Fuel system/headers for 400whp?
 

Do I need to upgrade my fuel system more if I want 400rwhp? Right now it runs on 39lb injectors, stock rails/lines/tank, and an in-tank Walbro 255 FI pump. I know people say the pump wont work but that is not an issue. Its been there for going on 2 years and the car had the tune adjusted for it. I am just wondering if that pump will flow enough fuel for at least 400-410rwhp? I am pretty sure that the injectors will be fine.

It made 340whp before I found a small boost leak. I am adding an intercooler, 10# pulley, 90mm MAF adapter, and an AFM Powerpipe in less than 2 weeks and hoping that I will see 400rwhp but I dont want to get caught on the dyno with not enough fuel.

Right now its on 8lb pulley non-intercooled and running with the standard 80mm MAF adapter when I have the 90mm MAF so there is a little bottleneck there.

Do I need headers on the car to safely make 400whp? I am on the stockers and planning on keeping them for awhile....

maybe a boost-a-pump will help. i run a 20 amp kenne bell BAP on my focus pump. i ran out of fuel at 5500 rpms and 408 hp but my car is a auto. im sure the focus pump flows the same as that walboro peice. so your pump alone should get you to 400 easily. add a BAP for extra insurance.

it really depends on the car, my buddys 03 gt auto with a procharger and 12#'s of boost only made 380 and 390 something torque on tims tune. daves tune from kauffmans it only made 370 something. his car just didnt want to make power. my car with 11-12#'s made over 400 on 3 different pulls at 5500 rpms while running out of fuel. had to add a BAP and pulled some timing thats what i think MPH did. my numbers were made with only a cat back, plenum and 75mm TB.

ima guess you will make something between 380-400. 60 HP for a intercooler, powerpipe and 2 extra PSI is a stretch. if your car makes more :Woot:

I am running a 255lph walbro at 385whp/435wtq so i wouldnt think it would be too much of a stretch to get 400whp with the fuel pump (i plan on doing that soon)

I cant help ya with injectors, i only know that you would need 42#'rs if you were a v6, but thats totally diffrent