I have an NX kit and due to time constraints, I'm still going through the "not spraying" dilema. What jets are for 100 shot? How about 125?

 

100hp shot...52Nitrous 33Fuel
150hp shot...62Nitrous 35Fuel

My instructions dind't list a 125hp shot, you'd probably have to call them and ask.

 

NX doesn't make jets for 125 shot for a LT1, onlt the LS1.

 

You can get jets in just about any size (diameter) you need. The correct jet size really doesn't have anything to do with the brand of the kit you are using, it's simple chemistry. There are different formulas which will give slightly different results, and the correct jets will vary with fuel pressure and bottle pressure. But for 42psi fuel pressure and 1000lb bottle pressure the following are jet sizes from a common formula.

HP N/F
50 33/19
75 41/24
100 47/27
125 52/31
150 58/33
175 62/36
200 66/38

Notice that these jets are smaller than the sizes from the NX charts. I think this is because NX wants people to think their kits make more hp than their competitors, or maybe it's because they are refering to rwhp? Their chart (as with other manufacturers) also recommend fuel jets a size or two larger than needed. That's because they don't want a lot of negative publicity from people blowing up their motors and that they are basing their recommendations on the lowest common denominator. They assume (correctly for the most part) that you will not understand the relationship between bottle pressure and the amount of nitrous delivered. CAUTION Note that with higher nitrous pressure, more nitrous will be delivered and a larger fuel jet will be needed to avoid a lean condition. Leaning out with N2O is very, very, very bad.

Do not use the above jet size recommendations unless you know your bottle pressure and fuel pressure are as indicated. For example, with a bottle prssure of 1200psi, instead of 1000psi a 58 nitrous jet will require a 36 fuel jet and not the 33 indicated above. To safely use nitrous either use an excessively large fuel jet or be sure your bottle pressure is correct before making a pass

Rich Krause

 

So, to get consistant 1000s, other than bottle pressure gauges... can you get a regulator like on a oxy/acetelyne welder. That way if the pressure goes over 1000 you'll still get 1000 smooth...

 

I don't know if there is a product like that.

Rich Krause

 

Yes NX rates theres at the wheels. I use the 52/31 for my s-10 on the 100 shot which is really nearly 125 at the flywheel. I always tune mine at a high bottle pressure(1150) that way I know I will never be lean. Unless of coarse there is a fuel problem.

 

That's my point. I haven't heard of any regulator out there for N2O. It could offer consistancy to keep the pressure at a steady rate until the bottle runs low.

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Also, the jet sizes mentioned above are relative to the TYPE of delivery system. If it is a spray bar versus single nozzle, then your jet sizes will be different. I had experience with Carb Spray Bars (similar to the TB Spray Bar used in LT1s) and the fuel jet is much higher.

 

That would be really nice!

 

are those pills for flywheel or rear wheel hp?

 

Flywheel, but you may see fairly close at the rear wheels depending on your setup.

Before using the jet sizes I posted, read the CAUTION statement. The fuel jets are calculated based on 1,000psi bottle pressure and will be too small if the bottle pressure is >1,000psi. This may lean the motor out and cause major engine damage.

Rich Krause

 

How about an automatic calculator?

www.azsupersport.com/nitrousjetcalc.asp



Mike

 

If the bottle pressure is under 1,000 psi it will just run rich, correct?

 

what about a 2 nozzle setup? just use the calc. and put 75 on each nozzle?

 

Yes.

Rich