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      12-04-2018, 02:14 PM   #1
nothingman
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Lightbulb THE ULTIMATE Turbo Upgrade Thread

With so little information on our forum regarding all of the different turbo upgrade options available, enthusiasts may not recognize the many options available for the N55 M2. This thread is an attempt to compile all of the upgrades currently available on the market to help you when choosing which route you may want to go.

Turbo upgrade options for the N55 loosely fall into three turbo stages. These stage definitions are exclusive to the N55, as stages on different motors often have different meanings.
Stage 1: Hybrid turbo using stock housing with an upgraded compressor wheel. Similar spool to stock with more headroom to breath at higher rpm. Estimated 40-75hp gain.

Stage 2: Hybrid turbo using stock housing with larger upgraded compressor and turbine wheels. Typically have a slight delay in turbo spool (lag) from 300-700rpm but provide much better power to redline. Estimated 100-150hp gain.

Stage 3: Completely new turbo and manifold. Many of these kits were designed for other N55 applications and may require fabrication to fit onto the M2. Usually comprised of a ball bearing turbo with quick spool and higher overall hp potential. Estimated 150-400hp gain dependent on turbo selection.
Shortcut to each manufacturer's post:
I have gathered as much information as I could find on each available option and created the following spreadsheet. I welcome any additional information, corrections, etc. which may be helpful:

https://docs.google.com/spreadsheets...it?usp=sharing

Disclaimer: I do not proclaim to be a turbo expert and am gathering the following information as a jumping off point for discussion and knowledge gathering. Feel free to add your own comments and expertise.
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Last edited by nothingman; 02-17-2021 at 01:51 PM..
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