delete fuel pressure reg/ or flash ecu/ which is better

[sideways24d]

we are having an argument

if you took your fuel pressure regulator out, completely and plugged the return line, would that be better than flashing the ecu to give more fuel. Your injectors will only put out so much, so if you increase line pressure will they put out more than an ecu that is reprogrammed to to the same thing? By the way, this is swithcing the exhaust cam from a 91 with the intake cam on say a 95. Which would be better for optimum performance and reliability?

[krazydriver]

don't do it.

if you took your fuel pressure regulator out, completely and plugged the return line........Your injectors will only put out so much, so if you increase line pressure will they put out more than an ecu that is reprogrammed to to the same thing?

Fuel pressure regulator is vital to maintain proper fuel pressure. Without it you will send too much pressure to the injectors and they will either be unable to open from the pressure or will be injecting WAY too much fuel. Also possible causing fuel leaks if your lines decide they can't handle the pressure... and probably blowing out your fuel pump because it will have to work so hard to pump.

Don't remove the FPR vacuum line either. It's purpose is to increase the fuel pressure as intake manifold pressure increases (19-22 vacuum to atmospheric 0)

Newer cars have a deadhead system where there is no fuel return line. However people with that usually end up making their system a return fuel system because otherwise they can't change the fuel pressure for tuning reasons.

So just don't do anything to the fuel system in your car.

[neverlift]

this is a joke?

your pump will die as well as your stock injectors, they should not be pushed past 55 or so psi, the open/close mechanism wont be able to work. But thats not the real issue, the stock fuel lines are not up to task, have you looked at the lines/clamps its a joke. the ecu "reflash" as you call it would be better. It actually would have some control over pulse widths and how big they are.... so one of you is WRONG. You dont need to up your pressure or have a reflash for a cam change, I'm on a stock afm and injector at 6psi, my pressure is at 58 without vac(adjustable fpr and walbro), stock pump isnt able to go over 60(I tested the theorymaybe just my pump lol), well it could but life would be VERY short. I dont think my fuel pressure is why I'm able to run 6ps(safe said the plx), its in the ecu tune I made... (higher pulsewidths)

[Fla240sx]

I don't even know where to begin with this question...

just leave your car how it is now haha

[sideways24d]

Thanks guys. The guy I was talking to assured me that it would work and I argued against it for an hour. One of those drunkin conversations that I knew I was right but he just wont let up on it. If you want more fuel, you need a high flow pump, depending on how high/ new lines, bigger injectors, and prolly a reflash so your ecu knows what and why this is going on.

P.S. he is not a nico club member nor has he takin nissan specific training like I did. You guys just help me prove my point. Thank you again. I love this forum

[neverlift]

Thanks guys. The guy I was talking to assured me that it would work and I argued against it for an hour. One of those drunkin conversations that I knew I was right but he just wont let up on it. If you want more fuel, you need a high flow pump, depending on how high/ new lines, bigger injectors, and prolly a reflash so your ecu knows what and why this is going on.

P.S. he is not a nico club member nor has he takin nissan specific training like I did. You guys just help me prove my point. Thank you again. I love this forum

well stop having car conversation while drankin lol j/p

yeah after you slap bigger injectors I'd say you need a re tune or at least an afc of sorts, the walbro and bigger lines will mainly just ensure fuel is present at all times. but I'd agree slightly more fuel will get thru...

[sideways24d]

no doubt that more fuel will get through, but without messin anything up I highly doubt it. I think he meant that he could do that and keep it that way. For sure it's not going to be long at all till your injectors, rail, or pump go because the system just wasn't designed that way. Something about the cam makes the difference he was sayin. yeah the cam would make the difference but you would need to keep the regulator as well. I don't know if I should tell him or let him figure it out himself cause he plans on doing it to his 91.You live and you learn I guess