Seems to me around 88mm is close? I have a 408 W 4340 crank & h beams, 9to1cr with afr 225,super vic want to blow thru hat.Short block almost ready to go together and collecting parts.No cam yet but have solid rollers .Thanks for any advice.

 

88mm=lots of power. 1200 easy. a single 75mm would be a good starting place. 80mm for a little more agresive and 88 for max power. hope you have a good chassis

 

WOW i'm new to the turbo deal but 1200hp is more than i'm looking 4.If i could put down a real 700 at the wheel id be more than enough.

 

75mm will do that easy. garrett gt4208, BWs475, or junk yard a tv5101 for 200 dollars and have some fun

 

thanks,for your time,i'll up date soon.

 

what compressor (exhaust is best for the street)

 

i run a .96a/r t4 exhaust on my 355ci. (turbonetics 78mm) love it for street driving. you may want a 1.10 or so for the extra cubes... should have no problem spooling it.

75ish mm turbos are almost optimum for most people's needs for a street car. you can easily push the limits with one on public roads.

 

he has cubes and good flowing heads, small turbine or housing will be no good for him, that rules out the GT42 series altogether as the turbines are all too small, or did you mean 4508R?

S400 will be OK, S480 would be better, you will have no troubles spooling either, with solid roller and those 225's you really need to think big turbine, the GT42 series all have small turbines.

S400(475) at a minimum, the one with the 1.32 rear.

 

I have heard good things about the s480 I believe this to be a great fit for you as well.