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Originally posted by techboy
So, if I am understanding this corretly, the problem with running just a Walbro in-tank is not that it doesn't work, but that fine tuning at idle becomes difficult b/c you are using larger injectors?
The pump has nothing to do with fine tuning idle. You can run a Walboro intank pump by itself, just fine, using LARGER than stock injectors, or even stock injectors, running lower boost. The reason why you dont want to run a walboro with stock injectors past 7/8 psi, is because you need very, very high fuel pressures through the stock injectors, to supply enough fuel. The fuel flow output of the walboro drastically drops off past around 80-90 psi pressure. The walboro is capable of delivering almost 12 gallons of fuel per minute, at around 45-50 psi, and that is a shit load of fuel..as fuel pressure increases, fuel flow decreases, but its not as important, when running larger fuel injectors, since you have greater flow out of the injector, and you run very low fuel pressure at idle and under boost, compared to stock injectors. I ran around 12 psi on 315's, and fuel pressure was over 100 psi, so a walboro by itself in this case, would prob not be adequite. If you use something like 400's or 440's, then a walboro by itself will be just fine, assuming you dont run over 90 psi of fuel pressure or so..
I use the 8 injector setup, and i love it. After using this setup, compared to a rising rate fuel pressure regulator setup, its sooo much better, and fine tunable. Now, this doesnt mean a rising rate FPR doenst work, or work well, but it has it LIMITS, esp when running large injectors. And you can't really fine tune that setup very well, or effectivly to tune for max power, ect..The nice thing about the 8 injector setup, is you can add/subtract fuel at a certain RPM, at a certain boost pressure, if the need arrises, and it usually will, as our motors have a notorious lean spot in the power band. Its up to you what you want to do fuel setup wise, both ways work, and both are affordable, but much better tuning accuracy with an 8 injector setup, and you can run just a walboro fuel pump(until you max out 12 gallons of fuel per minute). Hopefully this helps you some.. Oh, and I have run the stock intank fuel pump, with the Accel inline pump for over 2 years now, and have NEVER had any problems, even with fuel pressures over 125 psi..
13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
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-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)
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I forgot to mention it, but we are gonna have an afpr too. I think we'll try it first without the safc. I would like to get "turbo grind" cams after a while as well, then maybe go with the safc at that time. 
