So for you spray users.. I gotta question, if you know.. does a 50 jet, actually compute to that, or is the shot actually greater or smaller.. I just was thinkin' about it, and I wasnt able to work out if a 50 jet on a v-8 engine, and a 50 jet on a 4 cyl. would still be 50 for either.. scince they are sold only as rated jets, and not rated jets for the application.. Thanks!

I do understand the jet rating, is at best a scientific guestimate, but i'm looking for a better idea on what jets will do what on our 4cyl's.

 

in a word, not really. you must also compute in tank pressure,temp and amount of fuel.
the jetting for nitrous settings are all guesstimates and approximations
when I first set mine up the jets for a 50 were too much ( fresh,warm tank, not enough fuel) she ran like poop.
second set up with a 35 jetting just right ( warm tank,proper fuel, proper plugs) does an 80 to 120 mph jump in a little over 3 seconds. :D

 

okay.. perfect.. thanks!

what plugs did you wind up using?

 

you can get away using anything but iridium and platinum.

both have a tedency to have a bad chemical reaction to the nitrous. they burn too hot as well. I use just plain old copper ( stock) plugs 1 step colder when I know I'll be juicing.

Zex has plugs they recomend , OBX ( eeewwww) does have 1,so do most of the other companies that have kits out.

but plainold copper works best for me, you just change them more often , like you change your bottle so changer your plugs.

 

I use ngk iridium plugs with a 50 shot and it's awesome. I also run 91 octane gas, and so far it's been no problem. zex wet kit.

 

awsome.. thanks!!

 

i was told not to use iriduim plugs with nitrous by my engine guy. i didnt ask why, cause he knows more than i do

 

platinum plugs have a chemical reaction with the nitrous.anyone reading this have an rc car that runs on nitro? anyway the reason for non-platinum plugs is a reaction similar to the glow plug ( coil made of platinum reacts with nitromethane causing heat/spark to make the engine run)

same with iridium , so you wouldn't want that reaction in your engine (, pre-ignition with the nitrous ) causing unwanted effects.

simply put knocking and pinging leading to premature engine failure.

 

platinum plugs retain a lot of heat in a very small "hot spot" which gives better performance and mpg under normal circumstances but it will preignite a NOS mixture. iridium plugs do not do this, and in fact they are recommended over stock for nitrous.

I also run a 250 shot in my dodge ram srt-10 (viper engine) with the same iridium plugs. I had problems with the stock plugs and even had a decent nitrous backfire which blew my intake airbox apart!

the problem was fixed by putting in the iridium plugs (2 steps colder also)

 

=/ From being a little nitrous happy I ended up going to a shop down here in florida, it was run by a bunch of older muscle heads.. all had old gto's or camaro's on HUGE shots of spray.
I kinda took this from them... Stock plugs or NGK plugs work the best..always a step or two colder then stock. The safest way for the average car person is to run a wet shot.. I had the best results and always felt a little safer..running the wet shot with a richer fuel jet. kinda elimiates some of the doubts of going boom. lol.
Colder plugs + spray + rich shot of fuel..and probably run 93 oct too... that does help a little.

 

A 50 shot? that's a bit too small, you need 75 or more.

 

ummmmmmm yeah if you want to buy a new engine

 

i didn't go over a 50 shot in mine due to the tiny sized rods.