Porsche 991.1 4.0L Boxer 6 ECU Tune

Product Description

Porsche didn't ease into building the 991.1 GT3 RS's 4.0L flat-six. They went straight to the source and pulled its crankshaft directly from the 911 RSR race car, stretching the stroke to 80.4mm to make it work. The result is one of the most uncompromising engines Porsche has ever put a warranty behind: solid-mounted to the chassis, dry-sumped for track-day oil control, and free-revving all the way to a 9,000 rpm redline, with output that sat right alongside the contemporary GT3 Cup race engine. This is about as close as a factory-backed, license-plated road car gets to genuine racing hardware, and Porsche built it that way on purpose.

Weistec's ECU tune takes that motorsport-grade foundation and pushes it further through a full software recalibration built with the same rigor and validation standard Porsche applied to the original mapping. Every knock-protection strategy, thermal management routine, and OEM diagnostic function stays exactly as the factory engineered it. What changes is the fuel, ignition, and throttle mapping underneath, refined until this already race-derived engine wakes up roughly 16 additional horsepower and 11 lb-ft of torque it had been holding in reserve. An engine this special deserves a calibration this precise, and that's exactly what it gets.