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Turbo Oil Restrictor


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I purchased a 2009 T2 that was already turbo charged. WHile repairing some bad workmanship on the welds for the exhaust manifold I noticed there is a home made resrticted fitting on the pressure side oil feed for the turbo. Is this normal? It looks really small ( they used a carb jet) for the speed this turbo spins and I beleive it needs to be removed but wanted to check and see if anyone has the same thing.

Thanks for any insite you can give me.

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answer is very dependent on what brand/style of turbo is being used...the use of a restrictor is very common on ball bearing turbos,and some journal bearing turbos ...without the restriction,when oil pressure increases,the flow into the turbo can exceed what the drain can get rid of causing the oil to push past the turbo seals and smoke really heavy...I believe the common restrictor size for garret turbos is .065...as a side note,we have noticed a few of the chinese turbos running without any form of restrictor,that definitely effect the troopers oil pressure (lower it)

just a link I found to show 1 of the styles

Oil Inlet Restrictor - .065" hole size 1/8" NPT (for Journal bearing and larger GT BB) : atpturbo.com

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