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Pressure @ Fuel Rail

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Old Sep 14, 2006 | 07:07 PM
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Pressure @ Fuel Rail
Does anyone know what the pressure at the fuel rail is on a stock Evo 8?
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Old Sep 14, 2006 | 09:00 PM
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33 psi at idle
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Old Sep 15, 2006 | 08:04 AM
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Thanks. How high will it get at redline under full boost?
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Old Sep 15, 2006 | 09:14 AM
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The fuel pressure will rise at a ratio of 1:1 with boost pressure. This is done so that no matter what the boost pressure, the difference between the fuel pressure and manifold pressure will always be the same.
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Old Sep 15, 2006 | 11:14 AM
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Thanks. So you're saying that at 20psi i should be seeing around 53psi of fuel pressure?
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Old Sep 15, 2006 | 12:08 PM
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Originally Posted by djd24
Thanks. So you're saying that at 20psi i should be seeing around 53psi of fuel pressure?
You are pretty good at math!
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Old Sep 15, 2006 | 01:19 PM
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I know!...and...I didn't use a calculator
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Old Dec 16, 2006 | 06:00 AM
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is that 33 that same for a evo 9
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Old Dec 16, 2006 | 12:41 PM
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Actually it should be 43psi. At idle your pulling a vacuum so the pressure will be less. So if you running 20psi then your running 63 pounds of fuel pressure.

--Josh
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Old Dec 16, 2006 | 12:53 PM
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disconnect the vacuum line to the fuel regulator. you should see 3 bar fuel pressure.you disconnect the vacuum so that there are no external influences on the regulator .
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