Wet nitrous jetting, who has a chart or formula?

[chevota]

I've looked high and low, ordered nitrous books, wrote NOS, Zex, etc, but no one will offer a jet chart beyond the jetting that comes with a kit.
I need info based on these factors: HP (obviously), fuel pressure, and nitrous pressure. I’ve collected data from various online sources to get a feel, but their numbers are so different it doesn't even make sense.

I can’t use generic jetting because the fuel pressure is higher than normal in my efi car (55-60), but lower than normal in my carbureted car (3). On the other hand, bottle pressure in the first car will be low, the second high. 60-70 degrees vs 80-100+

Neither are Mitsubishi, but you seem like an experienced bunch so I decided to ask here.

Thanks guys...

 

[DSMJim]

A good place for specific nitrous information is www.noswizard.com then click on bulletin board he knows a bunch and may be able to give you the specific formula that your asking for.

 

[chevota]

Thanks, but I surfed that site a few weeks ago. They don't seem too friendly to NOS users over there, and to complicate matters it seems they use a different jet measuring system over there, probably that new fangled matix system I heard about back in the 70's.
I don't just want the size I need today, I want a chart or formula to figure jetting for tomorrow too. I'm not going to call NOS every time the temp changes etc. I'm hoping there will be someone here who knows. What's fuc#ed is NOS and the other companies have this info, but they won't share

 

[DSMJim]

To be perfectly honestly I dont know if you will get the info your looking for here. I know of this formula however do not know what it is.

As a group of car enthusiasts DSMers typically run fairly low nitrous shots because were such heavy turbo users so the standard jetting plus slight compensation for a positive manifold pressure are about all we need to watch out for.

 

[90GSX]

This website may be useful:

http://www.robietherobot.com/NitrousJetCalculator.htm

Good luck,

 

[chevota]

90GSX: Thank you!!!!!!!!! This is a great help!

 

[red devil]

This site here is great

http://www.diy-nitrous.fsnet.co.uk/nitrous-fuel-jetting.htm

For conversion to decimal versus metric, just multiply the metric by .3936 to get the american jet size.

I found this chart very helpful in making my own jets and setting up my system. I started with a whole 18 hp shot to be safe and have worked my way up to a 60-80hp shot (god only knows what it really is producing)

I joined this forum just for the nitrous info. I own one of them damn old scubbies.

Have fun and keep the craving for HP under control!

 

[chevota]

I plugged in some factory NOS numbers into this program: http://www.robietherobot.com/NitrousJetCalculator.htm and it suggested very different fuel jets. Now I'm confused again.
Red devil: Thanks for that link too. I have a headache now from all this figuring and comparing data. Jeeeze!

Originally I tried a 24 fuel and 42 nitrous in my efi car (3.2 V6) and was dissapointed. Yesterday I drilled the 42 to 46 and it made quite a difference, so I must have been too rich. I ran it about 4 times for no more than 5 seconds each and didn't hear anything bad, so for now it stays. A plug check/change is in order. It's got platinum with a long ground strap right now, and from what I've read that's double bad. But since I didn't heard any ping then I'm probably in fairly good shape mix wise.

Thanks for your replies, I really appreciate it!

 

[red devil]

When you were "dissapointed", did the car feel real boggy? I had the same results when i was running rich.

 

[chevota]

It felt completely normal, except it wasn't the 75 boost I was expecting, more like 30. A guess I admit, but it was no 75 shot. When the bottle started going empty I couldn't feel anything unusual except less and less power. Then I tried squeezin with the nitrous off to see what that felt like. Again, felt normal, but lost a few ponies over stock. I must have made smoke, but I couldn't see it the the mirror. Weird, I would think it would roll over and die being that rich.