Vgt compound

slc dzl · May 21, 2012

The duramax has compound kits that use the stock vgt.
My question is why cant the stock 6.0 turbo be compound?

If its backpressure can you wastegate around it and tune the vgt solenoid to
work with the gate?

Or is it the turbo shaft or thrust bearing? Not something im looking to do just have always wondered about it.

Pizza pig · May 21, 2012

its the way the vgt is controlled, Duramax's use a vane position sensor to set vane position, 6 liters do not. The use back pressure guestimates and equations to set vane position. This is why you cant really successfully gate around with without doing some intense tuning.

It has nothing to do with the shafts or anything, the stock duramax turbo share same frame as the 6L.

I'd like to see someone pull it off, it is possible.

BlueWaffle · May 21, 2012

TooMuch03 · May 21, 2012

I'd like to see it done, but the tuning would be nightmare

faster6.0 · May 21, 2012

Anything is possible

slc dzl · May 21, 2012

I like where this is going.
Anyone know what would pair nicely with a 68mm powermax?

Pizza pig · May 21, 2012

TooMuch03 said:
I'd like to see it done, but the tuning would be nightmare

Not quite a nightmare, just using your brain and a little ingenuity. Hurry up Lance, I know a guy who can help LOL

faster6.0 · May 21, 2012

Lance u gotta keep that thing in one piece with 1 VGT first

Extended Power · May 22, 2012

slc dzl said:
I like where this is going.
Anyone know what would pair nicely with a 68mm powermax?

A good rule of thumb is that your primary should flow twice as much as your secondary.

BlueWaffle · May 22, 2012

Dozers Diesel said:
Lance u gotta keep that thing in one piece with 1 VGT first

If I could keep up and y pipes together it would be just fine!

Cutting-Edge Diesel · May 22, 2012

stroke of luck said:
Matt...I see you reading this. How am I doing LOL?

2wd-fire · May 22, 2012

pizza pig said:
its the way the vgt is controlled, Duramax's use a vane position sensor to set vane position, 6 liters do not. The use back pressure guestimates and equations to set vane position. This is why you cant really successfully gate around with without doing some intense tuning.

It has nothing to do with the shafts or anything, the stock duramax turbo share same frame as the 6L.

I'd like to see someone pull it off, it is possible.

What about on the early stratiges that use the ebp sensor

Redneck6.0L · May 22, 2012

the biggest low pressure you'd want togo with is a s471, stock or powermax with a 50mm external gate with no bigger than a s471 runs good, but do not go bigger than a 71 for it will puck up your high pressure

jbkingranch · May 22, 2012

Hmm... I've got a couple of 60mm turbos at my disposal off Series 60 Detroit's. Don't know what the flow rate is but as a single it makes 400hp and 1200 on the torque for a 11+ liter engine. I told a buddy of mine a week ago it might be worth a try.

strokin6L · May 22, 2012

Redneck6.0L said:
the biggest low pressure you'd want togo with is a s471, stock or powermax with a 50mm external gate with no bigger than a s471 runs good, but do not go bigger than a 71 for it will puck up your high pressure

Shawn i thought i remember hearing that you actually tried running the stock vgt in a compound setup a long long time ago when you were first trying twins out. What size low pressure did you use and did you gate it?

IdahoF350 · May 30, 2012

I've been thinking about this for a long time. I have a slightly different approach in mind. I wanted to run a pair of smaller turbos as the low pressure units, about the size of GT3071Rs, one on each exhaust manifold, with a waste gate to and controller to light them off and hold them at something like 20psi. Pipe the outlets and waste gate circuits back together and run them to the stock turbo. Move the EBP sensor to the new Y-pipe from the new low pressure units and the stock turbo. The small turbos should spool just fine, and in turn make good low speed airflow. The factory tuning could then be altered to control the peak boost based on throttle just like it does now. I would think something like this could make 50-60psi.

windrunner408 · May 30, 2012

Good luck with that.

HOOV3R · May 30, 2012

Why run off of each manifold? Would just make more of a piping disaster.
Also, why put your low pressures before your high in the exhaust?

IdahoF350 · May 30, 2012

Those are the responses I expected, along with:

It can't be done.
Why would you try to do it that way?
Insert random bash here...

It's cool, I'll lay of the crack pipe for a while....