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Dyno mode engaged, traction control off and the glory of Renntech is enjoyed

[dropcap style=”style1″]M[/dropcap]ercedes­Benz has designed its 2013 SL­63 AMG 5.5 liter twin turbo to a standard fit of it’s price, but insert RENNtech and what you have on your hands is something a bit more than your usual luxury automobile.  Installed and tested by Goodspeed Performance in Scottsdale Arizona, the twin turbo kit modified, fabricated, and offered by RENNtech puts power and pressure on the OEM design.

While utilizing OEM locations and fitment sizes, RENNtech reuses the OEM turbo housings and modifies them by using motorsport derived ball bearing turbochargers from Turbo by Garrett.  In order to repurpose the turbo housings to fit the larger internal cartridge, both the housing and impeller must be CNC machined in house to RENNtech spec.  RENNtech doesn’t share their exact design or modification specifications to the public, but the overall dyno numbers are enough to understand the benefit of their product.

Goodspeed Merc BuildThe increase in power requires an increase in the bottom end strength.  RENNtech also had a part in building the planetary gear style transmission internals to be strong enough to handle the increase of power.  Goodspeed also installed a Wavetrac limited slip differential that required a 6mm shaving of the inside of the differential casing in order for it to fit.  No structural issues are to be expected from this change and the need for this is highly common.

Matthew Garrett, a technician at Goodspeed Performance that performed the majority of the install, stated that the overall install took 16 hours with a four week down time during which the transmission was sent out to be modified by RENNtech.  Matthew also stated that the install was “quite abnormally easy to do.”   After removing just a couple of plugs and separate the control arms from the subframe, the subframe comes down from the car and because the kit does not require any sort of in house placement modifications it was all plug and play.

Goodspeed has yet to dyno the SL­63, but expects numbers around 800 torque.

For those of you not familiar with RENNtech, it was established by Hartmut Feyhl in 1989 and supplies everything from a shift knob to a complete car, including the 200 mph Renntech E7.4RS, the fastest sedan in the world in 1996.  Feyhl who spent 12 years at AMG before branching out to start RENNtech, is regarded as the USA’s foremost authority on Mercedes tuning.  Even though RENNtech is the prominent Mercedes specialists, recently they have started to offer products for brands such as: Audi, Porsche and Volkswagen.

Photography by Rebecca Nguyen

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