I have a 2005 Z71 with the 5.3L, and I was wondering if I could make an internally waste gated diesel turbo work? It is a Holset HX40. Would it be worth the money to build a kit and make this turbo work if I can get the turbo itself for free?

 

The HX40 is not bad, but the gate is set pretty high for most gas applications. Only problem with the HX40's we have run across is the shaft is a bit weak, so make sure you have plenty of BOV on the setup. If not it will shear...

 

Is their any way to change the gate size to a lower setting?

 

I'm pretty sure it uses a spring in the waste gate actuator. You might be able to put a lower pressure spring. But it being a diesel application, you always wanted more boost. It would probably be hard to get a spring rated for the pressure you want that would fit the actuator. And actually those actuators are crimped or welded together. Not nearly as easy to swap a spring as a gasser wastegate. The easiest thing to do would be to install a external wastegate upstream of the turbo and just forget about the one in the turbo.
That would still be alot cheaper than a new turbo.

Od

 

Just start cutting down the spring till the gate opens when you want.

 

I looked again at my turbo, and I realized it is an HX40W, not a HX40. Don't really know what the difference is but maybe someone will chime in. Does anyone know what the wastegate is set at on a factory HX40W? Anymore opinions on this set up?

 

The W stands for wastegated housing.

 

Anyone got any ideas of where to by a oil pump to use with this turbo?

 

Anyone know what size exhaust flange bolts up to this turbo, the Holset HX40W?

 

Thinking about doing the same thing. I got a brand new, internally wastegated IHI turbo from a Duramax for free from a buddy. The only thing I'm worried about is that it may not flow enough air for a gasser application. (6.6L at 3250 rpm max vs. 5.3 or 6.0L at 6500 rpm....)

Thoughts?