Description
Unlock the full potential of your M157 BiTurbo 5.5L or M278 engine with the Weistec ASV/WMI System, a premium upgrade designed for non-SUV and ABC-equipped vehicles. This dual-purpose system enhances engine performance and reliability by addressing turbocharger surge while providing significant cooling and knock prevention through water-methanol injection.
Key Features
1. Anti-Surge Valve (ASV)
From the factory, M157 and M278 engines lack bypass valves, exposing the turbochargers to harmful compressor surge during throttle closure. The Weistec ASV prevents this by venting compressed air to the atmosphere, eliminating backflow into the compressor housing.
- Protects turbochargers from damage caused by compressor surge.
- Produces the signature "blow-off" sound popular among enthusiasts.
- Operates using engine vacuum for seamless functionality.
2. Water-Methanol Injection (WMI) System
Boost performance with the proven benefits of water-methanol injection. Originally developed for aircraft engines, WMI has become a motorsport staple for turbocharged engines, offering cooling and knock prevention to maximize performance.
- Up to 100 HP Gains with proper tuning.
- Reduces intake air temperatures and prevents detonation.
- Progressive Water/Methanol Controller with built-in MAP sensor ensures precise, boost-dependent injection.
- Dual injectors deliver uniform cooling and improved consistency.
Complete Bolt-On System
The Weistec ASV/WMI System includes all the necessary hardware and components for a hassle-free installation. Designed specifically for M157 and M278 engines, it eliminates the guesswork and custom fabrication often required with universal kits.
Included Components
- Weistec Anti-Surge Valve: Protects turbochargers and delivers iconic blow-off sound.
- Red Powder-Coated Turbo Charge Pipes: Feature built-in injector bungs for easy installation.
- Water/Methanol Controller: Progressive controller with built-in MAP sensor for smooth operation.
- CNC-Machined Vacuum/Boost Adapter: Ensures accurate boost readings.
- Dual CNC-Machined Injector Bodies: Includes built-in check valves for reliable injection.
- Injection Nozzles: Small, medium, and large nozzles included for customization.
- 2.25-Gallon Trunk Tank: Features a racing cell cap, integrated pump mount, and spare tire well fitment for a stealthy installation.
- Quick-Disconnect Fittings: High-quality fittings for easy maintenance.
- Designed for a 50/50 Water and Methanol Mixture.
- All Hardware and Gaskets Included: Ensures straightforward bolt-on installation.
- Compatible with stock, W.3, and W.4 turbochargers.
Benefits at a Glance
- Improved Turbocharger Longevity: Prevent compressor surge with the Weistec ASV.
- Significant Performance Gains: Achieve up to 100 HP increases with proper tuning.
- Cooler Intake Temperatures: Reduce heat soak and enhance intercooler efficiency.
- Detonation Resistance: Protect your engine during high-performance operation.
- Stealthy Installation: Trunk-mounted tank fits discreetly in the spare tire well.
Compatibility
This system is tailored for M157 BiTurbo 5.5L and M278 engines in non-SUV models without ABC systems. For SUVs and ABC-equipped vehicles, a two-ASV configuration is available. Check vehicle fitment data for compatibility.
