Optimizing Turbo Oil Feed: Dual Ball Bearing vs. Journal Bearing Setups

Correct Oil Feed Setup for Dual Ball Bearing Turbos

Dual ball bearing turbochargers are renowned for their efficiency in boosting vehicle performance. To ensure their optimal functioning, it’s imperative to have the right oil feed setup. An oil restrictor or even an oil pressure regulator is highly recommended for these turbochargers. These devices ensure that the turbocharger receives a consistent oil pressure of 40 – 45 psi at maximum engine speed, which is crucial to prevent potential damage to the turbo’s internals.

When using an oil restrictor to achieve this specific pressure range, one with a 0.040” orifice is typically employed. However, it’s essential to always verify the oil pressure entering the turbo after the restrictor. The ideal oil feed for such turbochargers is a -3AN or -4AN line, complemented with a hose/tubing of a similar ID. Additionally, always opt for a high-quality oil filter that meets or surpasses OEM specifications.

Ball Bearing vs. Journal Bearing Turbos

While ball-bearing turbochargers are known for their efficiency, journal-bearing turbochargers also play a significant role in the automotive world. The oil feed setups for these two types of turbos have distinct differences.

For ball-bearing turbochargers, the emphasis is on maintaining a specific oil pressure, achieved using an oil restrictor. In contrast, journal bearings, which function similarly to engine rod or crank bearings, rely predominantly on oil pressure for their smooth operation. Unlike their ball-bearing counterparts, journal-bearing turbochargers generally don’t require an oil restrictor, except in cases of oil-pressure-induced leakage.

The recommended oil feed for journal-bearing turbochargers is a -4AN line or hose/tubing with an ID of approximately 0.25”. As with ball-bearing turbos, it’s also vital to use a top-tier oil filter that meets or exceeds OEM standards.

In conclusion, while both types of turbochargers play crucial roles in vehicle performance, understanding their distinct oil feed setups is essential for ensuring their longevity and optimal performance.

An Oil Feed Flange with a Restrictor Build-In

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