97SS0594

just called the holley tech line and they said that the NOS wet shot fogger nozzle wont flow over a 150 shot!! i wanted to spray a 125 1st stage and a 175 2nd stage but by the sounds of it ill have to spray 2 150's i always thought guys where spraying 175 through thier motors through a fogger nozzle?

4mulaJoe

I believe it's the selenoids. NOS has always used those tiny selenoids on their basic kits.

srsnow

That’s not necessarily true. Even the smallest solenoids will flow 175hp they are a .073 orifice. As far as the nozzles go it depends on the nozzle. A "B" nozzle is not the best choice for trying to do 150hp because of the design of the nozzle (the sharp 90 degree turn the nitrous has to make to get out of the nozzle) can cause there to be a kind of stand off when you start going to jets bigger than .040. A "C" nozzle or Soft Plume will flow 150hp pretty good and has good atomization to boot. The "A" nozzle will also do 150hp it is the highest flowing nozzles NOS makes and may even be higher than a lot of other brands. The largest restriction in an "A" nozzle is the jet fitting which if I remember right was around .100" but you could put a bigger jet fitting in it if you wanted. Now in a low pressure system the fuel tube in the nozzle becomes something to worry about if you were trying to put a huge amount of nitrous through it. But in a high pressure system that isn't a concern. You have to keep in mind that the NOS nozzles were designed to be used in a direct port system where a .046 jet is a big jet. But that doesn't mean they can't be used in a single nozzle application you just have to know the quirks of the different nozzles.

mrr23

not true about small solenoids flowing 175 hp. i've done a couple of nitrous tests and found this out myself first hand. and nozzle size plays a role as well. here, mull over all the nitrous testing i have done on both cars.

learned here that going from a small solenoid with a .081 orifice to a large solenoid with a .125 orifice netted me 18.5 rwhp with exact same jet size of .063
http://www.stealthram.com/nxnytrex.htm

learned here that nozzle design plays a definite role in rwhp and a/f ratio given same jetting of .063/.033
http://www.centralfloridastreetcars....eshootout.html

and holley is correct on their nozzles, i tested both nozzles.

srsnow

If you look back at your dynos you notice that the A/F ratio leaned out with the bigger solenoid. The reason is you had less pressure drop across the bigger solenoid meaning more pressure got to the jets. But just because you make more power with a bigger solenoid doesn't mean the smaller one is not capable of a certain horse power level. The smaller solenoids have been used for years and will do what they are meant to do, but as you found out that doesn't mean that you can't make more power by going to something bigger.

And as far as the nozzles go he was told no NOS nozzle would support 150hp. I just pointed out that while that may be true for a "B" nozzle the "C" nozzle (Soft Plume) would do an ok job at it (Nitrous passage is approx. .060) and the "A" nozzle would certainly flow 150hp. But most people tend to forget about the "A" nozzle because it is an older design. The "A" nozzle was not in your nozzle shoot out.

Edit: Now that I re read the origanal question it says over 150 in which case the "A" nozzle would be the only choice.

mrr23

the answer i got was there was more liquid nitrous passing through the larger orifice. with what you said, if there was less pressure drop, then it means less restriction. which of course is true. i was given a little formula about nitrous jet to orifice size. once you reach about 70% orifice to jet size, you have pretty much maxed out.

.081/.063 = 77.7%
.125/.063 = 50.4%

ok, lets use the two runs that had very close a/f ratio

Run #35 - ny-trex nozzle with NX brand .062/.031 jets 461.50 rwhp 460.48 rwtq A/F 12.0:1 until 6300 rpms. This was with the supplied 40012 nitrous solenoid. It has a .081 orifice opening.

Run #37 - ny-trex nozzle with NX brand .062/.033 jets 475.04 rwhp 463.61 rwtq A/F ratio 11.9-12.2:1 This was with the 40040 Monster-shot nitrous solenoid. It has a .125 orifice opening.

still made 13.54 more rwhp with the larger orifice.

mrr23

here's another scenario back when i was using only one stage with the compucar small solenoids. out of a 50 hp increase, i only got 6.48 rwhp. the small solenoids are just too much of a restriction when you max out the orifice size. you do not get 100% flow through the orifice.

NA run before 276.62 rwhp 284.76 http://www.stealthram.com/familypics...et/cmnasae.jpg

.063/.033 150 shot motor rating 405.36rwhp 438.13 rwtq
total gain 128.74 rwhp 153.37 rwtq
http://www.stealthram.com/familypics...t/cmn2osae.jpg

NA run before 291.35 rwhp 296.64 rwtq http://www.stealthram.com/familypics.../slpairlid.jpg

.076/.046 200 motor rating 426.57 rwhp 517.84 rwtq
total gain 135.22 rwhp 221.2 rwtq
http://www.stealthram.com/familypics...rlid200n2o.jpg