For example, if during normal acceleration your turbo boost climbs consistently as your car accelerates and reduces slowly once you stop pressing down on the accelerator, this is what is supposed to occur. If your turbo boost drops quickly or rises quickly without the application of the throttle, it could be caused by a blockage in the wastegate or a broken wastegate hose.
If this is the issue, it's likely that you'll have to replace the wastegate hose. One of the best advantages of buying a turbocharged diesel engine is that, for the most part, they produce exceptional fuel economy.
However, when the wastegate hose is broken, leaking or blocked, it will cause more raw fuel to be expelled from the exhaust system without being burned. This will result in a rapid loss in fuel and significantly reduced fuel economy. If you notice that you're filling up the fuel tank more frequently than normal, contact a certified diesel mechanic in your area to replace the wastegate hose or inspect your vehicle for other damaged components within your turbocharger.
Turbocharged engines are fine-tuned machines that need to be maintained more frequently than traditionally fuel injected vehicles. If you notice any of the above warning signs, contact a mechanic as soon as possible to avoid additional damage to your turbo or engine. This article originally appeared on YourMechanic. Autoblog is partnering with YourMechanic to bring many of the repair and maintenance services you need right to you.
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Thanks for that. And thanks for reading Autoblog. Here are some common symptoms and warning signs that may hint towards having a worn out wastegate hose : 1. Vehicle's turbo does not produce boost during acceleration If you've driven a turbocharged engine before, you'll easily understand the difference between an engine that is engaging the turbo and one that is not working properly.
As hot exhaust gas exits the cylinder head, it expands and rotates the turbine wheel in the same fashion that a river operates a water wheel.
Since the compressor is on the same shaft, as the turbine rotates, so does the compressor wheel. The turbine is the drive member, while the compressor is the driven member. The action of the compressor sends air into the induction path of the engine, which has two important effects. It raises the pressure that enters the cylinder to above atmospheric pressure, and it increases the volume of airflow into the engine measured in cfm cubic feet per minute. The cumulative effect of the increase in pressure and the mass of the incoming air result in the boost pressure.
The speed of the turbine and, in turn, the boost pressure is controlled by the exhaust gas flow and temperature. A need to regulate the pressure is required and is accomplished in most applications with a wastegate. If there were no means to control boost pressure, it is possible through a series of events that the cylinder pressure could exceed safe limits for the engine design.
The wastegate is employed to control boost pressure via bypassing a controlled amount of exhaust gas from interacting with the turbine wheel. It consists of nothing more than a disk that closes against a passageway that redirects a portion of the exhaust flow. When the passage is open, boost pressure is limited. When it is closed, the full potential of the turbocharger can be realized. It must be recognized that every turbocharger is a sophisticated piece of engineering since there is a dedicated science to the shape and size of both the turbine and compressor wheels.
The airflow and pressure potential are created by the design of the two wheels and, as with every aspect of engineering, there are compromises. The wastegate allows the engineer to create a turbocharger that can deliver the desired performance at low- to mid range engine speeds while not overboosting under full engine load. It can also allow the turbine wheel to accelerate quicker at low exhaust flow and temperatures, bringing in boost pressure sooner and making the engine more tractable when being lugged.
An additional benefit of turbocharging beyond engine power is a general reduction in engine emissions and improved efficiency. The increased air pressure and flow into the cylinder creates more turbulence in the bore and, in turn, improves flame speed and mixes the fuel and air more thoroughly.
The wastegate allows an engineer to use the mixture motion to decrease emissions while also keeping the combustion pressure in check. Yet, the wastegate cannot accomplish this all by itself. A turbocharger, when equipped with a wastegate, also uses an actuator. Usually reserved for higher power engines fitted to performance and race vehicles, external wastegates are separate, self-contained mechanisms that are usually fitted to the exhaust manifold or header. External wastegates feature larger inlets and outlets, higher pressure springs and larger actuator diaphragms, so that they can effectively handle higher boost pressures.
Whilst perfectly sufficient for the vast majority of motorists, internal wastegates are only designed to handle the performance of a turbocharger at stock boost levels. If all this talk of turbocharger components has you baffled, then take a look at our beginners FAQ, covering some of the more basic aspects of turbocharging, followed by turbo technology, which looks at some of the key components and what they do!
For assistance on any aspect of turbocharging, call us today on , or email info aet-turbos. In addition, our sister company AET Motorsport offers a range of top quality internal and external wastegates from Turbosmart, and can provide expert advice on the right components, in addition to fitting and configuration support to help you achieve your goals. Visit the AET Motorsport website for further information. T F E info aet-turbos.
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