Are there a calculator out there for this?

I cannot go lower than 7psi and dont want to go higher than 900 psi on Nitrous.

I need 100, 150, 225hp jets.

So there isnt so much help in this topic.

With stock jets im so fat that its hard to rev freely. But i dont want to jet down without a clue.

www.koehlerinjection.com (http://www.koehlerinjection.com) has a program that will help with theoretical jetting/fuel pressure/bottle pressure but be careful - all jets with the same number on them will not necessary flow the same lbs/hr so be careful.

To much money to spend. Are there any formula out their if i do the math by myself?

you can do the math but it is not simple! Do some reading on gofastzone.com and search for tuneups on there - some people share theirs on that site.

But be careful, not all solenoids/jets flow the same so what might work for them might be dangerous on yours!

You would be best off to have your system flowed by Koehler or Applied (www.appliednitrous.com).

Living in sweden so i guess thats out of the question.

Will read their info.

Why can't you go lower than 7? you should be at 5psi.

Using a BG220HR pump and a return-style BG regulator.

I use AN10 and AN6 return. Cant go lower than 7 ,(