RENNtech: Engineering Superiority and Ultimate Performance for Mercedes-AMG
When AMG factory power isn't enough, and exclusivity without sacrifice is required, RENNtech takes the lead. Founded in 1989 by Hartmut Feyhl (former Technical Director at AMG North America), the company doesn't just "add horsepower"—it re-engineers the vehicle. In 2026, RENNtech remains the foremost authority in Mercedes tuning, delivering reliability and staggering performance tested on global circuits and open highways.
ATOMIC-SHOP Ukraine is the official RENNtech partner. We provide the full upgrade spectrum: from HHT plug-and-play software to extreme turbo kits and functional dry-carbon aerodynamics.
The 2026 Sledgehammer: A Masterpiece in Restomodding
RENNtech's most ambitious project to date is the SEC V12 Sledgehammer, a reimagined C126 coupe sharing its heart with hypercar royalty.
- 7.5L V12 Powerplant: Based on the legendary M120, this bored-and-stroked engine produces a naturally aspirated 660 HP and 650 lb-ft of torque.
- Symphonic Exhaust: Custom equal-length headers engineered to provide a high-pitched, V12 "F1-style" soundtrack.
- Aerodynamic Widebody: Hand-crafted panels that improve high-speed stability and brake cooling while paying homage to the 80s "Hammer" legacy.
Comparative Table: Stock AMG vs. RENNtech Performance
| Model / Parameter | Stock Figures | RENNtech Enhanced |
|---|---|---|
| AMG GT 63 S (X290) | 630 HP / 664 LB-FT | 783 HP / 798 LB-FT |
| 0–100 km/h (GT 63 S) | 3.2 sec | 2.8 sec |
| Ride Height Control | Factory Presets | HSM Module — 1mm precise corner adjustment |
| Daily Reliability | Standard | Unaltered drivability with OEM safety protocols |
FAQ: ATOMIC-SHOP Technical Expertise on RENNtech
Is it safe to use RENNtech tuning with local fuel quality?
RENNtech develops software considering various fuel quality standards. For the Ukrainian market, we calibrate the settings specifically for 98/100 octane fuel. The system retains all OEM safety protocols (knock sensors, EGT protection), ensuring the engine remains protected even under extreme loads.
What are HSM modules and how do they work?
HSM stands for Hand-Held Suspension Modules. Using a PC or a mobile app, you can adjust the height of each air strut individually with 1mm precision. This is the perfect solution for achieving a show-ready "Stance" or fine-tuning weight distribution before a track day.
Does RENNtech tuning affect daily drivability and comfort?
This is the brand's core strength. Even with an output of 800+ hp, the vehicle behaves like a stock Mercedes in heavy traffic: smooth gear shifts, quiet idling, and full retention of all factory comfort features.