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Turbochargers

A turbocharger, or colloquially turbo, is a turbine-driven forced induction device that increases internal combustion engine's efficiency and power output by forcing extra air into the combustion chamber. This improvment over a naturally aspirated engine's power  output is due to the fact that the compressor can force more air - and proportionately more fuel - into the combustion chamber than atmospheric pressure (and for that matter, ram air intakes) alone.

We offer comprehensive repairs to a large range of turbochargers.

And can supply new turbochargers should a complete replacement be required , however we will more often than not be able to repair the unit.

All turbos are assembled to a strict standard with quality parts.

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Turbochargers for Petrol and Diesel Motors

Turbochargers are used widely on both petrol and diesel motors to improve performance and economy.

Turbochargers in diesel motor vehicles are used for improvements in power, fuel economy, noise reduction, vibration reduction, and harshness reduction in both small and large capacity turbo-diesels. Over the last decade these improvements have spurred their widespread adoption in the South African market.

Turbo-diesels are generally considered more flexible for automotive uses than naturally aspirated diesels, which have strong low-speed torque outputs but lack power at higher speeds. Turbo-diesels can be designed to have a more acceptable spread of both power and torque over their speed range or, if being built for commercial use, can be designed to improve either torque or power at a given speed depending on the exact use. Naturally aspirated diesels, almost without exception, have a lower power output than a petrol engine of the same capacity whilst at the same time requiring stronger (and thus heavier) internal components such as the pistons and crankshaft to withstand the greater stresses of the diesel engine's operating cycle.

These factors give naturally aspirated diesels a poor power-to-weight ratio. Turbocharger units weigh very little but can offer significant power, torque and efficiency improvements. Fitting a turbocharger can bring a diesel engine's power-to-weight ratio up to the same level as an equivalent petrol unit, making turbo-diesels desirable for automotive use, where manufacturers aim for comparable power outputs and handling qualities across their range regardless of the type of power unit chosen.

How a Turbocharger Works – Brief Description

A turbocharger uses an engine’s wasted exhaust gas to drive a turbine wheel at speeds up to 280,000 rpm.

The turbine wheel is connected by a shaft to a compressor wheel and the two wheels turn together to suck in and compress large amounts of ambient air. This air is very dense and very hot, so it is passed through a charge-air cooler, where it cools and gains even higher density before entering the engine. The presence of this compressed air makes the fuel burn more efficiently, delivering greater power while consuming less energy.

As a result, more power can be generated from smaller displacement engines – and ultimately this means better fuel efficiency. Increasingly, turbos are coupled with high pressure fuel injection systems, which makes for even more thorough, efficient and cleaner combustion.

Although the underlying concept of turbocharging is simple, its application is extremely complex.

In a wastegate turbo, an actuator is used to open and close a by-pass valve to divert exhaust gas. This ability to restrict the amount of gas reaching the turbine makes it possible to regulate boost by controlling the rotating speed of the compressor.

VNT™ turbo In a Garrett® VNT™ turbo, a row of moveable vanes positioned around the inlet of the turbine wheel can be adjusted instantaneously to vary the exhaust gas flow through the turbine wheel. As a result, it is possible to regulate the flow of gas to make a VNT™ turbo act like a small turbo at low speeds – thereby supplying greater levels of engine boost – while at higher speeds, the turbo configures itself automatically to deliver the performance of a larger turbo.

Parallel Sequential Dual-Stage SystemIn a Garrett® parallel sequential two-stage system, two small turbos work side-by-side – one turbo delivers boost at low rpm and both work together at high rpm.

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