New twin scroll variable geometry turbocharger

[Drew99GT]

Cool design; if it takes hold, more car manufacturers I think would incorporate turbocharging into their cars because this design solves most problems associated with turbos. It has a twin scroll exhaust housing that divides the cylinders into 2 ports in the exhaust manifold/turbine housing. 1 scroll is smaller, the other bigger which in and of itself creates a sort of variable exhaust housing size for quick response and bigger top end power. Plus it has better exhaust scavenging. It also has a valve that closes at low rpms and makes the exhaust housing smaller which speeds up the exhaust and spools the turbo quicker; the valve opens at higher rpms/backpressure for good top end power.

 

[OneEyeJack]

if it's complicated and adds to the confusion under the hood with extra plumbing and makes routine maintenance more difficult does that mean that we can expect it to appear in an Audi in the near future?

 

[simple_gifts]

Very interesting; thanks for that. Can i get a handle on that lever in the cabin?

 

[wemay]

Its funny you shared this. I was reading below info coinsidentally.
Thanks for posting.


TurboNews 1/2014 (pdf, 2765 kb) - BorgWarner Turbo Systems
www.turbos.bwauto.com › download

Quote:
...Long-standing partnership
The 1.6 GDI turbocharged engine is
not the first development project in
which Hyundai Kia has collaborated
with BorgWarner Turbo Systems. In
fact, the turbocharger specialist is
already supplying for example turbo-
chargers with variable turbine geo-
metry for the Hyundai ix35 and Kia
Sportage models, as well as regu-
lated two-stage turbocharging sys-
tems (R2S®) for the 360 cubic inch
(5.9 liter) inline six-cylinder diesel
engine, which is used in several of
Hyundai‘s commercial vehicles.

 

[DoubleWasp]

Originally Posted By: OneEyeJack
if it's complicated and adds to the confusion under the hood with extra plumbing and makes routine maintenance more difficult does that mean that we can expect it to appear in an Audi in the near future?


Only new tech here is two old techs being put together. VGT turbos have been in use for decades in mechanical form, and years in electronic form. Twin scroll housings have also been in use for ages.

The ground-breaker here is both designs being used together. Twin scroll goes a long way to spooling faster, preventing exhaust gas reversion, and increasing scavenging. Earlier spooling can be expected from a twin-scroll design alone, as well as more torque. Putting it together with VGT is an incredible match.

 

[Cujet]

In the "tuner" world, this is called a "quick spool valve". If designed correctly, they work well. There are a number of variants, some better than others. But they all do the same thing. That is, shut off one passageway of a twin scroll turbo. The catch is that all the exhaust must merge in the collector before the scroll, not separated like many twin scroll installations.

 

[ls1mike]

What my 2.0 Malibu Turbo has

Twin-Scroll Turbocharger: an advanced, electronically controlled turbocharger with a unique twin-scroll design is used to increase power in the LTG Ecotec 2.0L turbo. Each of two scrolls on the turbine is fed by a separate exhaust passage – one from cylinders one and four, the other from cylinders two and three – virtually eliminating turbo lag at low engine speeds, giving the engine immediate throttle response associated with a naturally aspirated high-performance engine. The turbocharger generates maximum boost of about 20 psi. Because direct injection cools the intake process compared to port injection, it allows the LTG Ecotec 2.0L turbo to safely operate at higher boost and a relatively higher compression (9.2:1) than a conventional turbo engine, increasing both output and efficiency.

Read more: http://gmauthority.com/blog/gm/gm-engines/ltg/#ixzz3uXsOzM6x

 

[ls1mike]

I once had a Mopar with a VNT or Variable Nozzle Turbo.

 

[TiredTrucker]

Seems like basically an improvement on a waste gate type of turbo, but computer controlled vs boost pressure moderated.

 

[DoubleWasp]

Originally Posted By: ls1mike
I once had a Mopar with a VNT or Variable Nozzle Turbo.


My Uncle had a Shelby CSX-VNT with the plastic wheels. What a beast for the era.

 

[ls1mike]

Originally Posted By: DoubleWasp
Originally Posted By: ls1mike
I once had a Mopar with a VNT or Variable Nozzle Turbo.


My Uncle had a Shelby CSX-VNT with the plastic wheels. What a beast for the era.

Ah the Shelby Fiberide wheels. Can't find them anymore. Gold worn on the 89 Shelby. Car was red.

My VNT was installed by me on an 88 Daytona. The original Mitsubishi turbo died so I did some upgrades. That car always ran good.