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General Motors has filed a patent application for a new two-stage turbo system.

The filing, published by the USPTO on May 19, 2016, details a two-stage turbocharger where the low pressure turbine and the high pressure turbine are arranged in a series. The brilliance of the new proposal is a bypass system that allows GM to optimize both the high-pressure and the low-pressure inlets for their respective tasks.

According to the filing, typical two-stage turbochargers are configured to operate both turbines simultaneously at low/mid engine speeds, while at high engine speeds, only the low-pressure turbine operates. The issue with this design is it can never completely isolate either the low or high pressure side, forcing inlet design compromises, which in turn can impair low end performance and result in higher pumping loses. GM’s new system proposes to eliminate the compromise.

The high-pressure turbo is linked to the exhaust manifold through the high-pressure inlet duct; the low pressure turbo is connected to the high pressure turbo through a low pressure inlet duct, which links to a connecting channel.-

Bypass is created through a single actuator that lives in the exhaust manifold, it either opens the high-pressure inlet and closes the connecting channel or vice versa.

The system is actually pretty brilliant in its simplicity. The actuator takes direction from the ECU based on engine speed and load, the actuator is a single rotating spindle with discs corresponding to flanges on the high and low pressure sides. The spindle rotates 90 degrees isolating the respective sides of the two-stage turbos.

Isolation allows the respective inlets to be designed for the best possible fluid dynamic performance. This way the maximum available enthalpy is given to the low pressure side in full power operation, likewise to the high pressure side in maximum torque operation.

Want to bet we see it in a Cadillac first?
Read more about GM Patents New Two-Stage Turbo at AutoGuide.com.
 

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2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
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Excellent.

My friend was building a similar (obviously custom) setup for his Caravan. Little turbo feeding into a big turbo with all sorts of bypasses and everything.




It's a shame he sold the vehicle - coulda been insane. The van already ran a 13.5 on a slipping clutch with just a lightly built stock turbo, can only image what this would've done.
 

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Good breaking story. Another tip of the hat to AG.

Look for this new turbo setup as an exclusive on the coming Cadillac V8.
 

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Similar to the way the new bmw turbos are running it looks like?
 

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2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
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Similar to the way the new bmw turbos are running it looks like?
Pretty sure the BMW turbos are just all single twin-scrolls. A twin-scroll kind of uses an integrated form of the concept.
 

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Administrator, Resident Tater Salad
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Screw Cadillacs. Put this in a regular engine.

And then don't cast the actuator thing into the exhaust manifold/head where the entire thing will have to be replaced when it goes wrong.
 

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Start in the Cadillacs and get the bugs worked out before bringing it to Chevy. Other than the Volt, Cadillac has been GM's technology integration test division.
 

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The mechanical drawing/diagram shown is a common rail 4-cylinder common rail diesel engine complete with glow plugs. We could be looking at the next generation Cruze Diesel engine or the next gen 2.8L Duramax for the Colorado and Canyon. I would guess that this new compound turbo setup is for a diesel engine to help gain some more power, performance and improve mileage to help offset emissions system restrictions/losses. Look at BMW, they just announced a QUAD turbo setup for their 3.0L diesel engine!
 
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Conservative Acoustic Foam
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Screw Cadillacs. Put this in a regular engine.

And then don't cast the actuator thing into the exhaust manifold/head where the entire thing will have to be replaced when it goes wrong.
Maybe the simplicity of it will save it from being the disaster that every other complicated "dual-stage" boosting system has been.

When things starting going wonky in my Supra....goodbye sequential twins, hello large single.
 

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Maybe the simplicity of it will save it from being the disaster that every other complicated "dual-stage" boosting system has been.

When things starting going wonky in my Supra....goodbye sequential twins, hello large single.
Lets hope other manufacturers don't decide to put turbos INSIDE the V of the engine block next (ahem, BMW).
 

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Would be cool to see it on a ATS. Even the Cts-v would be cool if going big.
CT6
CTS-V
and the higher XT6+ and CT6+ variants.
 

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The mechanical drawing/diagram shown is a common rail 4-cylinder common rail diesel engine complete with glow plugs. We could be looking at the next generation Cruze Diesel engine or the next gen 2.8L Duramax for the Colorado and Canyon. I would guess that this new compound turbo setup is for a diesel engine to help gain some more power, performance and improve mileage to help offset emissions system restrictions/losses. Look at BMW, they just announced a QUAD turbo setup for their 3.0L diesel engine!
It has been said a number of times that Powertrain is working on a diesel for Cadillac.
 

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When things starting going wonky in my Supra....goodbye sequential twins, hello large single.
MK3 7m-gte never had that issue lol.

im all for some extra engine response and more efficient power but im not willing to sacrifice a lot of simplicity for it. for the added complexity the gains would need to be absolutely bonkers in my book.
 

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MK3 7m-gte never had that issue lol.

im all for some extra engine response and more efficient power but im not willing to sacrifice a lot of simplicity for it. for the added complexity the gains would need to be absolutely bonkers in my book.
They just blew head gaskets :)
 

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Conservative Acoustic Foam
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MK3 7m-gte never had that issue lol.

im all for some extra engine response and more efficient power but im not willing to sacrifice a lot of simplicity for it. for the added complexity the gains would need to be absolutely bonkers in my book.
I had 2JZ-GTE. And most MKIV folks quickly ripped out all the excess plumbing eventually.
 

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They just blew head gaskets :smile:
nothing a torque wrench wont fix lol

im a fan of all supra but the mk3 is my favorite. like single turbo i 6 not twins. plus the front end is amazing on a MK3
 

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Conservative Acoustic Foam
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nothing a torque wrench wont fix lol

im a fan of all supra but the mk3 is my favorite. like single turbo i 6 not twins. plus the front end is amazing on a MK3
I did tell myself one day I'd get a MKIII. I do like the look of them.
 

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I sold mine due to tough times and i will buy another. is it the fastest in the world no but its a fantastic grand touring sports car. does everything better then the vett of its day
 
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