Hot News! 2012 Mercedes CLS63 AMG DYNO TEST!! Over 660 horsepower and 730 ft/lbs of torque with a RENNtech tune!!! Road Test TV

October 4th, 2011 by Road Test TV

RENNtech, one of the premiere Mercedes tuners in the world, recently strapped a new 2012 Mercedes CLS63 V8 BiTurbo to their dyno and the results are impressive.  For background, Mercedes Benz has dropped the CLS63′s naturally aspirated 6.2 liter V8 engine (rated at 507 hp and 465 lb-ft) that debuted in 2007 in favor of a smaller 5.5 liter BiTurbo V8.   Although the outgoing 6.2 was a high winder, we longed for the torque of the 5.4 liter Kompressor motor (E55, S55, SL55, CL55) the 6.2 replaced.

Well, our performance prayers have been answered.  The new direct injected BiTurbo V8 is STRONG as the dyno result below confirm.   The base 5.5 liter V8 Bi turbo is rated at 518 horsepower and 516 pound-feet of torque at the crank.   AMG offers a “Performance Package” for those who want more.  The “Performance Package” raises the boost on the turbos from 14.5 psi to 18.8 psi.  As a result, horsepower jumps from 518 to 550 and torque from 516 lb-ft to 590 (dyno graph below).

Mercedes is generally conservative with its power figures, and the dyno numbers confirm that they did it again with the new CLS63.  On a Dynojet dynamometer at RENNtech, the new 5.5 liter V8 BiTurbo in base form made 556 horsepower and 550 ft-lbs of torque (473.24 horsepower and 468.22 ft/lbs of torque at the wheels).  Note, this was the base CLS63 that is rated at 518 hp and 516 ft/lbs of torque.  In sum, the new CLS63 made approximately 40 horsepower and 40 ft/lbs of torque more than the factory claims.   But hold on, this motor makes some serious power with a RENNtech tune.   Hartmut Feyhl and his team at RENNtech have spent untold man hours doing research and development on the new 5.5 liter BiTurbo. As a result, they have developed a tune that is nothing short of astonishing.  With a tune only, the same 2012 CLS63 made 669 horsepower and 734 ft-lbs of torque (569.13 horsepower and 624.94 ft/lbs of torque at the wheels).  That, my friends, is huge power.   The CLS63 power numbers with RENNtech’s proprietary tune are in the territory of Mercedes’ $300,000 V12 BiTurbo SL65 Black Series.

2012 Mercedes CLS63 AMG Dyno Test Graph - Road Test TV

2012 Mercedes CLS63 AMG Dyno Graph - Road Test TV

According to Mercedes, the new 2012 CLS63 equipped with AMG’s seven-speed “Speedshift” MCT transmission will rip from 0 – 60 mph in 4.4 seconds with the lower boost motor. The “AMG Performance Package” cuts a tenth and gets to 60 mph in 4.3 seconds.  Top speed also goes up from 155 to 186 mph with the AMG Performance Package.  We believe these numbers are conservative as well since we are aware that the 2012 CLS63 will run the quarter mile (stock) in 12.0 at 122 mph.

With the RENNtech modifications pushing the power to almost 670 horsepower and 740 ft/lbs of torque, it is safe to assume that the new CLS63 will run the quarter mile in the low 11s at close to 130 mph.  As soon as we can get the new CLS63 to the drag strip, we’ll post the performance results.

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