ABOUT US
RENNtech has become the premier Mercedes-Benz specialist and Hartmut Feyhl himself is regarded by many as USA’s foremost authority in Mercedes tuning.
His vast experience comes from 12 years spent at AMG Germany before serving as the North American division’s Technical Director. Prior to the tuning company’s merger with Mercedes-Benz in 1989, by the request of AMG Germany, Feyhl branched out on his own to start RENNtech and service the existing AMG North America customers.
Performance without compromise. This is the foundation upon which we have built our reputation. Established in 1989 by Hartmut Feyhl, RENNtech has evolved and grown from servicing AMG’s customers into the foremost authority on tuning and customizing AMGs and Mercedes-Benz. RENNtech also offers tuning solutions for Porsche, Audi and Bentley vehicles, along with other European luxury cars. Over the years, we have developed high-performance products for virtually all Mercedes-Benz AMG vehicles. Some of the most notable among these are the 200 mph RENNtech E7.4RS (which claimed ‘Fastest Sedan in the World’ honors by Car and Driver Magazine in 1996) and the most recent 1200 HP Mercedes-AMG GT63 RIIIx. Each of these vehicles are just a sampling of what RENNtech has achieved, featuring extreme performance, upgraded aesthetics and a fit and finish that rivals factory vehicles.
Frequently asked questions
Is the ECU upgrade really as simple as unplugging the stock ECU and plugging in the RENNtech tuned ECU?
Yes! Our ECU upgrades are designed to be plug and play requiring little more than removal of the stock unit and replacement of the ECU when it is returned to you from RENNtech. The ECU connectors are easy to remove and install and their location cannot be confused. Each connector is unique and only fits on its designated counterpart.
Live technical support is also available to support you should you have any additional question or require assistance during the process. Support is available M-F 9am–6pm EST at (561)-845-7888
Will the RENNtech ECU remove the top speed limiter?
Our ECU program will increase the vehicles top speed to the MB recommended top speed based upon the tire rating for the vehicle. This is to ensure safe operating conditions and that the vehicle maximum speed does not go beyond that of performance DOT tire ratings.
Why does the Manufacturer not program the OEM ECU as your unit is programmed?
There are many reasons why the factory ECU is not programmed the same way in which we program our units. Manufacturers tunes are predominantly geared to many different important factors with performance becoming a consideration only after a multitude of other requirements are met.
The factory tunes their ECU’s to meet a wide variety of day to day driving conditions where fuel economy, emissions and local government regulations all play a part in deciding how the engine will perform in your specific vehicle. Other factors also include
Insurance regulations in certain countries such as Europe
High speed driving
Catalytic converter Protection
Fuel grade and quality available in select markets
Drivability in a wide array of conditions, altitudes and climates
Company marketing strategies
Positioning of a specific model against the competition
Positioning of a model within the companies own model line up
Many manufactures also design a power train to work on multiple vehicle platforms across their production line. For example, the Mercedes M157 engine (In 63 non turbo AMG vehicles) is found in ALL 63 series such as the C class, S, CL, CLS,E,ML,R and so on. Each of these models may have the same engine, yet has been tuned based on the vehicles unique characteristics with performance being a factory only after the majority of these requirements have been fulfilled.
RENNtech ECU tunes certainly take into account all the things the factory compensates for, but brings performance to the forefront of the equation. Our proprietary ECU tunes have been developed and rigorously tested in house for maximum performance, compatibility and reliability ensuring you have maximum performance when you want it, but retain the comfort of a daily driver when you don’t need it.
Our remapping optimizes performance by modifying the ignition timing, throttle mapping, fuel curves and air/fuel ratios. We also modify boost mapping on turbo charged vehicles as well as increase the rev limiter and the top speed governor; all of which brings out the true potential hidden within you vehicle. Our modifications do not override any of the vehicles safety functions, nor does it interfere with any built in protection features from the factory so you can rest assured your performance tune will provide you with years of trouble free enjoyment.