do i need an aju fpr
- Thread starter murphmaster5
- Start date
it's nice to have one but you need a gauge as well to know what your fp is set at. I'd reccomend a Kirban ajfp gauge. Pretty much the best stock-style gauge made
srothfuss
Last night I stabbed the same guy 7 times in a row
The stock unit keeps the pressure around 38 - 39 PSI. If you get an adjustable one, set it at that....
Which leads me to my thought: Why replace a part on the engine with one that will do the same thing? I mean, if the OEM unit keeps the pressure where it needs to be, than what good is an aftermarket one that does the same thing?
Which leads me to my thought: Why replace a part on the engine with one that will do the same thing? I mean, if the OEM unit keeps the pressure where it needs to be, than what good is an aftermarket one that does the same thing?
srothfuss said:
This is a topic that has been debated over and over. Some say they aren't necessary at all, but others say they are needed. I like having an ajfp regulator because it has helped me with getting my car to idle right.
It has to do with pulsewidth and atomization of fuel and a bunch of other stuff that is waay over my head. From what I read, it's more of a tuning band-aid to make smaller injectors seem bigger, but that really means that you need bigger injectors which will bring that fuel pressure back to stock. There are some pretty crazy threads on the corral about this topic.
srothfuss
Last night I stabbed the same guy 7 times in a row
I see.... Maybe for boosted applications? Or High Horsepower needs.
I never venture outside of Stangnet so I really don't know.
I never venture outside of Stangnet so I really don't know.
Michael Yount
Mustang Master
First - are you speed density or mass air?
If mass air - get a gauge first. If your stock fpr is holding pressure right around 38-39 psig at warm idle with the vacuum line off the regulator and plugged -- then no, you don't need an adjustable unit. If it's not -- get an adjustable and set it at the stock pressure as described above.
If you're speed density, you may find that you can do some tuning with fuel pressure -- but I don't think SD is gonna like your cam choice in any event. Also - messing with fuel pressure is about the only way to try and make the 24's work unless someone who knows what they're doing is gonna burn a chip for you. So if you're SD - the E cam and the 24# injectors present some real challenges...
If mass air - get a gauge first. If your stock fpr is holding pressure right around 38-39 psig at warm idle with the vacuum line off the regulator and plugged -- then no, you don't need an adjustable unit. If it's not -- get an adjustable and set it at the stock pressure as described above.
If you're speed density, you may find that you can do some tuning with fuel pressure -- but I don't think SD is gonna like your cam choice in any event. Also - messing with fuel pressure is about the only way to try and make the 24's work unless someone who knows what they're doing is gonna burn a chip for you. So if you're SD - the E cam and the 24# injectors present some real challenges...
i figure a new part can always help unless its so off key its just not right.. but i just put mine on today.. getting ready for the lower intake. But i figure it being new will help flow and its new and clean.. new gaskets and everything. Also having the ABILITY to adjust it is whats the point.. you may need it someday and if you dont have it.. you have to wait till you get one
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