Originally Posted by alaskanzx5
so im guessing you have been able to get your hands on a 2013 st huh?
from this stand point right now what do you thin will have to be done to fix that nose dive its taking? better breathing? different turbo? a tune that will give up a little tq but create a better power band across the board?
Turbo is the big issue , the turbo is undersized and this isnt a bad thing , my guess is because it would make the RS look bad to come out with HP the same as the ST
Change the turbo then a tune , then work on the Exh and piping to and from the turbo
My opinion is for those that want the big power buy an older duratec 2 door and do a built engine and add turbo get to 300-350 and have fun
The ST is a very costly car to be adding and changing things for big power
By adding a bigger turbo you will loose the 2500 rpm quick spooling and 4500 nose dive and switching that to 3000-3400 spool and holding to 6000-7000
Most everything with turbos is a trade off