so that they only have a few wires to hook up and it's ready to go.
Monte
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Re: Take A Look At This Schematic
[Re: Monte_Smith]
#892050
01/01/11 02:29 AM
01/01/11 02:29 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Quote:
Quote:
Thanks... I will pass this info on to him... its the
guy you meet on drag week with the 52 ford PU...
he's still trying to break stuff
I do a lot of nitrous wiring for guys, even though they can't bring me their cars. I wire all the nitrous controls up on an alum panel, so that they only have a few wires to hook up and it's ready to go.
Monte
Thats what we're doing with this... on one panel
with just a few wires to hook up.... thanks to
all of ya for your comments/input
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.......motor survived for another season.