Vehicle application:
2020 Mercedes-Benz SL500 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2019 Mercedes-Benz SL500 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2018 Mercedes-Benz SL500 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2017 Mercedes-Benz SL500 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz SL500 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz SL500 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz SL500 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz SL500 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz SL500 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2020 Mercedes-Benz SL550 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2019 Mercedes-Benz SL550 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2018 Mercedes-Benz SL550 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2017 Mercedes-Benz SL550 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz SL550 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz SL550 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz SL550 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz SL550 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz SL550 Roadster (R231) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz E500 T-Modell (S212) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz E500 T-Modell (S212) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz E500 T-Modell (S212) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz E500 T-Modell (S212) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz E500 Coupe (C207) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz E500 Coupe (C207) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz E500 Coupe (C207) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz E500 Coupe (C207) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz E500 Cabrio (A207) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz E500 Cabrio (A207) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz E500 Cabrio (A207) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz E500 Cabrio (A207) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz E500 Cabrio (A207) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz E500 Base (W212) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz E500 Base (W212) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz E500 Base (W212) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz E500 Base (W212) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz E500 Base (W212) Twin Turbo 4.7L V8 (M278)
2017 Mercedes-Benz S500 Base (W222) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz S500 Base (W222) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz S500 Base (W222) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz S500 Base (W222) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz S500 Base (W221) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz S500 Base (W221) Twin Turbo 4.7L V8 (M278)
2011 Mercedes-Benz S500 Base (W221) Twin Turbo 4.7L V8 (M278)
2017 Mercedes-Benz S550 Coupe (C217) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz S550 Coupe (C217) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz S550 Coupe (C217) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz S550 Coupe (C217) Twin Turbo 4.7L V8 (M278)
2017 Mercedes-Benz S550 Base (W222) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz S550 Base (W222) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz S550 Base (W222) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz S550 Base (W222) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz S550 Base (W221) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz S550 Base (W221) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz CL500 Coupe (C216) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz CL500 Coupe (C216) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz CL500 Coupe (C216) Twin Turbo 4.7L V8 (M278)
2011 Mercedes-Benz CL500 Coupe (C216) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz CL550 Coupe (C216) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz CL550 Coupe (C216) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz CL550 Coupe (C216) Twin Turbo 4.7L V8 (M278)
2011 Mercedes-Benz CL550 Coupe (C216) Twin Turbo 4.7L V8 (M278)
2018 Mercedes-Benz CLS500 Shooting Brake (X218) Twin Turbo 4.7L V8 (M278)
2017 Mercedes-Benz CLS500 Shooting Brake (X218) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz CLS500 Shooting Brake (X218) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz CLS500 Shooting Brake (X218) Twin Turbo 4.7L V8 (M278)
