nikolt1

So I have a nos wet kit. I'm just wondering what jets I should be running. In the instructions they recommend a 65N and 38F for the 125 hp at 43psi fuel pressure. I checked out some calculators and they say I whould be running a 55N 32F jets for 125 hp. What jets should I run? Thanks

http://www.holley.com/data/Products/.../199R10297.pdf page 6

reamo04

the kit you have is probably rated at the rear wheels, thus the higher jetting number

nikolt1

jets still seem high. I put the 65n and 38f in a calculator and it showed like 162 rwhp and 190 at the crank... Do NOS jets flow differently then other jets?

rskrause

Most kits come with recommendations that are too big on both the N and F jets. They do this so people will say their "100hp" kit makes more than 100hp, or whatever. Implying the superiority of one brand over another.

Rich

jakesz28

In my experience I have been able to pick up about 150rwhp on a .063 nitrous jet.


I also agree with rskrause as to why the kits come this way.

nikolt1

makes sense. So its probly not going to be a good idea to run .065n jets on a stock lt1. (boltons and 503 cam).

jakesz28

I've sprayed about 250 thru a stock, cam only short block. But I don't reccommend it unless your willing to replace it. But it should handle a .065 nitrous jet without a problem. Just make sure to pull some timing. How much depends on how much timing your running. Also remember that the ecm adds about 4* more then what is in your spark tables. I would start at about 28* total timing when spraying 150 hp shot.

nikolt1

k thx for the info guys. i'll be spraying it at the track this weekend

Joe B

One of the big reasons for the jetting size discrepancies (on the NOS kit's with the soft plume nozzle mentioned above) is because of the internal restrictions in the soft plume nozzle itself, which can create a weird jetting situation when you get up above even 100 HP......A long time ago, When I switched over from my NOS dry kit, to their wet system conversion that came with the soft plume nozzle... I was NEVER happy at all with the performance it had to offer in relation to my previous dry kit, regardless of the jetting......Even when jetted for the maximum 125 shot in the catalog (N65/F38, or F37, F36, F35, F34, F33)...which by the way, is rated "at the crank", and is NOT an estimation at the rear wheels like many of the other NOS brand kits).......I found on mine that any jetting changes made much larger than the 50ish range, were yielding VERY disappointing results........After getting fed up, I had my buddy cut it right down the center on his Haas CNC, so I could inspect (and mic) the internal passages inside.....Come to find out, (on the Nitrous side) the internal passage was only 52-53 thousandths.....I talked to NOS about this, and some said it should be around 80 thousandths and max out at about 140-150HP....Then I got some guy on the phone there, that said that (at some point) he heard that they decreased the passage size, so that people(idiots) would be less likely to incur engine damage even if someone "completely" left the jets out altogether,(which I actually witnessed someone do at the track with his, LOL).....Couldn't even tell a difference time wise with the way it ran, or hit, LOL)............Anyway, I made the switch to the 1/8th tap size NX Shark Nozzle, and it was like an entirely different nitrous system.........IMO (and experience), the NOS Soft Plume nozzles are ONLY good in situations where your gonna stay "well under" 100 crank shots, and where maximum fuel/nitrous atomization is a VERY large concern , as may be the case with some VERY small displacement engines (IE: 4-6 cid's)......which is what NOS actually designed it for....OR if the soft plume Nozzle is being used as part of a direct port system where your using one nozzle for EVERY separate runner..................Joe