I want to install in my car who is street ported , a Garrett Gt40R . My goal is to make 410 whp at 14 psi with not race fuel.
The problem is that I dunno wich A/R choose.
I know that is a litle bit hard to recomend a A/R of a turbo , but I don't care if it have lag until 4000 rpm.

I have seen somes at www.atpturbo.com

 

might make 400 around 15 - 16psi using a .96 or 1.00 hotside.

 

Go with a 1.33, that'll should get you in the 400hp range

 

I have the option of buy 0.95 , 0.85 and 1.06 non dividev tangencial housing or 0.85 tangencial divided , but it is $280 more expencive , I dunno if there is a diference betwin the power that I can generate with a divided housing or a non divided.

 

here are some pictures and the map of the turbo

 

It is the map too in one of the pics , of the gt40R