2018 Mercedes-Benz CLS500 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2017 Mercedes-Benz CLS500 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz CLS500 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz CLS500 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz CLS500 Shooting Brake (X218) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz CLS500 Shooting Brake (X218) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz CLS500 Shooting Brake (X218) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz CLS500 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz CLS500 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz CLS500 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2011 Mercedes-Benz CLS500 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2018 Mercedes-Benz CLS550 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2017 Mercedes-Benz CLS550 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz CLS550 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz CLS550 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz CLS550 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz CLS550 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz CLS550 Coupe (C218) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz E550 Coupe (C207) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz E550 Coupe (C207) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz E550 Coupe (C207) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz E550 Coupe (C207) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz E550 Coupe (C207) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz E550 Base (W212) Twin Turbo 4.7L V8 (M278)
2015 Mercedes-Benz E550 Base (W212) Twin Turbo 4.7L V8 (M278)
2014 Mercedes-Benz E550 Base (W212) Twin Turbo 4.7L V8 (M278)
2013 Mercedes-Benz E550 Base (W212) Twin Turbo 4.7L V8 (M278)
2012 Mercedes-Benz E550 Base (W212) Twin Turbo 4.7L V8 (M278)
2016 Mercedes-Benz E63 AMG S 4Matic (W212) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz E63 AMG S 4Matic (W212) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz E63 AMG S 4Matic (W212) Twin Turbo 5.5L V8 (M157)
2013 Mercedes-Benz E63 AMG S 4Matic (W212) Twin Turbo 5.5L V8 (M157)
2018 Mercedes-Benz CLS63 AMG S 4MATIC (C218) Twin Turbo 5.5L V8 (M157)
2017 Mercedes-Benz CLS63 AMG S 4MATIC (C218) Twin Turbo 5.5L V8 (M157)
2016 Mercedes-Benz CLS63 AMG S 4MATIC (C218) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz CLS63 AMG S 4MATIC (C218) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz CLS63 AMG S 4MATIC (C218) Twin Turbo 5.5L V8 (M157)
2019 Mercedes-Benz SL63 AMG Roadster (R231) Twin Turbo 5.5L V8 (M157)
2018 Mercedes-Benz SL63 AMG Roadster (R231) Twin Turbo 5.5L V8 (M157)
2017 Mercedes-Benz SL63 AMG Roadster (R231) Twin Turbo 5.5L V8 (M157)
2016 Mercedes-Benz SL63 AMG Roadster (R231) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz SL63 AMG Roadster (R231) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz SL63 AMG Roadster (R231) Twin Turbo 5.5L V8 (M157)
2013 Mercedes-Benz SL63 AMG Roadster (R231) Twin Turbo 5.5L V8 (M157)
2012 Mercedes-Benz SL63 AMG Roadster (R231) Twin Turbo 5.5L V8 (M157)
2017 Mercedes-Benz S63 AMG Cabriolet (A217) Twin Turbo 5.5L V8 (M157)
2016 Mercedes-Benz S63 AMG Cabriolet (A217) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz S63 AMG Cabriolet (A217) Twin Turbo 5.5L V8 (M157)
2017 Mercedes-Benz S63 AMG Coupe (C217) Twin Turbo 5.5L V8 (M157)
2016 Mercedes-Benz S63 AMG Coupe (C217) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz S63 AMG Coupe (C217) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz S63 AMG Coupe (C217) Twin Turbo 5.5L V8 (M157)
2017 Mercedes-Benz S63 AMG Base (W222) Twin Turbo 5.5L V8 (M157)
2016 Mercedes-Benz S63 AMG Base (W222) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz S63 AMG Base (W222) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz S63 AMG Base (W222) Twin Turbo 5.5L V8 (M157)
2013 Mercedes-Benz S63 AMG Base (W221) Twin Turbo 5.5L V8 (M157)
2012 Mercedes-Benz S63 AMG Base (W221) Twin Turbo 5.5L V8 (M157)
2011 Mercedes-Benz S63 AMG Base (W221) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz CL63 AMG Coupe (C216) Twin Turbo 5.5L V8 (M157)
2013 Mercedes-Benz CL63 AMG Coupe (C216) Twin Turbo 5.5L V8 (M157)
2012 Mercedes-Benz CL63 AMG Coupe (C216) Twin Turbo 5.5L V8 (M157)
2011 Mercedes-Benz CL63 AMG Coupe (C216) Twin Turbo 5.5L V8 (M157)
2018 Mercedes-Benz CLS63 AMG Shooting Brake (X218) Twin Turbo 5.5L V8 (M157)
2017 Mercedes-Benz CLS63 AMG Shooting Brake (X218) Twin Turbo 5.5L V8 (M157)
2016 Mercedes-Benz CLS63 AMG Shooting Brake (X218) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz CLS63 AMG Shooting Brake (X218) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz CLS63 AMG Shooting Brake (X218) Twin Turbo 5.5L V8 (M157)
2013 Mercedes-Benz CLS63 AMG Shooting Brake (X218) Twin Turbo 5.5L V8 (M157)
2012 Mercedes-Benz CLS63 AMG Shooting Brake (X218) Twin Turbo 5.5L V8 (M157)
2011 Mercedes-Benz CLS63 AMG Shooting Brake (X218) Twin Turbo 5.5L V8 (M157)
2018 Mercedes-Benz CLS63 AMG Coupe (C218) Twin Turbo 5.5L V8 (M157)
2017 Mercedes-Benz CLS63 AMG Coupe (C218) Twin Turbo 5.5L V8 (M157)
2016 Mercedes-Benz CLS63 AMG Coupe (C218) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz CLS63 AMG Coupe (C218) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz CLS63 AMG Coupe (C218) Twin Turbo 5.5L V8 (M157)
2013 Mercedes-Benz CLS63 AMG Coupe (C218) Twin Turbo 5.5L V8 (M157)
2012 Mercedes-Benz CLS63 AMG Coupe (C218) Twin Turbo 5.5L V8 (M157)
2011 Mercedes-Benz CLS63 AMG Coupe (C218) Twin Turbo 5.5L V8 (M157)
2016 Mercedes-Benz E63 AMG Base (W212) Twin Turbo 5.5L V8 (M157)
2015 Mercedes-Benz E63 AMG Base (W212) Twin Turbo 5.5L V8 (M157)
2014 Mercedes-Benz E63 AMG Base (W212) Twin Turbo 5.5L V8 (M157)
2013 Mercedes-Benz E63 AMG Base (W212) Twin Turbo 5.5L V8 (M157)
2012 Mercedes-Benz E63 AMG Base (W212) Twin Turbo 5.5L V8 (M157)
