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Old 02-14-2006, 11:44 PM   #1
SubyDan05
Scooby Newbie
 
Member#: 92860
Join Date: Aug 2005
Location: New Hampshire
Vehicle:
02 wrx
yellow

Default fuel pressure regulator?

when do i need a fuel pressure regulator? i am planning on upgrading my injectors and fuel pump, and do i need the fuel pressure regulator? or can i upgrade the injectors and just get a fuel pressure regulator? i have a few mods and utec. please help me out. thanks
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Old 02-15-2006, 07:46 AM   #2
Kha0S
Scooby Guru
 
Member#: 8808
Join Date: Jul 2001
Chapter/Region: NESIC
Location: WRJ, VT
Vehicle:
2011 WRX
DGM 5D

Default

The stock RRFPR is commonly used with upgraded pumps and new injectors to get higher fuel flow for turbos larger than stock.

For mildly aggressive tunes using a stock turbo, you still might find yourself running out of headroom in the stock fueling system. I'm running a stock TD04, and I'm seeing injector duty cycles over 90% from 5000RPM to redline. With an upgraded fuel pump (the 255lph high pressure pump) and an FPR at 10psi higher static pressure, I expect to get an additional 15% or so of headroom on my injectors.
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