i have a fully build gsr. i can not choose turbo between t3 60-1 w/.63a/r turbine or t4s 60-1 with .70 a/r turbine . i will boost 14psi for daily driven and 28psi at track.

 

yes, i use a T4 60-1 garrett ball bearing for my daily driver. If you car is really built, 14psi might be overkill. 10psi daily for me=326hp and 221ft lbs of torque and that's enough to take almost anything on. Just make sure you get a ball bearing, it makes it alot more fun for the street cause you spool faster.

 

When is too much boost overkill?

I run 14 psi(1bar) daily and it's great. I would recomend the biggest turbo you can afford. Especially since you have a b18, If you had a b16, then you would have an issue with creating enough exhaust gasses to spool the turbo efficiently. The t4 60-1 will do great. Plus: the bigger the turbo=the more cfm's you will create=more power per pound of boost.

 

you know what i mean, there's a point where you gonna make to much power for drag radials let alone street tires.