[LFD2037]

If you get an MP-8 you will have to shim, or get a plug, for the fuel rail. You will get 2 or ore codes if you don't.

 

[dr.olds4554]

If you get an MP-8 you will have to shim, or get a plug, for the fuel rail. You will get 2 or ore codes if you don't.

ok, would it benefit me any to shim the rail with my stock fuel set up? When I run it out wide open after opening up the intake horn and heat grid the same size as the gasket it makes like a hit and miss grinding noise. thanks.

 

[LFD2037]

IDK about the edge but even w/factory fueling w/the MP-8 you will need to. The hit & miss may be the rev limiter but IDK what the grinding sound would be.

 

[warlock06]

shim it while your there, cant hurt, but i dont recommend plugging it, then there is no fail safe

 

[dr.olds4554]

shim it while your there, cant hurt, but i dont recommend plugging it, then there is no fail safe

okay, thanks. I saw somewhere in the forums how to shim it with washers. Know where that's at? thanks.

 

[LFD2037]

It's in the 6.7L tech section.

 

[ksseabrd]

Shimming and plugging are basically the same thing.

Technically when shimmed, the FRV can still release pressure, but the pressure would have to be VERY high, probably well over 30-35K. Your fuel system will never get there. And if it got close, most likely something else would fail first.

The plug cost more, but is quicker to install, and no chance of messing up your FRV. Plus you still have your FRV if you need it.

Also, if you damage or loose anything on your FRV, when shimming, they are $400 + from the dealer.

I plugged mine.