Stand alone pump

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Nov 22, 2008 | 04:17 PM

badaSS346

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From: NJ

Stand alone pump

How much psi does a stand alone fuel system need for a 150-250 shot. (150 on current motor and 250 after build but only want to buy 1 pump)?

Nov 22, 2008 | 06:27 PM

Nick@HSW

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You can run whatever psi you'd like to. Just make sure the pump is capable of flowing the volume of fuel you require.

Nick

Nov 22, 2008 | 07:11 PM

TurboAv

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I called Nitro Dave's the other day and was discussing stand alones and he said for direct port stuff a lower pressure system is easier to tune. Not sure about a plate system though.

Nov 22, 2008 | 07:35 PM

Nick@HSW

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Quote:

Originally Posted by TurboAv

I called Nitro Dave's the other day and was discussing stand alones and he said for direct port stuff a lower pressure system is easier to tune. Not sure about a plate system though.

Which plate?

Nick

Nov 23, 2008 | 12:10 AM

TurboAv

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From: Tonopah, AZ

Quote:

Originally Posted by Nick@HSW

Which plate?

Nick

I was just saying that I don't know if lower pressure is easier to tune on a plate since we were discussing direct port systems and not plates.

Nov 23, 2008 | 10:54 AM

Nick@HSW

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Gotcha, feel free to shoot me over a PM if you'd like to discuss any options etc. Thanks.

Nick

Nov 23, 2008 | 06:05 PM

badaSS346

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From: NJ

Quote:

Originally Posted by Nick@HSW

You can run whatever psi you'd like to. Just make sure the pump is capable of flowing the volume of fuel you require.

Nick

how does one figure that out?

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Nov 24, 2008 | 11:43 AM

TurboAv

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From: Tonopah, AZ

Quote:

Originally Posted by Chris@NitroDaves

You can tune the plate with low pressure just as you can with a direct port.

-Chris

What makes low pressure easier to tune?

Nov 24, 2008 | 11:52 AM

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badaSS346

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From: NJ

So for say a 250 shot...what does the pump have to flow....50...100...150 gph?

Nov 24, 2008 | 12:22 PM

#11

Nick@HSW

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From: Glenolden, PA

Quote:

Originally Posted by badaSS346

So for say a 250 shot...what does the pump have to flow....50...100...150 gph?

Multiply HP by brake specific fuel consumption value of .6. Convert to gph by multiplying by .26. Use .6 as your value as you can never have enough pump.

Nick

Nov 24, 2008 | 12:24 PM

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Nick@HSW

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Quote:

Originally Posted by TurboAv

What makes low pressure easier to tune?

Jet selection and flow. Think of it this way, how is 1 jet size going to react to 60psi versus 6.

Nick

Nov 24, 2008 | 12:41 PM

#13

badaSS346

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From: NJ

Quote:

Originally Posted by Nick@HSW

Multiply HP by brake specific fuel consumption value of .6. Convert to gph by multiplying by .26. Use .6 as your value as you can never have enough pump.

Nick

ok so 250*.6=150
150*.26=39

So i need a pump that flows at least 39 gph?

That sounds way to low.

The way I figured it out is that if for 600 rwhp you need 255 gph and 250 hp is 42% of 600...then you will need 42% of 255 which is 107 gph.

Nov 24, 2008 | 01:39 PM

#14

Nick@HSW

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From: Glenolden, PA

Quote:

Originally Posted by badaSS346

The way I figured it out is that if for 600 rwhp you need 255 gph and 250 hp is 42% of 600...then you will need 42% of 255 which is 107 gph.

Take into consideration that you didn't convert 255lph to gph. So using your math you would take 42% of a pump that flows 66.3gph (255lph pump). That comes out to roughly 28gph. I would take a harder look at the bsfc calculation rather than using a percentage rational. And keep in mind that the walbro pumps aren't all the same and most of them are a little deceiving in the actual amount that they flow.

Nick