TECH: The Fuel Pressure Dampener

[Prometheus]

A few things.

It would be interesting to see fuel injector transition maps of a stock fuel delivery system before and after F.P.D. deletion.

It would nice to compare those transitional maps to maps of a modified fuel system. I assume the transition between larger injectors would be more radical due to their larger volume.

Steady fuel delivery means more perdictible tuning.

I'm sure a faulty F.P.D. has been the source of tuning headaches in the past, and will continue to be untill an alternative has been brought to the table.

Since the original design is pretty lame, we should devise a plan or test to manufacture an aftermarket F.P.D. or see if possibly adding more than one F.P.D. would help smooth out the primary/ secondary transition, if there is even a problem at all (which I'm sure there is)

[Cp1]

Originally Posted by Prometheus

Since the original design is pretty lame, we should devise a plan or test to manufacture an aftermarket F.P.D. or see if possibly adding more than one F.P.D. would help smooth out the primary/ secondary transition, if there is even a problem at all (which I'm sure there is)

I really dont see even an aftermarket option being a cost effective solution to a non problem. if your fuel pump is in good working condition and your pressure regulator is working properly you should not ever have such a condition that would call for the dampener. the miniscule benefit it may provide in my belief under transition is not worth the cost or development of a bigger/better unit, when simply plumbing your fuel system in "parallel" as opposed to in "series" would eliminate the need for it altogether.

I understand why mazda may have put it there in the first place but its benefit is very little on even a stock fuel system. sooner or later it simply becomes a hazard not to mention the most restrictive and weakest part of the whole system.

Btw since i first wrote this article my FPD has been eliminated and i have noticed no difference whatsoever. there is no lean or leaning conditions during injector transition that even my wideband datalogger could detect. I have no data suggesting that eliminating it has somehow affected any performance negatively or anything else for that matter. there is no problems, no difference i can tell and best of all no worries since i took it out.