Holden MY10 SIDI Technology: First Drive
By Jay Williams - 09/September/2009
SIDI V6 Calais V-Series Sportwagon
3.0-litre SIDI V6 Berlina sedan
3.0-litre SIDI V6 Engine
3.0-litre SIDI Omega Sportwagon
3.6L SIDI SV6 Ute
3.0-litre SIDI Engine
At a recent press day Holden showcased the latest evolution of their V6 range.
Spark Ignition Direct Injection or SIDI, Holden's latest technology
promises better fuel economy than any current V6 in its class and,
surprisingly, even some 4-cylinder engines.
This state-of-the-art technology features multi-point fuel injectors for direct injection into the combustion chamber.
conventional port-injected engines inject fuel upstream of the intake
valve into the intake port, this fuel and air mixture enters the
combustion chamber when the intake valve opens.
direct-injection V6 engines, the fuel is injected directly into the
combustion chamber during the intake stroke, at which time only air
flows through the intake system and into the combustion chamber when
the intake valve opens.
During the subsequent compression
stroke, the fuel and air mixture, now in the combustion chamber, are
ignited conventionally by the spark plug. As the fuel vaporises in the
cylinder, the air and fuel mixture is now cooler compared to previous conventional systems.
This enables the
use of a higher compression ratio in the combustion chamber, which
improves engine performance and efficiency. Less fuel is needed to
produce the same power, especially at normal cruising speeds, compared with
conventional port-injection combustion systems.
Holden claims fuel economy:
3.0-litre SIDI Omega Sportwagon (auto) - 9.3l/100km, 13% improvement over the
3.0-litre SIDI V6 Berlina sedan (auto) - 9.3l/100km, 12% improvement
over the previous model.
SIDI V6 Calais V-Series Sportwagon (auto) - 10.3l/100km, 9%
improvement over the previous model and fuel
3.6-litre SV6 Ute
(Manual) - 10.2l/100km, 11% improvement over the previous
Even though Holden has managed to reduce fuel consumption the engine range receives a significant boost in power.
3.0 litre SIDI V6 Omega and Berlina sedan
and Sportwagon increase from 175kW to 190kW
3.6L SIDI SV6,
Calais, Calais V-Series range increases from 195kW to 210kW.
Changes to the MY10 Commodore are mostly fuel efficiency,
improved driveability and a couple of new
‘hero’ colours 'Poison Ivy' and 'Wild Fire'.
The same body shape as previous models continues. The
interior in also unchanged, with mostly black plastics and dark upholstery.
most obvious change to Holdens V6 range is the new SIDI V6 engine
matched to a six-speed automatic transmission. Holden has also
introduced lower rolling resistance tyres from Bridgestone on models
with 16" and 17" wheels - Omega, Berlina and Calais sedan and
Sportwagon models and Statesmen, which also increase fuel efficiency by
Other features include:
Reduced idle speed - the SIDI V6 is tuned at 550rpm.
High efficiency alternator - smaller, lighter and more efficient.
Deceleration fuel cut - when decelerating or coasting downhill, fuel
supply to the engine is seamlessly cut and at certain speeds seamlessly
Turbine damper - the turbine damper smooths out subtle instabilities,
allowing the engine to operate in Low rpm, high torque range.
The two day launch began in Yuroke,
Victoria covering around 300km and concluded in Albury, New South
Wales. The task was to drive the Omega Sportwagon, Calais V-Series
Sportwagon, Berlina Sedan and SV6 Ute (all featuring the new SIDI
technology) and compare Holdens "claimed" fuel consumption in real
And I must say the numbers were impressive, even though it was country driving.
was divided into four legs, changing over cars at each checkpoint. Each
car was assigined a Holden representative to navigate, record fuel
consumption, distance traveled and average speed.
Fuel economy was the key aspect of the drive, the 3.6-litre engine in the Calais V-Series
Sportwagon recorded 10l/100km, 0.3l/100km less than Holden claims.
the standout of the day went to the 3.0-litre Omega Sportwagon which
recorded 8.6l/100km, 0.7l/100km less than Holden claims.
figures may sound impressive but some of the other journalists took the
challange more seriously and recorded even better results.
Which is impressive taking into consideration that the new engines have
an increased power output and, not only that, Holden has also managed to
reduce CO2 emissions.
Using the Federal Government's Green
Vehicle Guide, the Omega, Berlina sedan and Sportwagon and Calais sedan
models achieve a 5.5 Greenhouse Rating and four stars.
Official CO2 Emissions:
3.0-litre Omega and Berlina sedan and Sportwagon auto - 221g/km, 12% improvement
3.6-litre Calais sedan 236g/km, 11% improvement
Marketing Director, Phillip Brook, Said "that the Omega is 1.2L/100km
more fuel efficient and emits 30 grams a kilometre less CO2 compared to the base model Ford Falcon XT automatic."
the type of technological advancements Holden has made with its new
3.0-litre and 3.6-litre SIDI engines the future is looking bright for them and the environment.
We look forward to putting the new engines and drive train through their paces in the near future.
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