2018 Volvo XC60 D4 vs. D5 Race Suggests PowerPulse Is Useless

The previous XC60 was cheap, reliable and became Volvo's best selling model. However, this all-new model features more complex 2.0-liter engines that try to compensate for their smaller displacement with complex forced induction systems.

The previous D5 model came with a 2.4-liter twin-turbo 5-cylinder diesel engine producing 220 HP. But because Volvo basically only makes one engine now, it's been downsized to a 2.0-liter.

The new D5 is supposed to make 235 HP and to get around potential lag problems, it's been fitted with a tank of compressed air that will spin the turbos faster. We tracked down one of the official videos, which suggested it would have instant throttle response and much better acceleration.

Still, when Mat Watson organized a drag race between the XC60 D4 and D5, the results were less conclusive. Yes, the D5 is eventually faster because of its extra power, but the two have identical performance off the line. And it's the same story in the case of the rolling race.

This leads the reviewer to suggest that you don't need to spend extra and have the D5 engine, a fact with which we agree. The money would be put to far better use upgrading to the Inscription trim level, which just makes you feel like you're driving a special luxury vehicle, thanks to superior leather, better equipment, and air suspension. However, we don't think the Momentum is that shabby.

Getting back to the problem of the PowerPulse system, we have a theory about what's going on. The tank of compressed air is at the bottom of the engine, and it takes time for its output to reach the turbocharger. Companies from all over the world, not just carmakers like Volvo, invested billions to ensure turbochargers are cutting-edge technology. A "can of air" probably isn't the fix you're looking for.