Holset H1C Turbo Questions - Need Help

[terrenceLP]

Building a custom Holset Turbo setup using a H1C Turbo on Stock Spec 7M-GTE.

My turbine housing is basically a hx35 with the 4 bolt mount and V-Band exhaust rear.

Smallest Turbine Housing I can find is 12cm - http://www.gillettdiesel.com/12cm2non-wastegatedturbinehousing-3.aspx

Any smaller is hard to find. These are also non-wastegated.

Question: Should I be concerned with the size of stock turbine housing?

What are the recommendations for the 3.0l 7M?

9 cm2 = 0.65 A/R
10 cm2 = 0.73 A/R
12 cm2 = 0.89 A/R - Holset Part Number - 3524123
14 cm2 = 0.97 A/R
16 cm2 = 1.13 A/R

This is the turbo -

 

[IRACEMYCOPCAR]

12cm2 should be fine, i was running an HX52 with a 16cm2 housing on a 1.5JZ (same 3.0l displacement) and it was great, i had full spool by 4000rpm so you should be between 3200-3500 with a 12cm2, i wish there was a 12cm2 housing for the HX52 i would have loved it even more.

 

[terrenceLP]

Thanks, now the hunt is on!

Any pointers on who has them in stock would help.

Getting Holset on the horn tomorrow.