Fergavs

I need to know what the small turbines are for a the HC1 turbo. Obviously the most popular being the 12cm. What is available smaller. This is NOT for a cummins. It will be used on a different application that requires a very small turbine housing. If you own one smaller then this please PM me.

SkinnyBTN

You could look at some of the 2nd gen stock auto turbine housings. I believe they ran a 9cm on an hy35 turbo.

wannadiesel

12 is the smallest I know of.

G1625S

There was the HY-9 on the 24v automatics. Not sure if the 9cm housing bolts to an H1C, but the entire HY-9 can be had for about 200 bucks pretty frequently....

wannadiesel

The HY turbine housing is clamped on, it does not fit the H1/HX series turbos.

Fergavs

thanks guys

EatMySmoke

Is it possible to put a 12 cm housing in the stock H1C on a 92 Cummins? Thanks..

Dawson

G1625S

Yup, sure is, and it'll make you're truck a LOT more fun to drive. It'll make it real easy to surge the turbo, so you'll have to watch the loud pedal application down low in the revs. Everybody should try the 12--especially on a 5 speed

thewished

After owning a 91 5sp with a 18cm housing and now driving my 95 with a WH1C 12cm w/g housing I think about how much better my 91 would have been with a 12cm housing... If you can get a hold of a 12cm w/g housing do it!!!!! or even a 14 non w/g would be pretty good over the 18 or 21.

TruckU

That answers the question I've been considering. I'll be upgrading soon

Oldschooldodge

I went from a 21 cm to a 12 cm, and it's night and day difference.