LAPTORR Hi-Flow turbos for S55/Upgrade with GCG

LAPTORR High-Flow Turbo / GCG Upgrade
For S55 Engines

　
【Applicable Models】

BMW F80-M3 Sedan
BMW F82-M4 Coupe
BMW F83-M4 Convertible
BMW F87-M2 Competition

Sales Style
We take your genuine turbocharger and modify it for high flow by replacing the compressor wheel and turbine wheel with larger sizes and machining the genuine turbo housing.
All OEM parts can be reused.
Installation is possible without reinforcing major engine components.

DME Tuning Torque Characteristics
The S55 engine delivers intense acceleration up to around 4500rpm with DME tuning. However, beyond 4500rpm, acceleration becomes more subdued, feeling like it's coasting to redline.
This occurs because the stock turbo's maximum air intake capacity peaks around 4500rpm. As RPM increases, the air charge efficiency decreases. Since peak power occurs above 6000rpm, acceleration continues but slows due to reduced torque.
Upgrading to a high-flow turbo is recommended to minimize this torque drop and achieve smooth acceleration all the way to high RPMs.

Power Balance
Compared to stock, torque is significantly higher above around 3500 rpm, while low-end torque remains roughly stock-level.
Compared to DME-tuned vehicles, the crossover point is around 4500 rpm.
It provides smooth control from low to high rpm, with notably quicker engine response at high revs.
　
Power upgrades require on-vehicle DME tuning.
Simply upgrading the turbo alone is unlikely to yield sufficient power gains.
DME tuning matching the upgraded turbo is necessary.
Depending on measurement conditions (air temperature, pressure) and tuning specifications, actual horsepower measured without rear tire correction ranges from 620 to 670 hp.
　
GCG Upgrade
This is LAPTORR's proprietary specification and differs from GCG products.
All upgrade work—machining, assembly, balancing, etc.—is performed by GCG JAPAN.

Purchase Information
Please remove only the turbo unit from your vehicle and ship it to us.
If you also wish to request installation work, please feel free to contact us.