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Old 08-05-2020, 10:43 PM   #1
Haevn
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Member#: 495950
Join Date: Jan 2019
Location: Augusta, GA
Vehicle:
2011 WRX
WRB

Default question about fuel and fuel psi

ok so here is my setup. BNM ELH with ewg up pipe, 44mm ewg, fp blue with port and 84mm housing, fp inlet, cobb sf intake, 1050x injectors, cobb fuel pump, TBE, torque solutions tgv deletes, torque solutions fuel rails with -6an lines, aeromotive FPR. i do have the cobb fuel pressure sensor to log with ap, now here is my question. i just noticed on my last log that my fuel psi goes up to about 62-63 psi cause i am running around 21psi of boost, but at the top of the rpm range around 5500 rpm the fuel psi starts to drop down to 55psi at 7k rpm. my afr during pull stays around high 10 low 11. would changing to -6 lines cause my pressure to drop a little since it is bigger lines for feed and return going back to the stock hard lines at the firewall? i am on parallel setup now.

here is link to log thanks much

https://drive.google.com/file/d/1vkh...ew?usp=sharing
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Old 08-06-2020, 12:47 AM   #2
viper_crazy
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Member#: 298403
Join Date: Oct 2011
Chapter/Region: W. Canada
Vehicle:
2008 WRX Premium
Spark Silver

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I can't view the logs because I need to request access.

Does your boost pressure taper at higher RPM's? If you have a 7 odd psi boost taper closer to your redline, your fuel pressure would drop by that much. That's my first thought.
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Old 08-06-2020, 09:01 AM   #3
Haevn
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Location: Augusta, GA
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The boost holds 21 pounds all the way to red line
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Old 08-06-2020, 11:57 AM   #4
Haevn
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Join Date: Jan 2019
Location: Augusta, GA
Vehicle:
2011 WRX
WRB

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Ok I changed permissions on file
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Old 09-11-2020, 07:11 PM   #5
Haevn
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Location: Augusta, GA
Vehicle:
2011 WRX
WRB

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bump, just to see if anyone else able to help me out with this, thanks
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