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FREQUENTLY ASKED QUESTIONS (FAQ)
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No, the hole between the oil drain flange and coolant port is not a product defect and does not impact the structural integrity of the CHRA. The hole is NOT perfectly round and measures 3 to 4 mm in diameter.
During the CHRA machining process, the oil drain flange is tapped with the proper thread pattern and at the leading edge of the threads, the holes are designed to "break through" the casting at various points. The "hole" is one of the points where the casting is designed to break through. Typically, it will break "all the way" through which makes it look less like a "hole". But because there is extra material that remains around the tip of the machined area, it looks like a hole. That hole is "external" to the CHRA and has absolutely no bearing on the structural integrity or the internal operation of the CHRA itself.
So, regarding this hole... you have absolutely nothing to worry about!
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Garrett T04B frame compressor housing air leak (between compressor housing and backplate) causes a significant negative impact to perfromance? Display Answer Hide Answer |
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No, Garrett designed the GT and GTX series turbochargers with a "T04B" frame size compressor housing (.60 A/R, 3 inch inlet and 2 inch outlet hose connections) without a o-ring at the contact point between the compressor housing and backplate. The contact point was intended for a metal to metal interface with minimal amount of air leakage designed into the system. As a result, the contact point has a minor leak during a boost pressure test of the charge pipe system. The leak is 100% normal and factored into the performance of the turbo. The leak causes a neglible loss in pressure and will not cause a measurable impact to the turbo's perfromance.
The Garrett "T04B" frame size compressor housing is commonly found on Garrett GT28 and GTX28 series turbocharger models. Additionally the "T04B" frame is available as a compact housing option for the Garrett GTX29, GT30, GTX30, GT35, and GTX35 series models. Numerous turbo kits require the "compact" compressor housing to fit a Garrett performance turbo into a limited space engine bay.
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The 'CHRA' (Center Housing Rotating Assembly) is the TURBOCHARGER less the turbine housing and compressor housing. A CHRA can be a the quickest most efficient way to 'renew' the turbocharger to essentially NEW state. By assembling a new CHRA into your old end housings, your turbo can be up and running with 100% brand new internal parts in very little time. Renewing via a factory NEW Garrett CHRA is better than rebuilding from a reliability standpoint because EVERYTHING on the critical assembly of the turbocharger is new. All parts such as, bearing housing, bearings, seals, shaft, wheels, etc. are ALL NEW! There are no re-used components when buying a NEW Garrett CHRA. The new rotating assembly is factory assembled by the same process in the same factory that built the original unit to the same (high) standards. The NEW CHRA will also have its own P/N and with a NEW SERIAL as it did when the turbocharger was delivered new from the factory.
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"Supercore" - Often referred to as a "core" (CHRA) assembled complete with a compressor housing.
The "Supercore" is the TURBOCHARGER less the turbine housing. Buying the supercore separately allows you to purchase the turbine housing of your choice separately or from a different supplier.
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