STI Fuel Rail

So yesterday I got a hand of a 04 Sti fuel rail. I notice that my LGT fuel rail has some sort of filter attached. Unlike the Sti's has none.

My question is what is that plastic thing on my fuel rail? Looks like the Sti fuel rail might have a better fuel flow due to the lack of that plastic thing. Can I swap it?

FYI, that not a filter. It's a Pulsation dumper assembly,

http://opposedforces.com/parts/legacy/us_b13/type_5/intake_and_supply_system_turbocharger/intake_manifold/illustration_3/

http://forums.nasioc.com/forums/showthread.php?t=1742406

Quote from thread above.

The dampers keep [ame=http://www.amazon.com/s/keywords=fuel%20pump&index=automotive]fuel pump[/ame] pulses to a minimum if a pulse...think of a wave, here..... has the valey of a pulse 'hover' over an injector....that injector may not spray fuel properly....and p0p goes the motor fuel pressure in the system is like AC power and the dampers smooth it out more like DC power.

strohausii

In industrial applications they use "pulsation dampeners" to minimalize stress, hammer, and cavitation generally located close to the source (think oil well pumps that look like a diesel enginehttp://images.intellitxt.com/ast/adTypes/icon1.png connected to a drum barrel electric motor) . You can actually buy "hammer arrestors" at the big hardware stores for your home plumbing, or just do what plumbers have done and create standpipes (trapped pockets of air).

Fluids are practiacally uncompressible so pulses are transmitted very well, think Tsunamis.

Hammer/ pulsation is to hydraulics what knock/ detonation is to engines, and quite similar.

I would think that the in-line fuel filter would act more as a flow restrictor creating some minimal level of pulsation dampening unless it is truly designed with an internal feature for dampening as the devices I've described above.

Mike

Are your injectors not getting enough fuel?

I see zero need to improve flow unless you've upgraded your injectors to exceed the stock fuel rail capacity.

Thanks for the info Hammer Down!

Actually I was having the rough idle and a CEL with the mysterious P000 code. The real problem was the injectors! I guess mine are out at 160k miles.

Last week I bought a set of injectors from a girl that took them off her 04 Sti. Now the engine is running as silk and no more CEL

The fuel rail was just a curiosity.