LAPTORR Hi-Flow Turbos for S55/Upgrade with GCG

LAPTORR High-Flow Turbo / GCG Upgrade for
S55 Engine

　
[Compatible Models]

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

Sales Style
We take your stock turbocharger, replace the compressor wheel and turbine wheel with larger ones, and modify the stock turbo housing to increase airflow.
All OEM parts can be reused.
Installation is possible without reinforcing major engine components.

Torque Characteristics of DME Tuning
With DME tuning, the S55 engine delivers intense acceleration up to around 4,500 rpm, but once it exceeds 4,500 rpm, the acceleration becomes smoother, and it feels as though the engine is coasting up to redline.
This occurs because the stock turbo’s maximum air intake capacity is reached around 4,500 rpm; as RPM increases, the air-to-fuel ratio decreases. Since peak power is achieved above 6,000 rpm, the car continues to accelerate, but the drop in torque causes the acceleration to become sluggish.
A high-flow turbo upgrade is recommended if you want to minimize this torque dip and achieve smooth acceleration all the way up to high RPMs.

Power Balance
Compared to the stock setup, torque is overwhelmingly higher in the high-rpm range (above around 3,500 rpm), but low-rpm torque remains roughly on par with the stock level.
When compared to a DME-tuned vehicle, the tipping point is around 4,500 rpm.
The engine runs smoothly and is easy to control from low to high RPMs, and the engine revs up particularly quickly in the high-rpm range.
　
DME tuning on the actual vehicle is required for a power boost.
It is difficult to achieve a sufficient power boost by upgrading the turbocharger alone.
DME tuning commensurate with the upgraded turbocharger is necessary.
Although results vary depending on measurement conditions (such as air temperature and atmospheric pressure) and tuning specifications, the power output is approximately 620–670馬力 without correction for actual rear-tire measurements.
　
GCG Upgrade
This is a LAPTORR-exclusive specification and differs from standard GCG products.
All upgrade work—including machining, assembly, and balancing—is performed by GCG JAPAN.
　
Purchasing Information
Please remove only the turbo unit from your vehicle and ship it to us.
If you would like us to perform the installation as well, please feel free to contact us.