VTT BMW S55 “GCMAX” Turbocharger Upgrade

VTT “GC-MAX” Turbocharger Upgrade – BMW S55 (Twin Turbo)

Supported Power Level (Stock Engine): Up to 1000WHP
Base Architecture: Twin Garrett G25-660 Spec
PTE Style Wheel Designation (Comp/Turb): 67/54

Overview

VTT takes the S55 platform to the next level with our “GC-MAX” evolution of the record-setting GC Series. Based on everything learned from the GC / GC+ programs, GC-MAX pushes the limit of what is possible while retaining full bolt-on, factory-location packaging.

Internal flow paths have been enlarged significantly. A/R is optimized. Inlet diameter is maximized to 2.5”. Compressor is increased to 67mm. Most importantly — the turbine housing has been completely retooled to accept our 54mm G25-series turbine wheel used on the G8X S58 GC+ and F9X GC series. This turbine is the key to GC-MAX power — extremely low backpressure, rapid spool, and capability far beyond any turbine wheel of similar size.

This same wheel architecture has already pushed 1000WHP+ on S58 / S63 based applications — and has gone 9.44 @ 146mph on a stock motor / stock drivetrain G80. GC-MAX gives the F8X owner a true bolt-on 1000WHP solution without going single turbo and without losing factory response, packaging, or reliability.

Key Design Features

• All new housings with increased flow capacity, A/R revision, and improved aero vs GC/GC+

• 310 Stainless Steel turbine housings for maximum thermal & corrosion durability

• 54mm G25 Spec Mar-M 246 9-blade Superalloy Turbines

• 67mm 9-blade point-milled Compressor Wheels optimized for maximum flow with surge resistance

• Direct bolt-on to all factory oil / water / downpipe / charge pipe connections

• Redesigned bearing housing oiling + upgraded thrust assembly

• No core charge — your factory units are yours to keep or resell

• Production units will be kept in stock for same/next day shipment (verify at order time)

• 12-Month Unlimited Mileage No-Hassle Warranty (material/workmanship defects)

Package Includes

• 1x set VTT GC-MAX Turbochargers

• 1x set VTT GC-MAX Silicone Intake Tubes

Recommended Supporting Modifications

Fuel system enhancements, upgraded intake, downpipes, intercooler, and proper ECU calibration are strongly advised. Gains will occur even on otherwise stock setups — but full potential requires proper supporting components.

Fitment

• 2016–2019 F87 M2 LCI

• 2012–2015 F80 M3

• 2015–2018 F80 M3 LCI

• 2013–2017 F82 M4

• 2016–2019 F82 M4 LCI

• 2013–2017 F83 M4

• 2016–2019 F83 M4 LCI