The recommended oil feed for journal bearing turbochargers is -4AN or hose/tubing with an ID of approximately 0.25”. An oil restrictor is generally not needed except for oil-pressure-induced leakage. Journal-bearings function similarly to rod or crank bearings in an engine – oil pressure is required to keep components separated. OIL LEAKAGE SHOULD NOT OCCUR ON A PROPERLY FUNCTIONING SYSTEM IF RESTRICTOR IS NOT USED UNLESS THE SYSTEM PRESSURE IS EXCESSIVELY HIGH. As always, use an oil filter that meets or exceeds the OEM specifications. Recommended oil feed is -3AN or -4AN line or hose/tubing with a similar ID. In order to achieve this pressure, a restrictor with a 0.040” orifice will normally suffice, but you should always verify the oil pressure entering the turbo after the restrictor to ensure the components function properly. Oil pressure of 40 – 45 psi at maximum engine speed is recommended to prevent damage to the turbocharger’s internals.
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How to determine filter size once you know the calculated areaĪrea (in²) = pleat height x pleat depth x number of pleats x 2Īctual Filter Area (594 in²) > Calculated Area (582 in²)Īn oil restrictor is recommended for optimal performance with ball bearing turbochargers.
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Volumetric Flow Rate (CFM) = Mass Flow (lbs/mn) / Air Density (lbs/ft³)įor twin applications divide the flow rate by 2įace Velocity (ft/min) = Volumetric Flow Rate (CFM) / Area (ft²)Īrea (ft²) = CFM / Face Velocity (ft/min) Mass Flow (lbs/min) = Volumetric Flow Rate (CFM) x Air Density (lbs/ft³) Overspeed will reduce turbo durability and could result in early turbo failure.Increased pressure ratio, which can lead to turbo overspeed.Oil leakage from the compressor side piston ring, which results in oil loss, a fouled intercooler and potentially smoke out of the tailpipe.If the turbo does not have access to the proper amount of air, excessive restriction will occur and cause: A target face velocity of ≤130 ft/min at redline is used to minimize restriction and to provide the turbo with the air necessary for it to function optimally.
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It is important to appropriately size the air filter for the maximum flow rate of the application.
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The most important things to understand before designing a system is the application use and your horsepower target. No matter what your experience level, you’ll find information that will help you with your specific application or simply increase your knowledge of turbos and turbos systems. The website has extensive information, both general and technical. It also contains News and what events we’ll be at throughout the year as well as a distributor locator. It contains tech tutorials written by the engineers from Basic, to Advanced, up to the Expert level where detailed formulas are used to plot operating points on compressor maps to help select the correct turbo. It explains Garrett’s model nomenclature, it goes over Garrett’s technology and product development as well as our involvement with OEM’s and Motorsports. It contains product information about turbos, intercoolers, and turbo kits. The website contains a lot of helpful information. System Optimization: A Guide To Setting Up Your Turbocharger