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[quote][i]Algselt postitas: Maku[/i] [b]SJM copy/paste[/b] Exhaust System Issues You should have the exhaust back pressure checked by a muffler shop if you have low boost conditions and suspect a plugged catalytic converter or muffler/exhaust system. They can use the pre-catalytic converter sniffer pipe bolted to the intake manifold to do this, or they can drill a small hole in the exhaust pipe to insert the pressure gauge pipe. A low pressure (0-10 psi) fuel pump pressure gauge can be used for this. Typically with the car idling in neutral, as you slowly rev the engine to 4000 RPM and hold it at 4000 RPM, the exhaust back pressure should not increase above 1-2 psi. If you run a long hose from the sniffer pipe to a gauge inside the car, an assistant can check the exhaust back pressure while you drive the car. Test Example: When the car is driven and under load in 3rd gear at WOT and near redline, it is not unusual to see over 4-7psi of back pressure when running 1.8 bar of boost pressure. The older catalytic converters can create some of this back pressure and may need to be replaced as the car gets over 75K miles. [b]The RS2 type exhaust manifold is recommended for improving the exhaust flow out of the head and rumor has it, to prevent burned exhaust valves when more extensive ECU and Turbocharger mods are performed.[/b] As mentioned, the catalytic converter and muffler system can get plugged or restricted over the life of a car which may cause poor running with low power. Catalytic Converter meltdown can occur if extremely rich mixture levels occur in the combustion chamber which are not thoroughly burned which allows high levels of raw gasoline (Hydrocarbons) to pass into the catalytic converter. If this occurs under engine load conditions and is followed by normal lean running or idling the catalytic converter will get very hot and damage may occur. Ignition misfires can also dump raw fuel or hydrocarbons (HC) into the catalytic converter and this will also cause meltdown of the ceramic honeycomb material if the engine is driven under load. If you ever need a reminder to let your engine run after a high boost run, just open up your hood at night and see the red hot exhaust manifold and turbo! Even with the water cooled turbo you should let the car idle for several minutes. It may take 10-15 minutes of normal low boost driving before the exhaust manifold/turbo cool down. [b]It is a good idea to avoid high boost initially after starting a cold engine until the oil temp gets up to 60C[/b] (this is recommended in the factory operators manual). [/quote]
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Eesti Audi Klubi foorum
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S - Audid
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20vT - tuuning
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Väljalase
» Vasta
XMB Audi Club Edition
Täiendanud: indro, klem, j6mm & diversion @ 2002-2020
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