Ls1Gummi

iTrader: (2)

between spraying at 50psi vs spraying at 20,30, or even 10psi with a dedicated fuel system???

Sigforty

The fuel jet sizes. Also in order to spray higher HP shots you tend to run the lower fuel pressures.

Ls1Gummi

iTrader: (2)

I dont undertand. Lets just say i were getting fuel from the fuel rails instead, well thats 50-60 psi there. The solenoids dont know where the fuel is coming from. So whats the diffrence??

TARZAN

iTrader: (12)

Generally speaking, its not the solenoids that regulate how much fuel is sprayed, its the jet size. If you have less fuel pressure, you'll need larger fuel jets.

-Will

Mike@HSW

iTrader: (6)

Certain nitrous kits are designed for high or low fuel pressure. Some EFI kits out there will just not perform well on low pressure. Now if you are talking about a direct port there can be a few reasons and differences. On smaller shot sizes you need to run a VERY small fuel jet, as a result of this its easy to clog a jet. If one nozzle gets clogged and cuts off fuel flow, it could be a very bad day for that cylinder. So to avoid this you run low pressure which will yield a much larger fuel jet. Low pressure on a DP also makes fine tuning a direct port a lot easier.

Sigforty

I think everyone else pretty much explained it.