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BPC formula for raised pressure?

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Old 03-01-2011, 08:52 PM
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BPC formula for raised pressure?
Okay I've been looking everywhere and I can't find the formula to calculate BPC for a RAISED fuel pressure on a TBI. Can someone please post up the formula???

I know that this is the basic BPC calculation formula

BPC = 1461.5 * (cyl size / gm/s of fuel)

BUt can someone please tell me the formula for altered fuel pressure.

Thanks.
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Old 03-02-2011, 03:12 AM
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Re: BPC formula for raised pressure?
Visit fullsizechevy.com and take a look at the sticky in performance on getting enough fuel to support your horsepower. It has a great tutorial on how changes in fuel pressure change flow values on injectors.
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Old 03-02-2011, 07:45 AM
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Re: BPC formula for raised pressure?
Originally Posted by Cdeez
Okay I've been looking everywhere and I can't find the formula to calculate BPC for a RAISED fuel pressure on a TBI. Can someone please post up the formula???

I know that this is the basic BPC calculation formula

BPC = 1461.5 * (cyl size / gm/s of fuel)

BUt can someone please tell me the formula for altered fuel pressure.

Thanks.
Just need to calculate the new flow rate with the increased fuel pressure. Then use that value in the formula you posted.

NewFlow = OldFlow * (SqRt(NewPsi / OldPsi))

RBob.
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Old 03-04-2011, 03:35 PM
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Re: BPC formula for raised pressure?
Originally Posted by RBob
Just need to calculate the new flow rate with the increased fuel pressure. Then use that value in the formula you posted.

NewFlow = OldFlow * (SqRt(NewPsi / OldPsi))

RBob.
That's exactly what I was looking for, thank-you RBob. I had that formula for calculating new flow saved with my other notes on tuning but the computer they were saved on bit the dust recently.

Thanks!

-deez
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