DickH

I am curious about the 03 cobra fuel system. How far will it go, when does it need to be upgraded?

Timspony

...about 500rwhp before your need to upgrade on the injectors and add a BAP

mfj

If you upgrade the injectors and add a boostapump, you'll be good for up to about 700rwhp... After that, I would just do a REAL return style fuel system.

DickH

Awesome, thanks. Forgive my inability to google things, but about how far can you go with the supplied blower?

Mustang3GT07

About 500rwhp with a port n polish of stock blower, pullies, intake & exhaust.

xxkazp3rxx

Actually the stock eaton, when ported can get in the middle 500range (stage 5 port)...

Also, the fuel system which needs at least the BAP to normally get at or above 500rwhp.. you will also need to upgrade your MAF for air... injectors aren't needed until around 600 (depends however on car/location)

DickH

ok ok awesome, I don't think there would be a need for much more, what all is involved in a stage 5 port?

xxkazp3rxx

removing your blower and sending it to Steigmeier (I can never accurately spell that guys name!) -- http://www.stiegemeier.com/home.html

DickH

How much boost is needed on the eaton to obtain 500hp range?

xxkazp3rxx

It's not about Boost... Boost is different on everything; but you typically need: Intake, exhaust, upper pulley (2.76, or 2.81 w/idlers) and a ported blower. Along with that to support the power: MAF and KB BAP.

You should also have cooling modifications on your car to support to heat: Head cooling mod, tstat, radiator, Heat Exchanger, and people also put on the expansion tank.