Now whats the difference....

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Mar 30, 2009 | 09:35 AM

Ls1Gummi

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From: Sugarland,Tx

Now whats the difference....

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

Mar 30, 2009 | 10:13 AM

Sigforty

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

Mar 30, 2009 | 10:17 AM

Ls1Gummi

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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??

Mar 30, 2009 | 10:34 AM

TARZAN

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Quote:

Originally Posted by Ls1Gummi

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??

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

Mar 30, 2009 | 11:44 AM

Mike@HSW

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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.