B.A.Ram

I have very little education when it comes to turbos. My brother says he has a hookup to get a smaller turbine housing for my turbo which would make it spool quicker, however; wouldn't this cause lower boost numbers? Any info on this por favor guys...

rebal

smaller turbine will raise boost #s and will choke ...high egts in the upper rpm range sometimes a smaller one will help like going from nwg to wg turbine the smaller one spools faster bigger ones run cooler EGTs for the most part.

B.A.Ram

so it would not be beneficial?

Ocmechanx

Not for the most part, maybe just maybe in the situation that you were gonna leave ur truck the way it is, and tow next to nothing, it would spool faster, and thats about the only upside to it.

On the downside if you added any fuel, or towed anything egts would be horrible, not to mention drive pressures and overspeed.

Bryan

B.A.Ram

aight thanks for the info!

BigBlue

Do not get a smaller housing. I'd have to beat you if you did. The hx35 is a great turbo in factory form.

PourinDiesel

Big Blue is right.
I don't even think there is a smaller housing than the 12cm holset housing that you already have.
If you want LESS horsepower go for it!!

northslope

Quicker Spool = bigger sticks, but then again I'm "under-valved", grain of salt

B.A.Ram

haha, aight Blue. I was reading something on here about machining some part of the turbo? Obviously it is not a different turbine housing, do you guys know what it is?

G1625S

The wastegate on a stock 12cm housing only 'wastes' the rear 3 cylinders. If you take the housing off and clamp it in a drill press, you can drill through the divider plate in the housing. Now, when the wastegate opens, all six cylinders 'see' the pressure release. While the housing is off, you can also match the opening of the housing to the gasket and clean things up a bit. I just did this myself and am very pleased with the results. All this is really just a band-aid. Once you start to push a fair amount of fuel, the 12 becomes restrictive, period. But, for poor guys like me, a home-port job lets me use all of my fuel some of the time, and some of my fuel all of the time

northslope

Drill or you could do this also:

I noticed the benefits right away removing part of the divider let it breathe better as well. Spooled a little quicker definately got control of my boost lessened the black cloud also

B.A.Ram

Ok I'm still a little confused as to what you last two are showing/talking about. Any more detailed info? Once again, turbo illiterate is on the net. I just need enough details to tell my bro (he works for Caterpillar).

northslope

What you're looking at is a turbine housing that has 2" of the partition (center divider) removed. The reason why is that it is rumored that removal of said partition may increase the a/r (flow) of the turbine housing (making it like a 13 cm housing). If you look inside the left side of the housing you'll see a hole, that's the wastegate hole. The wastegate only vents the back three cylinders in the divided turbine housing. What drilling the divider as stated above or partial removal of the divider does also is allow the wastegate to vent all six cylinders. In a stock turbine housing configuration when you run large injectors it becomes very easy to over-speed the turbo simply because the front three that are not wastegated keep driving the turbo thus creating more boost while the back three cylinders are wastegating, do you see the imbalance in that equation? Therefore drilling the partition or partial removal of the partition gives control back to you when all six cylinders are vented. Now with all six wastegated with a boost controller I can tune the boost back down to 35psi, even down to stock if I so desire, that's what we're showing/talking about, does that help any?

B.A.Ram

thanks northslope, I will relay the info. to my bro!