The 2.5-litre models have been upgraded with the latest quad cam version of Subaru’s boxer engine.
This was originally introduced in the Forester last year and a 2.0-litre derivative has been fitted to the new Impreza and XV models launched earlier this year.
This new engine has 4 kWs more power – up to 127 kWs – than the SOHC motor which has powered the Legacy and Outback 2.5 until now. Torque has risen 6 Nm to 235 Nm. This motor has chain-driven camshafts, reducing servicing costs. The 100,000km cambelt change which costs around $700 is no longer required.
But the main benefit is in the improved fuel economy and lower exhaust emissions. The overall fuel economy of the Legacy 2.5 sedan has been reduced 6.3% and is now 7.9 L/100 kms, having dropped from 8.4 L/100 kms. And the Legacy wagon and Outback 2.5 has improved 5% from 8.4 to 8.0 L/100 kms.
The more efficient operation of the new double overhead camshaft motor produces more mid-range torque from 2500 rpm. And some of the better economy has been provided by improvements to Subaru’s Lineartronic Transmission. It is now lighter and more compact with less internal friction.
“We have already proved the economy of the outgoing powertrain in the 2010 Energywise Rally,” says Wallis Dumper, managing director Subaru of New Zealand.
In that event a Legacy 2.5 with Lineartronic transmission recorded 6.54 L/100kms over four days of competition around the North Island over a wide variety of terrain. And an Outback achieved 6.81 L/100kms, well under their combined fuel consumptions of 8.4 litres/100kms
“We expect these revised 2.5-litre Legacy and Outbacks to perform even better when driven with economy in mind,” says Dumper.
The 2013 Legacy and Outback are also cleaner running with 8.8% improvements in CO2 emissions - down to 182 g/km compared to 198g/km for the outgoing Legacy sedan. This new engine meets Euro 5 emission control regulations.
While the main change to the 2.5 models has been the new engine and revised transmission, the turbocharged Legacy GT Spec. B and the six cylinder 3.6-litre Outback and Legacy sedan have “EyeSight” safety technology for the first time.
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