4.6_fan

hey guys looking for some engine mods to boost power but keep on 87 octane. i have an 03 f150 4.6 4x4. don't need monumental improvements but another 60-70 horse wouldn't hurt. any suggestions. and sub 1500 bucks ideally if possible i know a nice lumpy cam and the explorer intake (gt40) made a huge difference pn my old pushrod 5.0 mustang. is there somthin similar i can do with the modular 4.6. thanks in advance for any tips and tricks.

Bryson

anything short of slapping on a supercharger won't ganna get you what you want. Especially with 1500 budget, idk if you could get a supercharger for that or not, I'd say just get a tune/exhaust/gear swap and it'll make a world of difference

Tackle

Efans
Programmer
Long tube headers

Might give you 50.

johnnycf26

X2 - For $1500 your options are pretty limited. But a set of long tubes and a tuner is a good start. Pacesetters will run you around $270 - $300, you could probably find a used tuner for $150 - $200. I would highly suggest gears. It wont improve your HP numbers, but it absolutely changes the drive quality.

corey5988

Maybe 50 to the flywheel. Save money and just tune it up good.

wjb21ndtown

Install a used 5.4 would do the trick if you do the work yourself (with mild upgrades still)...

Are there many write-ups on a 4v conversion? Or a complete mustang motor swap?

charliedyal

Under the engine/drivetrain forum geosase is doing a "98 F150 4.2 to Mark VIII" swap. He may have more info.

corey5988

Hate to be "that guy", but that's a horrible swap. It's a 4.6 and the DOHC B-series heads are known to have terrible low end. Not what I'd want in a heavy truck.

charliedyal

Your right. I guess you could mod it for more HP, but you loose the low end torque. These engines are rev happy and love the upper RPM spectrum. However they don't do well in a heavy truck. I'd rather have a stock 5.4.

Z7What

On the lightnings boards it's understood that long tubes don't really add/help with power until your over 500RWHP.

Honestly you won't gain 50, 60, 70 or 80 without slapping in a blower.

EFans don't make power but do help free up power from reducing the amount of rotating mass on the engine.

Tune will help

Intake and Exhaust is minimal also.

You MIGHT gain 20RWHP with all four mods to be completely honest.

That's just my 2 pennys.

Wayne