Fuel Pressure, Boost, Injector Flow

[5.3LS10]

So I have a couple questions. Looking to do a budget friendly fuel system for an efi conversion I am doing. Was considering a Walboro 255 inline pump and a Wix 2002 corvette regulator/filter setup. So first disadvantage I see is that It will only run at 58psi. So as boost increases (~15psi) they injectors will be flowing at ~43psi (since there is manifold pressure pushing against the fuel through the injector?) which will decrease the volume correct? Will the only disadvantage be that I have to increase the VE table above 100kpa more than I normally would have to if I was running a 1:1regulator? Also will have to consider the injector flow rate at base fuel pressure MINUS boost pressure? So make sure the injector flows enough at 43psi to support my hp goal of lets say 550-600? Just wondering if its worth the extra $300-400 for the correct regulator and pump or if I can just correct for this in the VE table?

This is my first setup like this so wanna make sure I get it right before I order parts.

Thanks
Shane

[slow_hemi6]

With the boosted application you really are going to need to have referenced pressure regulation.

[5.3LS10]

With the boosted application you really are going to need to have referenced pressure regulation.

For the reason above?

[Dasman56]

Does the fuel pressure correction in ms3 correct for this ? When you have your regulator type set to fixed

[slow_hemi6]

With the boosted application you really are going to need to have referenced pressure regulation.

For the reason above?

Yes having it idle around 70psi effective and 43psi under boost is going to give all sorts of headaches with trying to maintain AFR. There is enough pulsing in the rail already before throwing that pressure variation into the mix. Keeping the injector delivery as linear as possible is a very big deal when trying to maintain repeatable and reliable AFR.

[5.3LS10]

With the boosted application you really are going to need to have referenced pressure regulation.

For the reason above?

Yes having it idle around 70psi effective and 43psi under boost is going to give all sorts of headaches with trying to maintain AFR. There is enough pulsing in the rail already before throwing that pressure variation into the mix. Keeping the injector delivery as linear as possible is a very big deal when trying to maintain repeatable and reliable AFR.

So is there any reason why I could not just use a boost ref regulator and still use the aeromotive pump just set idle pressure to 43.5 not 58. I believe the siemens injectors I was looking at were advertised at 43.5 psi anyways. Wasn't sure if there was an issue or downfall running the injectors at 43.5 psi out of boost.

[slow_hemi6]

It is just a referenced regulator. When the manifold is under vacuum it reduces rail pressure to give a constant pressure differential across the injector and then it maintains that differential through into boost by increasing rail pressure. So if you set the reg pressure to 43psi with the reference hose unplugged and then you reconnect the reference, expect a pressure gauge on the rail to show 43psi - manifold depression at idle, and 43 + boost psi when in boost. Rail pressure changes but the pressure across the injector doesn't.