Which one should I go with? Help me decide. :)
 

I'm in need of a new turbo and I'm sick of F-in around with these used pieces of shit. Decided to just get off my wallet and get a brand new turbo. I just don't know which one I want. I want neck snapping pull before 3500rpm but I also don't want my power dieing off up top. Which of the below would be the best of both worlds?

EDIT: Oh yeah, shooting for 330hp daily driven.

https://www.tamparacing.com/photopos...500/turbo5.jpg

i have the 50 trim .63 a/r in my z. doesn`t spin up as fast as i had hoped for it to, but when it does (3.5-4k) it`s a real kick in the ass. 20 something psi is cool.

i was thinking the .57 trim .48 but I don't know if it will get too flat up top.

57 trim with .48 a/r IMO would be best for you. I dont think the turbine housing size will make you go flat up top unless you plan on running alot of boost. which I dont think you will need to for 330hp. Most all KA's go flat up top no matter what turbo you have. Below is my dyno from last year at low boost on a 50 trim with .48 a/r @ 14 psi I didnt take it past 8000rpms on this chart. The torque curve didnt show any signs of a .48 a/r turbo. However on long highway trips the turbine would get red hot so the daily driving aspect of that wasnt real great but it sure did spool up quick and you can expect to spool up even quicker.



https://www.tamparacing.com/forums/a...s-tim-1.05.jpg

tyler i run the 50 trim .63...full boost ~3300ish.

if you're going to do 330-350 max, do a 50 trim with the .48a/r. alot of people run 57 trims on KA's, but i dunno why. the 57 trim will flow more up top, but the 50 trim is better suited to the powerband of a KA that isnt revving past 7k. even with a 57 trim you'd need cams and an intake manifold to really benefit from it. *goes to dig for freshalloy comparison thread*

yeah, i think the 50 trim w/ the .48a/r would be best for my app then. I have a built motor but the head is factory other than port and polish and I really don't want to get new valve springs and shit to support a turbo that should be operating in revs past 5500-6000. And I don't ever see myself shooting for much past the 330 hp mark, if I do I'd need to redo my entire fuel setup and the whole nine and I don't feel like going there. haha. Thanks a billion guys.

make sure you buy a real cheap one from china...


did you see the humor in that?

thats not funny garretts are made in mexico now