Okay, how can i kill my boost.

[C-Kwik]

To add on, the reason it won't do anything is that the FPR is designed to keep the fuel pressure constant relative to the intake manifold pressure. So if more flow is provided by a higher capacity pump, then th FPR will compensate. There is of course, a range of operation, which is the reason you might see a higher pressure at idle as it may not be able to open the orifice any more to decrease fuel pressure. But as you open the throttle and more fuel starts flowing, the FPR will not need to bypass as much fuel and will be within it's range again, reverting back to the set relative pressure. And since the relative pressure at hiher flows will be the same as the factory fuel pump, the injectors will not be able to flow any more fuel. If anythin for a low boost set-up to be run on stock injectors, run a decently matche Rising rate regulator and call it a day. As many negative remarks I see people give about RRFPR's, they work(to a certain amount of boost) and are simple and cheap. I ran one for a year with absolutely no problem.

[PapaSmurf2k3]

sex ed. lesson update:sticking wastegate open= abstinence

I agree though, stock injectors with no fuel management is just not smart

[sunnys14]

You DON'T need an SAFC.

You DON'T need an FMU.

You're only running 5-8 psi, you'll be fine.

if u dont run SAFC or FMU, how are your injectors going to give extra fuel to compensate for the extra air coming in?

[K240]

In my Opinion, dont take the risk until you know that your fuel system can handle the boost for sure... just make the wastegate stay open, until you can upgrade.

[nissanparts.org]

greg you need to get larger injectors and atleast something to tune it to get that setup flowing nicely according to the calcuations some of the members here have show.

i will even try and get you nice price on stock sr ones.

[thekawaii]

Thanks guys for the great info and THE answer

I actually did all the researches myself, so I did picked up some of the wrong informations from internet.

I am going to tune it with 450cc as soon as possible.

[Import_Ant]

if u dont run SAFC or FMU, how are your injectors going to give extra fuel to compensate for the extra air coming in?

as he stated the ECU is able to compensate to a degree. your injectors are >NOT< running at 100% duty cycle stock. it is not as important how much boost you are running as it is important how much hp the motor is putting out. for example if you run 8psi on a T25 from an SR20 vs 8 psi from a T3 off of a Z31 which do you think is going to produce more Hp? The T3 because it can move a larger volume of air. while you could run the stock injectors on the T25 because you're still making less than 200 whp, you probably would be pushing it w/ the T3 as you approach the injectors' limitations. Look at hp not psi to determine your injectors' capacity. What I think Greg was trying to get out is that you can be safe to around 190hp on stock injectors if you feel like being risky. The figures C-Kwik posted support that claim. It's not a good idea to push the stock injectors to their limits but it gives an idea of what flexibility the motor has if you are planning on building the motor up in stages.

[Iamjohnhayes]

if you have the 440s and the safc why are you worrying about not having a fuel setup?

put in the injectors, set your safc and drive your car and if your still worried about anything buy the 225 fuel pump for 100 bucks and your basically set.

[thekawaii]

you didn't read the entire thread. anyway, this was solved million years ago. (it's 450cc, not 440.)