stock fuel pump/injectors under boost?

[hyunpower]

anyone know how much boost can be applied to the beta 2 with stock fuel psi and injectors?
Im going to put a return line a fpr..run a safc2 and keep the stock xd fuel pump....sound safe at 3-5 psi?; putting bigger injectors later for 5-7 psi (440cc).a setup for under 200whp.
I heard the stock piston rings on the beta2 will blow out past 7 psi. is this true?

[2GTS]

3-5 should be fine stock with the safc. Going to 5-7psi you could go with the sonata injectors which are 290cc. If your goal is less than 200whp 440cc is too big.

[hyunpower]

the sonata injectors....like the ones on sharkracing.com

how much cheaper would it be if i got them from the dealership?

and also anyone know if 7 psi is the limit on the rings?

[2GTS]

Call your dealer for their price but $220 sounds pretty good.

[hyunpower]

use the 2.4L or th 2.7L of the sonata injectors?

[O_GT]

the 2.7 uses different ones plus they flow less.I know one of the guys on new tib used a walbro pump for a evo and has not had any problems.I also thing that 440s are overkill for 200whp 290s will be more than enough.The best thing you can do is get low comp pistons then you wont have to worry as much about fuel.

[2GTS]

The pistons will not reduce the need for more fuel, go with the injectors out of the 4cyl.

[O_GT]

the way I see it when you run run higher compression you need more fuel to keep from detonating.Now when when you have lower compression you will still need more fuel but not as much un less you plan on going with crazy boost

[Elantra2.001]

FOr that level, why bother?? The stock fuel system works upto 300 whp before it becomes obsolete. All you need is bigger injectors from what the Korean tuners say, and a SAFC.

[NCspecV81]

FOr that level, why bother?? The stock fuel system works upto 300 whp before it becomes obsolete. All you need is bigger injectors from what the Korean tuners say, and a SAFC.


bro...the problem with not running a return line...is that its alot easier to tune than a retunless system setup for n/a....he'll need to upgrade injectors..do a return line..and use a rising rate fuel pressure regulator to raise fuel pressure under boost conditions....thats the problem with the returnless system...it doesnt raise fuel pressure under boost conditions which will lead to over lean conditions under boost...especially at high rpms....

[Elantra2.001]

Nope, its been done. :thumbsup:
Not in the US, but in korea its been done.

[adeihl]

bro...the problem with not running a return line...is that its alot easier to tune than a retunless system setup for n/a....he'll need to upgrade injectors..do a return line..and use a rising rate fuel pressure regulator to raise fuel pressure under boost conditions....thats the problem with the returnless system...it doesnt raise fuel pressure under boost conditions which will lead to over lean conditions under boost...especially at high rpms....


Actually it is quite the opposite... you will run lean around 4k and run very rich above 5000.

Andrew

[Steve]

Isn't this where an AFC comes in? To override the ECU and add more fuel at 4000 and then take away fuel above 5000rpm.

[adeihl]

Isn't this where an AFC comes in? To override the ECU and add more fuel at 4000 and then take away fuel above 5000rpm.

Unfortunatly you cant add voltage to the MAP since it is already maxed out.

Yes you will need to take quite a bit of fuel away 4.5-5k on up.

Andrwe

[Steve]

Ah, don't forget the 2004's have a MAF sensor and a linear widerange front O2 sensor. How does that affect things?