S58 Turbo Information

Latest update: 6th of October, 2023.

Please read this carefully before installing the Mosselman S58 Upgrade Turbocharger Set.
Ignoring this information can lead to premature Turbocharger failure.

Our S58 turbochargers are engineered and produced with the latest technology for performance and durability. Nevertheless using the product in a way that is not intended can lead to instant failure. Therefore we added this guideline specifically for this set of upgraded Turbochargers installed on the BMW S58 engine. Besides basic installation instructions and recommendations, we want to highlight some standard features found in the original ECU that can send the turbocharger in to “surge” pretty aggressively at high power and boost levels. Surge can be very powerful and has the potential to destroy any turbocharger in under a minute.

Before installation check the car carefully on the following points:

  • Oil condition, if the oil is/was polluted (check oil filter if any small metal parts are in there)
  • Check the car on boost leaks
  • Check the oil cooler if it is clean (for cooling capacity)
  • Exhaust system on blockage (clocked up catalytic converters, exhaust valve not opening)

During installation

  • Pre-lube the turbochargers prior to the first start-up
  • Change the oil and oil filter (recommended oil 5W40 / 10W40 fully synthetic)
  • Replace the oil feed line
  • Replace the oil return line

After installation

  • After installation check the boost pressure and oil temperatures

Mapping instructions for your tuner/calibrator:
Avoid or at least minimize throttle closure as a result of ''torque intervention/limitation'' during full load/high boost acceleration (probably reaching load limit). This will lead to a very high pressure before the throttle and over the compressor side with a fully closed wastegate/almost fully closed wastegate (High boost). This turbo setup is not using a BOV or bypass valve over the compressor by factory design. Rapid pressure changes over the compressor (very high pressure ratio) with low mass air flow will lead to surge and will lead to Turbocharger failure.

In our experience, this specific danger will increase as the boost levels increase. Take your time to make sure you master your boost maps to minimize target overshoot, especially on setups going over 2.4 bar/35psi.


Feel free to contact us if you have any questions about the installation/mapping of this turbocharger set.