Quote:

---

When you say "jet it up", are you changing the primary and secondary jetting? I currently have 75 in the mains and 78 in the secondaries....how many jet sizes should I go up with the 100 shot and how much more timing and jetting if I put the 150 shot to it, the system is the NOS Powershot. Should I be pulling my timing with a timing light and locking the distributer where I see fit or should I buy a timing computer.....money really isnt that big of a deal, swapping out chips instead of messing with my distributer seems easier and way more precise......any input on wich timing computer, I have all MSD now.

---

When NOS guys say jet up there usually talking about the fuel jet in the NOS system, not the carb. If your carb. is jetted good now leave it alone, jet up or down the NOS system gas side jet

Quote:

---

......I tried to buy a system from Monte but after sending 3 email requests for info and getting no responses I had to go another direction and that is why I chose a NOS system

---

That's odd.......It must have been going to junk mail.......He's really good about replying to emails and texts.......Hit him up tomorrow with a text or give him a call...256-783-3418

If it were me......52 nitrous jet is about 150hp....I'd put a 42 fuel jet with it at 5psi FLOWING...at least 100 octane fuel....and -8NGK plugs......I'd put the timing at 25* and work from there.........Keep leaning it out 2-3 numbers with the fuel jet until it stops gaining trap speed.....once that tops out, put timing into it 1 degree at a time until it stops gaining trap speed......you'll end up somewhere around 27*-30* depdending on what your quench is.......

If you want to run the 47 nitrous jet, start with a 37 fuel jet at 5psi......28* degrees timing.....stock plugs and pump gas will be fine.....start leanging it out from there and then creep timing back in 1 degree at time......you'll end up around 30-34*, depending on quench.......You want to run as little fuel and timing as possible to make it MPH the best......

Like mentioned, using a temp gun and setting the bottle temp at 92* is best.....using a water bath is a HUGE help.....The bottle needs to be a UNIFORM 92*........

Like already mentioned, too rich and too much timing are piston killers.......so, you need to get the tune CLEAN and then put timing into it.....As long as it doesn't detonate, you won't hurt it......There are three things that make a motor detonate.........Not high enough octane fuel for the cylinder pressure your motor makes, oil getting into the combustion chamber either past the rings, guides or intake gasket, or too much timing.........

Having said that, Monte can get you there much faster than doing it that way.....

Quote:

---

Thamks for all the advice guys, I truly appreciate it! I had the car dyno tuned , so I feel that the carb tune-up is right on. I have installed the pills as suggested by NOS for the 100horse shot and that is a 47N/53F. I have a 6AL so instead of buying components for that old style system I think ill just manually retard the timing. I do not have an assortment of fuel pills, is that something that I should purchase?

As far as my fuel system goes, I have the Holley "HP150" billet pump. that states its [Email]140gph@16psi[/Email] or up to 900 horses...I have -8 line feeding the engine dead-headed with 7 pounds to the carb and I have put a tee below the carb. reg to tap the fuel line and installed another regulator for the nitrous and set it at 6 pounds, I also have a low pressure swith in the line b4 any regulators and its set at 5 lbs., does anybody think when my fuel bowls need more fuel and the floats open that my main fuel line will go below 5lbs......that is the question

I have tried to post some questions on Yellowbullets nitrous tech with induction solutions, but I cannot register, they must have all the users the want. I tried to buy a system from Monte but after sending 3 email requests for info and getting no responses I had to go another direction and that is why I chose a NOS system

---

I Have a freind who has emptied many big 15 lb NOS bootles and burnt up a bunch of parts learning how to go fast with NOS, make your fuel jet the same size as your NOS jet to start with As far as the needles and seast put the biggest ones you can get in it, .120 vitons work well Set the fuel pressure a little lower with the bigger neeldes and seats, I use 5.5 lbs now with the .120 instead of 7.5 lbs with the .110 My car was running out of fuel with the .110 at 7.5 lbs, switch to the .120 at 5.5 lbs and the car slowed down due to being to rich, lean the jets down and the car ran a new best Test, test and then test some more

Quote:

---

make your fuel jet the same size as your NOS jet to start with

---

Only if you want a rich tune up out of the box with recommended fuel pressures for the system. If you have a wideband O2 sensor it will help a bunch!

Follow what Big Squeeze said and you'll be good. Want a 100 shot, about a .047 n2o jet and something in the .037-.040 fuel jet. Ask Monte if you get hold of him about a good baseline jet package. Even the new/revised kit recommendations are still fat. The old 150hit n2o/F was .063/.071, new is .063/.063. The new 100 hit is .047/.047, still fat. A general guideline is if your fuel jet is same or larger than you n2o jet, it's a FAT tune up.

I'm might be doing a 100 shot on my car and it's going to be .047/.039 to start with as far as plate jetting with 6PSI fuel pressure. If I jump to a 150, .063/.053 to start.

Why I wrote bump timing it 2* at a time, must have had setting initial on my mind... Do 1* at a time. I think NOS says 2* per 50hp and then an additional 2* safety margin. Better to take a bunch of timing out and not hurt it than not enough and cayse issues. Just like the plate jetting, sneak up on the best combination.

Quote:

---

..........make your fuel jet the same size as your NOS jet to start with .....

---

ANYTHING that is square jetted is going to be FAT........You can easily and safely go AT LEAST 10 numbers smaller on the fuel jet even with a small tuneup, AS LONG AS THE TIMING is back where I'd recommended......