W.3 Turbo Upgrade ECU Tuner

The Weistec W.3 Turbo Upgrade is a performance enhancement for the Mercedes M139 engine, designed to deliver substantial power gains while maintaining a stock appearance. This upgrade involves sending your factory turbochargers to Weistec for a precise machining process. The compressor cover and center cartridge are modified to accommodate a new 5-axis CNC-machined impeller wheel, which supports greater power levels with minimal sacrifice in spool or response. Once machined, the turbochargers are reassembled with new seals and balanced for smooth operation and OEM service life. For those who prefer not to send their turbos first, a core exchange option is available. The advertised gains are estimates, with the potential for up to +205 HP and +239 TQ from the stock 385 HP and 331 TQ. Key features of the W.3 Turbo Upgrade include 5-axis CNC machining, high RPM balancing, substantial power throughout the RPM range, a stock appearance, and a 100% bolt-on installation process (after your original turbos are modified or exchanged). It's important to note that custom tuning and proper supporting upgrades are required for optimal results and performance. Weistec recommends a W.3 ECU calibration, TCU tune, downpipes, and potentially other supporting modifications for maximum performance. This turbo upgrade is not legal for sale or use on pollution-controlled motor vehicles in all US states. Additionally, please allow 2-4 weeks for orders to be shipped as your turbochargers must be sent to Weistec for the upgrade process, or a core charge will apply if opting for the exchange.