S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

what is the fuel pressure?

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Old 02-20-2003, 06:20 PM
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Default what is the fuel pressure?

what is the fuel pressure in a stock S4?
i just got a furl pressure regulator and adjuster and i want to set mine up and i dont kno where to put it, when i got it it was at 40 psi and i felt my car losin power, i think its becuase its running too rich, anyone have any ideas?
Old 02-20-2003, 06:32 PM
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Default Your car is losing power because 40PSI is too low of a fuel pressure.

FPRs on S4s are rising rate, not static but 4 bar is the max rate. You need to at least provide 58PSI of fuel pressure.

Why are you messing with fuel pressure anyways?
Old 02-20-2003, 06:37 PM
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I'm curious, what do you mean by rising rate? How is it controlled, manifold pressure?
Old 02-20-2003, 06:47 PM
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Default Not sure if it is manifold pressure...

but fuel pressure rises as boost pressure increases up to 4bar.
Old 02-20-2003, 06:53 PM
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Thnx
Old 02-20-2003, 06:57 PM
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Default Re: Your car is losing power because 40PSI is too low of a fuel pressure.

i stuck in the fuel pressure regulator to be safe and then i started to drive and i hit it and it felt hella slow.
Old 02-21-2003, 05:28 AM
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Default Why did you replace the stock unit?

If you have it too lean, you will do damage to the engine.
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