Some one please expain the fpr shim mod?? - Ford Powerstroke Diesel Forum
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Old 06-15-2011, 06:22 PM
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Some one please expain the fpr shim mod??

Been searching and cant find any instructions on it. What does it do exaclty?

most helpful ive found
fpr shim and air cleaner mod - Ford Truck Enthusiasts Forums

Also whats the BB mod??
Help!

Thanks!
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Old 06-15-2011, 06:24 PM
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i already have a AFE Stage 2 Proguard 7 filter?
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Old 06-16-2011, 11:44 AM
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Interested as well.

How does it work with a chip?
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Old 06-16-2011, 02:05 PM
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It bumps your lift pump fuel pressure up....HOWEVER i've seen alot of issues when you throw in stage 1 + injectors running the fuel pressure over 100psi ALWAYS check your fuel pressure at ALL RPMS to make sure you don't exceed 70psi. The way you do it is you'll see a 19-18mm brass bolt on the driver side of the fuel bowl. Remove that bolt and it will expose a spring behind the spring is a plunger that allows fuel to bypass when the fuel pressure over comes the spring. Remove the plunger, place a SS BB for a bb gun between the spring and plunger. This increases the spring pressure allowing it hold more pressure in the heads.Done right it will increase fuel pressure to the injectors allowing a little more fuel in to increase power. With a chip you will see an increase in smoke and a little more power.
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Old 06-16-2011, 06:37 PM
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Is there a way to check the fuel pressure without a pillar mounted fuel pressure gauge?
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