Nitrous

[superstang01]

Hey,
What is teh safest shot of Nitrous to run on a stock 4.6 motor with only an intake doen to it. I have been hearing that between 75-100 are good and reliable. Is this true?

 

[Kilgore Trout]

A zero shot is the safest for you and the other drivers around you. At the track 75-100 is cool.

 

[the98stang]

Kilgore is right, but I doubt you had any intention of using the spray on the public roads

Some people choose to go direct port with nitrous because it IS the safest option. With direct port, the nitrous is sprayed evenly into each intake runner, making sure each cylinder gets the same amount of nitrous and fuel. If one cylinder recieves more nitrous than the others, your engine could be at risk.

The next safest system would be a wet kit. Fuel and nitrous are both mixed together and spraying into the intake tubing and sucked into the engine. The problem is, 4.6L intake manifolds don't like too much fuel or nitrous. If fuel "puddles" in the intake, or nitrous, then the intake explodes, almost always damaging hoods or even worse, the cylinder heads. This can be prevented by buying a non-plastic intake for your GT. You can also buy safety features for your set up to prevent this from happening.

On stock internals, the biggest shot I would do personally is a 100 shot. Our pistons and rods can't handle much more than 375-400WHP. And the bigger the shot, the more chance you have of blowing your intake. So if you DO get a 100 shot, be sure to have the car tuned on the dyno. You want your AF ratio perfect so the car doesn't run lean.

If your running a 100 shot, I would highly recommend an upgraded fuel pump as well. Such as a SVT Ford Focus pump, or GT40 fuel pump.

I think your stock pump could handle a 75 shot. Just be sure you run the highest octane gas you can. Here in CA I can only get 91 . You will also need 2 step colder plugs such as NGK tr6's or Autolite 103's.

I highly recommend you get these safety features as well: window switch, WOT switch, fuel pressure safety switch, fuel pressure gauge, nitrous pressure gauge.

I hope this helps you out. Just be sure you do tons of research before you decide to spray. And before you even think about spraying, get your car compression tested and monitor the oil pressure with an aftermarket gauge. Feel free to ask questions

Tanner

 

[Red2000GT]

I agree with tanner on the safety switches but the factory pump is a 190lph and will handle up to a 150 shot(I personally have ran 175 without problems). I don't recommend running the 150 without some other engine mods but the worst i ever did was burn a valve after a couple dozen 150 shot runs at the strip.

 

[kyles03sonicgt]

Not to hijack the thread, but the only thing I personally worry about with my nx wet kit is blowing my intake into pieces...If I were to get a new intake manifold would this reduce the chances of puddling?? What are some of the best intake manifold's for our cars?? I know the p-51 is awesome, but its spendy, what other choices do I have??

 

[the98stang]

Not to hijack the thread, but the only thing I personally worry about with my nx wet kit is blowing my intake into pieces...If I were to get a new intake manifold would this reduce the chances of puddling?? What are some of the best intake manifold's for our cars?? I know the p-51 is awesome, but its spendy, what other choices do I have??

I know some people go with the bullit intake '

I think if it's gonna blow it's gonna blow. No matter what intake you have on there.

 

[Pennywise2]

With all the saftey equitment you should be fine.
Nitrous Express 75 or 100hp jets should give you
a nice kick in the pants.

 

[aleborjas]

150 shot with a WET kit and colder plugs... thats safe you can even call NX and they will tell you the same!

 

[kyles03sonicgt]

Ya, I think people who blow their intake to pieces just dont go about all the safety features...

 

[BooWFO]

There is raging debates over just what and how the dreaded BOOM occurs.
Some believe it is large shots. - Makes some sense in the common thinking way. flowing fuel through a dry intake the larger the amount of fuel the greater the problem.
Some believe it is the lack of safety devices - Again makes sense, If you spray too low in the RPM's fuel and nitrous don't get sucked in. IF you spray and hit the rev limiter fuel from injectors is getting cut..
Some believe it is just a matter of time - Again makes sense. Odds are flowing fuel and nitrous through the intake will eventual lead to bad things.
Some beleive the fuel weakens the intake - again makes some sense due to the fact it wasn't designed to flow fuel and we all know the caustic nature of gasoline.

But if you read and are an informed user with a system with a clean bill of health and keep the shots to within the "normal" ranges the dreaded boom seems less likely.
Aka don't try and double the power of the car on nitrous try to keep the shot to around 50% of the cars power. Take all the precautions you can with your system. Even on a new kit Verify that solenoids work correctly. Run the highest octane gas you can, colder plugs ( I like NGK tr6's), and know what is going on with the car and system.
Of course the quick answer is the lower the shot the less likely it is to occur. I haven't heard of anyone having issues with a 100shot or less.