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Old 05-21-2020, 10:25 PM   #1
panel
Scooby Newbie
 
Member#: 352704
Join Date: Apr 2013
Chapter/Region: VIC
Location: Victoria , B.C. Canada
Vehicle:
1965 Vw panel bus
with an EJ20 Turbo Swap

Default Advantages to adding an adjustable FPR ?

I was wondering what some of the advantages to adding/upgrading to an adjustable fuel pressure regulator was. If it was adjusted back to the baseline of 43.xx PSI then why upgrade etc. Or for that matter what advantages are there to upping the PSI to 45 + psi etc ?
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Last edited by panel; 05-21-2020 at 10:30 PM.
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Old 05-21-2020, 10:44 PM   #2
viper_crazy
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Member#: 298403
Join Date: Oct 2011
Chapter/Region: W. Canada
Vehicle:
2008 WRX Premium
Spark Silver

Default

Higher fuel pressure means higher flow rates through the injectors. When shopping for injectors, you'll see a flow rate @ 'x' psi. You can effectively increase/decrease that flow rate with with a higher/lower pressure.

Keep in mind that you'll need some fuelling adjustments in the map done if you stray from stock pressure.

And you're not entirely wrong on your conclusion. Why upgrade if it's staying stock? You could be future proofing your build.

Say you selected a 1000cc injector and discovered on the dyno you need just a smidge more to reach your goal and the injectors are already maxed (IDC's are getting close to 100%). Turning up the fuel pressure will not only help you get that extra 10 hp you're looking for, but will also reduce IDC's.

Keep in mind, if you decide to get an AFPR, an uprated fuel pump will be necessary because the pressure is also pushing back on the fuel pump. The stocker likely won't handle it depending how much the pressure is increased.
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Old 05-24-2020, 11:30 PM   #3
panel
Scooby Newbie
 
Member#: 352704
Join Date: Apr 2013
Chapter/Region: VIC
Location: Victoria , B.C. Canada
Vehicle:
1965 Vw panel bus
with an EJ20 Turbo Swap

Default

Good explanation , thank you.
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