Twin-Scroll Turbocharger, Gasoline Direct Injection Technology Applied To Hyundai Veloster

As you might expect, the 2014 Hyundai Veloster Turbo has a lot going on under the hood, with the power coming from a 1.6L turbocharged, direct-injected four-cylinder engine that produces 201 horsepower at 6,000 rpm and 195 lb-ft of torque from 1,750 rpm.

While many of Hyundai’s major competitors use premium fuel to run the engine and deliver power to the wheels, the sporty Veloster 3-door coupe does it with regular fuel.

The 1.6L GDI turbo engine features a twin-scroll turbocharger combined with a direct injection system. The end result is a more responsive power delivery and minimal turbo lag.

It is usually expensive high performance cars that get the twin-scroll turbocharger treatment, but Hyundai is now using the technology across its lineup, whilst still maintaining affordability.

The design of the twin-scroll turbocharger features a pair of gas inlets that are divided by split walls in the turbine housing.

Both passages are controlled by a wastegate. More energy is recovered from the exhaust than you would expect to find in a single-scroll turbocharger.

The twin-scroll design separates the cylinders whose exhaust gas pulses interfere with each other, resulting in improved pressure distribution in the exhaust ports and a more efficient delivery of exhaust gas energy to the turbocharger’s turbine for quick and smooth responsiveness.

A photo above showcases the all-new Veloster R-spec.

For example, at the start of the intake stroke of cylinder one and when both the intake and exhaust valves of cylinder one are open (valve overlap period), cylinder three already starts its exhaust stroke with the exhaust valve open.

If cylinders one and three were connected, what would happen would be that the exhaust gas pulse in three would increase back pressure in one.

The end result in that case would be a reduction in fresh air induction and an increase in the amount of hot residual gases inside the cylinder. The twin-scroll setup minimizes the amount of interference.

The final result of this setup is an improvement in pressure distribution in the exhaust ports and improved delivery of exhaust gas energy.

Both of these allow for greater valve overlap, with the quantity and quality of air entering the cylinders also improved. Denser, purer air is also packed into each cylinder, giving the turbocharger a maximum boost of 18.0 psi.

6-Speed Dual-Clutch Transmission

Hyundai has also strived to maintain their reputation for delivering fuel efficiency, which they have achieved by pairing their turbo engine with a 6-speed manual transmission or a six-speed EcoShift dual-clutch transmission -DCT developed inhouse by Hyundai-Kia Automotive Group engineers.

Torque Vectoring Control

Hyundai has also introduced a Torque Vectoring Control system in the Veloster coupe.

This active cornering feature, utilizing capabilities from the electronic stability control and powertrain control systems, allows the car to improve dynamic cornering during more enthusiastic driving.