Quote:
Originally Posted by twizdt
what is 12:1 FMU?
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"Fuel management Unit"
http://www.dsm-ezine.com/sleeper5_stage_1.html
The simplest way to add the additional fuel required is with a FMU . A FMU is
basically a second FPR(fuel pressure regulator) that is installed between the
stock FPR and the return fuel line heading back to the tank. As boost pressure
increases, the fuel pressure will increase above the set limit of the factory FPR
at an increment determined by the size of the FMU you are using. FMU's
generally are available in sizes ranging from 12:1, 10:1, 8:1, 7:1, 4:1, and 3:1.
The most commonly suggested size FMU to use on our car when using the
stock FPR and fuel injectors would be the 12:1 ratio unit (this isn't necessarily
the best choice, read on). What this means is that for every 1 lb. of boost
pressure, the fuel pressure will rise by 12psi above the static fuel pressure set
by the stock regulator.