What size should I go? I'm looking for low 12s mid 11s ,I was thinking 70 mm running 5-8 psi none intercooled for now thoughts? its my dd so would like the boost to come on pretty quick, but also not fall flat in the higher rpms. Truck in sig has 3.42s , Thanks.

 

Doubt you'll see those times on a non intercooled setup at 5-8psi. a 70mm would spool FAST on an lq9, but would choke out up top. A 76mm would be better. Or somewhere between 76-88mm

 

I'm shifting at 6k would a 70mm still choke up shifting then?

 

+ on 76mm

Why are your shifting points so low? I would think to do like 6500 or so..

 

a 70 seems a little small no matter what on a 6.0, but take that with a grain of salt as I'm no expert. Hopefully kb or trick will chime in here

 

thats where it dies off, plus playing it safe for right now till I build it. I have a tbss intake and tb for later on, then it will probly be shifting around 6500.

 

stock48 is in the 9's and runs the stock intake and TB....

 

A 70's a bit small on a 6l, but if your only running 6-7psi and shifting about 6k then it will work. I've ran low 12's at 110 with my truck (5400lbs 4x4 at 8k DA) with a t70 .68 a/r and 15 psi intercooled on my 5.7 ls1 and just a small cam. Also shifting it about 6k.

 

the 70mm sounds like a good dd turbo, quick boost not alot of lagg .