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TU Ultimate 4-Puck Ceramic Race Clutch Kit (StageIV)
TU "Ultimate" Performance 4-Puck Ceramic Stage IV (Black) Race Clutch kits are made exclusively for us and to our unique specifications. Most other c ...
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August 22, 2008
Why is my exhaust smoking??
Why is my exhaust smoking??
EXHAUST STILL SMOKES: There are many things, which could cause a new or rebuilt turbo to smoke. Here are just a few common causes and their solutions: #1 Cause: Existing oil in exhaust system still burning off from previous turbo failure. Solution: Continue running car until smoke disappears. Plan on replacing Catalytic convertor soon because burnt oil will quickly restrict air flow and lead to other problems later including turbo failure. #2 Cause: Oil pressures build up in Turbo Bearing Housing caused by one or all of the following reasons: 1) Restriction in oil drainback tube/line. 2) Oil feedline pressure exceeds drainback tube capabilities. 3) Blow-by in crankcase caused by worn engine, cracked pistons, rings, faulty PVC systems, etc. Solution: 1) This could be caused by one or all of the following three things: a) Wrong type of drainback hose. Verify there are no foreign objects in drainback tube/hose. This could be the paper towel or duct tape you placed there during the removal of your original turbo to prevent anything from falling in to your oil pan during the swap. This also includes not using the factory silicon drainback hose. These are heat and oil resistant hoses where most other hoses cannot withstand these extreme conditions for very long. Most automotive hoses are actually 2 hoses (inner and outer) separated by braided nylon. When this is used in place of the silicon hose the nylon can actually shrink from the heat restricting the inner hose while leaving the outer hose looking perfect from the outside. Use the factory hose whenever possible. There are no advantages to using any other type of hoses for this application. Turbo removal not required. Once issue is addressed piston seals should reseat on their own and oil seepage will no longer be a problem. b) Oil return flange gasket issues This is a “dry” gasket so do not use RTV on it. Even the slightest bit that may get squeezed into the flow of the return oil will impede the gravitational flow of oil back into your oil pan. Pressure will build up in the turbo bearing housing to the point where oil is pushed past the seals. Remove all RTV from the area and replace the gasket. Seals will reseat on their own. c) Wrong oil drainback line angle. Turbo oil drainback is powered only by gravity. Angles in excess of 20 degrees will impede oil return flow and pressure build up in the bearing housing may result. Also be sure to maintain a smooth curve from turbo to engine and prevent any kinks in the line, which may cause a back-up and eventual pressurization of the bearing housing. 2) Verify oil pressure is not excessive. 60 PSI at idle for a warmed up engine is WAY too much. 10psi per 1000 RPM is a good rule of thumb. To much oil can pressurize the turbo bearing housing if the gravity fed drainback cannot keep up. This pressurization will force the oil past the turbine shaft piston seals and into the exhaust or compressor side of the turbo. Over time, too much pressure can actually be harmful to your entire engine. With excessive pressure, impurities in your oil can actually eat away at your bearing surfaces and increase tolerances much like extrude honing works. Conclusion: Don't use the MP Oil Pressure Relief Spring Kit unless you absolutely have to but remove it right away if your turbo smokes. Turbo removal not required. Once issue is addressed piston seals should reseat on their own and oil seepage will no longer be a problem. 3) Crank cases pressurized by blow-by can also cause oil to be forced past the turbine shaft piston seals. Complete a compression check and leakdown test to check the condition of your engine. There is also a blow-by detection tool which is placed over the oil cap opening while the engine is running and measures crank case pressures. Be sure to inspect your crank case evacuation system to make sure the issue is not being caused by a bad PVC valve. If you find your oil dipstick out of the tube a few inches after some spirited driving you are most likely experiencing blow-by. Turbo removal not required. Once issue is addressed piston seals should reseat on their own and oil seepage will no longer be a problem. If you have any questions about the above don’t hesitate to contact us. GOOD LUCK! Chris-TU 602-76-BOOST
General Tech Support and Inquiries : Chris@turbosunleashed.com