Some one please expain the fpr shim mod??

[s.hiles]

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!

[s.hiles]

i already have a AFE Stage 2 Proguard 7 filter?

[mjonesjr]

Interested as well.

How does it work with a chip?

[96F350KID]

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.

[mjonesjr]

Is there a way to check the fuel pressure without a pillar mounted fuel pressure gauge?