I've made a couple post about my project and each time I get closer and closer to the part list and budget all figured out. The short version of the story is I built a 2004 STi that makes 400 to the wheels, it was super annoying the whole time so I want to make the change to the muscle world. I'm selling my STi build to fund a high hp 240sx ls1 swap drag car. I want the look of a "tuner" car because that's what I like best, but have a reliable ls1 to whip ricer *** lol. My build list so far, Donor ls1, 408 Texas speed lq9 shortblock, Brian Tooley turbo stage 2 cam (226/231 .605/.598 113+4), Texas speed PRC stage 1 lq9 ported heads with .625 dual springs, ls2 timing chain, m10296 oil pump, ls6 intake, t 56 6 speed with Tick Performance level 2 package, Aeromotive dual phantom system, aeromotive a1000 injected bypass regulator, 12 gallon fuel cell, Holley Ls hi flow fuel rails, CXracing single turbo ls1 240 swap turbo kit(not using their turbo), pt88, Hallman boost controller, cxracing intercooler, 2 tial 44mm wastegates, 50mm turbosmart bov, and all the bits i need for the actual swap like mounts and wiring harness. My #1 question is on fueling. I want a simple drop in fuel system that's gonna work plenty for the power I want so that's why I chose the dual phantom setup. But what injectors? I'm confused because I read these forums and it seems you need to modify to accommodate the bigger injectors like the 120s, so what's the deal with getting the big 120-160 injectors to work in my ls1? I wanna be in the 1000hp range eventually so I want this setup to be capable of that, im gonna start myself low boost to get used to big power then I'll be turning it up. Also would you guys recommend getting a Holley efi ecu? They're little pricey but from the YouTube videos I've watched it seems like a really nice system to have. So what injectors do I need and or what modifications I need to run them and should my setup be controlled by a Holley efi? Oh and one last question, Texas speeds smallest spring option was .625 for the lq9 heads, will that be alright with my cam that's max lift is .605? Thanks guys you help out a bunch.

 

With the build you’ve listed you won’t need 120’s or 160’s. 60’s will be fine. 80’s will be fine to 1000 hp.

Bigger injectors are harder to idle on stoich or lean. Unless you get ID which are $$$.

I can tell you’ve put some thought into your build, but I think you’ll be underwhelmed honestly. I think in particular the cam is too small. That’s a mild cam for a 346. In a 408, it’s a baby cam. I’d add ten degrees to both intake and exhaust durations personally

 

I agree with Darth on your cam being to small for 408".

 

What fuel? 93? E85?

 

93 pump