im running a Vic EFI manifold on my LT1 and and going to be spraying it with a 200 shot. i want to go with a high pressure system because a) its safer and b) it should atomize better. the only thing that im trying to figure out is how to jet it. the jets are made for running around 6lbs of fuel pressure and im going to be running closer to 40 (can go lower or higher if needed). so how do i figure out what fuel jets to use to compensate for the higher fuel pressure?

 

Low pressure is actually "safer". It allows you to have more adjustability.

 

i meant safer in that a 1psi drop with high pressure is no big deal but with a low pressure mean running super lean

 

Just call your nitrous company and ask them for high pressure jet settings.

 

Eh... Assuming we're talking about two electric pumps (one high press and one low press), the drop in pressure is going to be somewhat proportional to the drop in voltage (I assume that's what you're worried about).

So a 1psi drop on a 40psi system may be only a .1psi drop on a 5psi system. I'd still take the low pressure system.

If you're totally set on high pressure. Do what AChotrod said.