Zak

Quick question,
I just put a powerdyne supercharger running about 7-8lbs of boost on my 2005 v6. I also added 24lb Ford Racing injectors. However, it just can't seem to get enough gas. When I step down, it lugs hard. But when I bring it up slowly, the power is all there.

Do I need a more robust fuel pump? Or is there some kind of adjustment I can do? Anyone know what my next step is?

Thanks,
Zak

GrayPony

Most 4.0 supercharges require 39lb injectors. What kind of tune are you running? Did you dyno the car after the install?
Does Powerdyne make a kit for the 4.0? I know they make one for the GT

Zak

Hmmm buying the wrong injectors could certainly be the problem! I have tried a wide range of custom tunes using a diablo sport programmer. Have not dynoed the car. Powerdyne doesn't make a kit for the 4.0, it's a home-made rig.

schapman

I have the x-charger and that kit came with 39lbs injectors.

basketballord

Aren't the stock ones like 19 lb/hr? Didn't the powerdyne system come with correctly sized injectors, or did u just buy some yourself?

Zak

Well, like I said, it wasn't a kit. I just bought a powerdyne supercharger and made it work. I bought some injectors that were bigger, but not a lot bigger than stock. Looks like I made the wrong call, should have done more research. I just ordered some Ford Racing 39lb injectors.

Mr. Ugly

You'll still need a custom tune.

You can't just stick the injectors in.

tx_zstang

You need 39 injectors. You are starving your engine for fuel. And without a proper tune, you are begging to destroy the engine!
Get some proper injectors and a proper tune before running it hard, please!

The fuel pump easily handles up to your moderate boost levels. I didn't start running into pump issues until doing over 10 psi, and then doing a wiring upgrade supported my 12+ psi with no problems. But, with 39# injectors and a proper tune.

GrayPony

You need to STOP driving the car, replace the injectors and get the car to a professional tuner for a tune. (That's if you make it that long running it the way it is)

Torch_Vert

+1000

Homebrew setup, inadequate injectors, no tune = BOOM

Get this fixed NOW while you still have an engine.