09CobaltSS1

A lot really depends on how hard you plan on pushing the turbo. Past 25psi you're likely to need either the intake came with upgraded pump lobe, or 5th injector to avoid massive fuel rail pressure dips. Only logs from your tuner will really tell the big picture for your answer. I personally went the 5th injector route with my car. Granted most don't accept this is a viable long term solution, but I've had very good results with using it in the countless logs I ran on my engine. Some also claim that there's no way to accurately supply fueling to each individual cylinder. While this could possibly be true, until I see actual hard data to back this up I stand by my own results. Not to mention, try telling that to anyone making big power on a carb engine. The 5th injector is a similar principle as a carbed engine (central manifold fueling), just with more control than a carb.

rcd18

my plan is to run the 5th injector with the stock cams and like you said you wont really know untill its on the dyno with your tuner. but im just trying to get other opinions on using the stock cams with a 5th injector on e47 at 25-27 psi.

Boostin15

iTrader: (2)

someday i will get to those numbers...

r3v07ut10n

iTrader: (2)

^ lol this.. someday.

DCsnow1000

Congrats on the numbers. Very nice.

ctn2mb

iTrader: (2)

What's odd is I have a LDK with the larger fuel lobe on the ZFR and I'm still running out of fuel at anything over 25 psi lol

Sl0wbaltSS

It is NOT a sleeper. This is asleeper.

Wert842

iTrader: (3)

Just curious, do you know what happened on the last pull? What was with the dip in power?

Terminator2

Rail pressure dropped is my guess. That torque level suggests a huge boost spike and the hp is lower than the torque which means the torque is dropping off fast. That is more than 28 psi making 480 wrtq it would take closer to a 33-34 psi spike to make the ZFR make that much peak torque. The WG is likely just cranked to 100% the whole way.

Numbers are STD corrected. SAE corrected it would have made around the same whp as your car did SAE (around 445 whp and 465 wrtq) and yours did not need E-47 or a 34 psi boost spike at 4000 RPMs.