I have a compucar plate system and I have jets for a 50, 75, 100, 150 shot. When I put in the jets for the 50 shot, the car would spark knock. The jet sizes for the 50 shot were Nitrous-43 / Fuel-18. I put in Fuel jet 22 and kept the size 43 jet for nitrous and still had spark knock. I went with the size 25 fuel jet that came with the 100 shot kit and now it pulls a lot better and theres no spark knock. I don't know what the hp output is now, but I have a 50hp nitrous jet and 100hp fuel jet.

I saw the thread where someone listed the NX jet sizes along with hp levels and it seems a whole lot different than the sizes that compucar uses.

compucar jets
Shot______N20______Fuel
50________43_______18
75________46_______22
100_______52_______25
150_______63_______35

nx jets
Shot______N20______Fuel
50________35_______20
75________41_______24
100_______52_______31
150_______62_______35

Any idea why compucar recomend running smaller fuel jets than the other brands at the lower hp levels? and I'm curious if anyone else here has used a compucar kit and had any problems running the recomended jets?