i've searched the board and come up with a list of different jettings for various HP levels for the lt1. here is a comparison:

NX jettings that i have come across:
75hp-41n/26f
100hp-52n/33f
150hp-62n/35f and 71n/35f

NW jettings that are listed with my kit:
25hp-24n/18f
50hp-33n/25f
75hp-42n/28f
100hp-55n/31f
125hp-59n/33f
150hp-70n/35f
175hp-76/38f

the jet calculator on www.azsupersport.com:
(assuming N20 1100psi and stock 43.5 fuel pressure)
50hp-33/20f
100hp-47n/27f
150hp-58n/34f
200hp-67n/39f
220hp-70n/41f
260hp-76n/44f (this one seems weird, my NW lists the 76n for 175hp)

i have been using the jet calculator so far so good....

what jets is everyone else using?

 

I started with defauls from those kinds of lists, but then tuned them on a dyno. There's going to be variations, and you want it right for your car. Keep in mind also that NX jets for RWHP (probably a marketing scheme) so that'll certainly add a twist...

Dave

 

I just talked to NX the other day on the phone and the said the jet sizes for 175 were 73-n and 41-f. The 200 shot would be a 78-n and a 46-f.
I also know the a 150 shot is a 62-n and 35-f.
Those are the current ones I Have.

 

keep in mind - some kits rate their "shot" at flywheel HP. and NX rates theirs at Rear wheel HP - so NX may have a slightly different N20 / fuel jet for their 100 shot vs a different brand....