I picked up my CLS63 last week. I had a CLS55 that was Renntech'd out and knew they make good product and it works.

So gave them a call and they have an upgrade available....MONSTER HP AND TORQUE. Its also way more reasonable than the performance package only $3495 vs $7500.

So today my car saw our dyno for the baseline:


We use a mustang AWD-500 dyno, typically will show lower numbers than what you might see a dyno jet etc show.

The baseline numbers are in Horsepower 390 Torque 378 ft lbs.

Today the ecu will leave to Renntech overnight and we will see it back Thursday.

 

Full article about the ecu upgrade:

http://www.roadtesttv.com/hot-news-2012-mercedes-cls63

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.


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.


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.

 

in the article it said that stock the car put down 473.24 horsepower and 468.22 ft/lbs of torque at the wheels. are u saying that a mustang dyno reads 80whp and 90wtq lower?

 

Could be, i'm using our dyno sheet as a baseline. Typically we see about 20-25% drivetrain loss on our dyno/climate.

The end of the day what we are showing is we started out with this HP #, moved to this HP#.

 

Geez! Love those numbers with the Renntech tune!
Can't wait to see what your numbers will be like once you get your ECU back from them.

The numbers they claim just make the wait feel that much longer.

 

WOW

can't wait to see the results.

 

Still hate you for SEMA, but I can't wait to see the tune numbers!

 

So I have terrible news....

Renntech is sending me the ecu and I get it back tomorrow. I'm going to be out of town for two weeks though......ARRRGH!!!!

I wanted the ecu done so badly before I left


The shop will still post results though

 

Hey Rob,

What are your plans for more rubber at the back? I'm finding that my stock CLS63 non-PP could benefit from wider rubber right now, and that's before I've even started adding power.

Also, with CLS63 tunes - does it have to be an ECU swap, or can you purchase the software/flash and a cable like some other companies do for 997TT tunes?

I'm in Australia - would be painful being without the car while waiting for the ECU to be shipped to and from the states.

 

I'm sure you can get a 305 tire on the car with good offsets. Not sure other than that yet I'll get some pictures today from under the car to show how much room there is.

 

I hope the shop knows to post it here, in this thread.

Hopefully those two weeks are for pleasure and not work. Nevertheless, have a safe trip.

 

Hi Rob! Any dyno updates? The wait it makes me want to get a CLS63 w/o PP.

 

Update?

 

UPDATE??

 

Sorry guys, I moved the data over to another thread that Renntech had up and neglected mine.

Here is the dyno sheet and shows the gains on our 91 octane fuel

104hp at the wheels and 125ft lbs. Besides the raw power now the car just feels better in the mid range. The one issue now is not keeping my foot in it.





The truth of it is I couldn't lay into it at all because with 1000lbs of weight over the axles(4 100lb weights & 2 300lb guys in the back seats) I keep just breaking the tires loose on the dyno.

This is the best it got and this is me gently laying into it at 3500rpm. I need to find a Dynapack dyno.

Praise to Renntech, this is tire shredding fun and for $3500 completely changed the car.

 

is that why the stock tune has higher hp and tq in the low rpm range???

 

Yes sir, full throttle just started to smoke the rear tires. Yes fun for a second but bad for getting good dyno results.

 

Interesting. I'm getting mine Renntech'd next week and I'll post the before/after dyno. What is the boost up to w/ the tune? Does it remove the speed limiter (I have non PP)?

 

amazing results!

It doesn't matter where the number start. As long as you have somewhere to start with and the end result (Of course granted everything is fine on the car). That'll give you gains you're looking for as per the mods.

Absolutely ridiculous numbers!

 

WOW

that is truley amazing and a beast.

 

Thanks guys. Spoke with renntech they are working on a differential for the new TT cars. Hopefully will be released soon.

 

if we're upgrading the CPU on a car that has the performance package does that mean that everything gets wiped and i wasted 7500 on the package upgrade or can i get better gains then cars without that package?

 

The final numbers (hp relatively speaking) will be the same because the tune maximizes the boost to the same number with or without the PP. So if you have a PP car and get a tune, yes it would equal to the non PP car with a tune. But you keep the stiffer suspension and the other items the non PP car doesnt get.

 

Wow I want. Must have more power!!! Great results.

 

Anyone know if we can order an extra ECU to have this done on so we can have a stock ECU for trips to the dealer and a modded ECU for running around?