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NOS Fuel Pressure Safety switch

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Old May 8, 2001 | 08:18 PM
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For those who are interested.



Old May 8, 2001 | 08:42 PM
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thanks tony.. this helps me out ..
Old May 8, 2001 | 10:54 PM
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Thanks for the pics Tony. This was VERY helpful. Just curious, i noticed you had a 3rd line (The braided one) coming from the fuel safety switch. I am using teh dry kit, will i need to hook that up? Or just tap into fuel lines and thats it. How does this bad boy work? I dont see how it kills the fuel off. Thanks. Any more pics of would be great.
Old May 9, 2001 | 02:32 AM
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Another question

What's the min psi setting on the switch. Depending on what hp shot you're running is it a good idea to change the min fuel pressure switch accordingly or one setting will do.
Old May 9, 2001 | 07:04 AM
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Originally posted by Synki
Thanks for the pics Tony. This was VERY helpful. Just curious, i noticed you had a 3rd line (The braided one) coming from the fuel safety switch. I am using teh dry kit, will i need to hook that up? Or just tap into fuel lines and thats it. How does this bad boy work? I dont see how it kills the fuel off. Thanks. Any more pics of would be great.
Thats for the fuel supply on his wet kit, you will not need it.
Old May 9, 2001 | 07:08 AM
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Re: Another question

Originally posted by CandiMan
What's the min psi setting on the switch. Depending on what hp shot you're running is it a good idea to change the min fuel pressure switch accordingly or one setting will do.
The switches come set pretty low. Yes you should change it. It is best to use a fuel pressure gauge to set it up to the pressure you need to run the correct A/F ratio on the dry kit. I set mine a few PSI below the pressure I need so it will hit good. If you set it at the pressure it may pulse.

The FPSS is wired into the ground of the main nitrous sol. on a wet kit or the second nitrous sol. on a dry kit.
Old May 9, 2001 | 07:51 AM
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The braided line is for fuel to the my fuel solenoid. Dry kit doesn't have this. The FPS is provides ground to my main relay. This main relay powers the nitrous solenoid and the fuel solenoid. If the pressure drops below the set point, no more ground. The MSD window switch works the same way. It cuts the ground on and off.

Originally posted by Synki
Thanks for the pics Tony. This was VERY helpful. Just curious, i noticed you had a 3rd line (The braided one) coming from the fuel safety switch. I am using teh dry kit, will i need to hook that up? Or just tap into fuel lines and thats it. How does this bad boy work? I dont see how it kills the fuel off. Thanks. Any more pics of would be great.
Old May 9, 2001 | 07:59 AM
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One Max to Envy

Why did you choose the wet over the dry kit and what's the pros and cons between the two. I have a extra set of intake plenum and manifold and was considering the wet kit. This will give me enough time to tape the plenum for the foggers before installing to reduce down time
Old May 9, 2001 | 08:11 AM
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Before I forget

Is it easy to change your HP shot setting, do you have to change each individual nitrous and fuel foggers
Old May 9, 2001 | 08:24 AM
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Re: One Max to Envy

Wet kit has many advantage over dry kit.

1. It's easier to tune.

2 I don't have to mess with fuel pressure or the fuel pressure regulator.

3. I don't have to worry about maxing out the fuel injectors or the fuel rails...etc. Direct port kit basically takes half of the OEM fuel system out of the equation. However, I do still have to worry about the fuel pump and fuel lines.

4. All the cylinders get the same amount of nitrous. My tuner blew 2 Supra motors using a dry kit, but didn't have anymore problems when he switched to direct port kit. His Supra was running 9s. The first few cylinders will always get more nitrous than the rest on a dry kit. This cause possible lean condition for the first few cylinders.


The only draw back of direct port kit is the installation. Takes more time.

Originally posted by CandiMan
Why did you choose the wet over the dry kit and what's the pros and cons between the two. I have a extra set of intake plenum and manifold and was considering the wet kit. This will give me enough time to tape the plenum for the foggers before installing to reduce down time
Old May 9, 2001 | 08:27 AM
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Re: Before I forget

You have to change jets on each fogger, but I have more control over how much fuel than dry kit. On the dry kit, you control how much fuel via the adjustable fuel pressure regulator.

Originally posted by CandiMan
Is it easy to change your HP shot setting, do you have to change each individual nitrous and fuel foggers
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